You should read the following discussion and analysis of our financial condition
and results of operations together with the unaudited consolidated financial
statements and related notes included elsewhere in this Quarterly Report on Form
10-Q. This discussion contains forward-looking statements that involve risks and
uncertainties. Our actual results could differ materially from those discussed
below. Factors that could cause or contribute to such differences include those
identified below and those discussed in the section titled "Risk Factors"
included elsewhere in this Quarterly Report on Form 10-Q.

Overview

Sunrun's mission is to provide our customers with clean, affordable solar energy
and storage, and a best-in-class customer experience. In 2007, we pioneered the
residential solar service model, creating a low-cost solution for customers
seeking to lower their energy bills. By removing the high initial cost and
complexity of cash system sales that used to define the residential solar
industry, we have fostered the industry's rapid growth and exposed an enormous
market opportunity. Our relentless drive to increase the accessibility of solar
energy is fueled by our enduring vision: to create a planet run by the sun.

On October 8, 2020, we completed the acquisition of Vivint Solar, Inc. ("Vivint
Solar") a leading full-service residential solar provider in the United States,
at an estimated purchase price of $5.0 billion, pursuant to an Agreement and
Plan of Merger, dated as of July 6, 2020, by and among Sunrun, Vivint Solar and
Viking Merger Sub, Inc., a Delaware corporation and direct wholly owned
subsidiary of the Company ("Merger Sub"). Further information about the
acquisition of Vivint Solar can be found in Note 18, Acquisitions, to our
consolidated financial statements included elsewhere in this Quarterly Report on
Form 10-Q.

We are engaged in the design, development, installation, sale, ownership and
maintenance of residential solar energy systems ("Projects") in the United
States. We provide clean, solar energy typically at savings compared to
traditional utility energy. Our primary customers are residential homeowners. We
also offer battery storage along with solar energy systems to our customers in
select markets and sell our services to certain commercial developers through
our multi-family and new homes offerings. After inventing the residential solar
service model and recognizing its enormous market potential, we have built the
infrastructure and capabilities necessary to rapidly acquire and serve customers
in a low-cost and scalable manner. Today, our scalable operating platform
provides us with a number of unique advantages. First, we are able to drive
distribution by marketing our solar service offerings through multiple channels,
including our diverse partner network and direct-to-consumer operations. This
multi-channel model supports broad sales and installation capabilities, which
together allow us to achieve capital-efficient growth. Second, we are able to
provide differentiated solutions to our customers that, combined with a great
customer experience, we believe will drive meaningful margin advantages for us
over the long term as we strive to create the industry's most valuable and
satisfied customer base.

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Our core solar service offerings are provided through our lease and power
purchase agreements, which we refer to as our "Customer Agreements" and which
provide customers with simple, predictable pricing for solar energy that is
insulated from rising retail electricity prices. While customers have the option
to purchase a solar energy system outright from us, most of our customers choose
to buy solar as a service from us through our Customer Agreements without the
significant upfront investment of purchasing a solar energy system. With our
solar service offerings, we install solar energy systems on our customers' homes
and provide them the solar power produced by those systems for typically a 20-
or 25-year initial term. In addition, we monitor, maintain and insure the system
during the term of the contract. In exchange, we receive predictable cash flows
from high credit quality customers and qualify for tax and other benefits. We
finance portions of these tax benefits and cash flows through tax equity,
non-recourse debt and project equity structures in order to fund our upfront
costs, overhead and growth investments. We develop valuable customer
relationships that can extend beyond this initial contract term and provide us
an opportunity to offer additional services in the future, such as our home
battery storage service. Since our founding, we have continued to invest in a
platform of services and tools to enable large scale operations for us and our
partner network, and these partners include solar integrators, sales partners,
installation partners and other strategic partners. The platform includes
processes and software, as well as fulfillment and acquisition of marketing
leads. We believe our platform empowers new market entrants and smaller industry
participants to profitably serve our large and underpenetrated market without
making the significant investments in technology and infrastructure required to
compete effectively against established industry players. Our platform provides
the support for our multi-channel model, which drives broad customer reach and
capital-efficient growth.
Delivering a differentiated customer experience is core to our strategy. We
emphasize a customized solution, including a design specific to each customer's
home and pricing configurations that typically drive both customer savings and
value to us. We believe that our passion for engaging our customers, developing
a trusted brand, and providing a customized solar service offering resonates
with our customers who are accustomed to a traditional residential power market
that is often overpriced and lacking in customer choice.
We have experienced substantial growth in our business and operations since our
inception in 2007, as well as through our acquisition of Vivint Solar in 2020.
As of September 30, 2021, we operated the largest fleet of residential solar
energy systems in the United States. We have a Networked Solar Energy Capacity
of 4,457 Megawatts as of September 30, 2021, which represents the aggregate
megawatt production capacity of our solar energy systems that have been
recognized as deployments, from our inception through the measurement date.
Gross Earning Assets as of September 30, 2021 were approximately $9.2 billion.
Please see the section entitled "Key Operating Metrics" for more details on how
we calculate Networked Solar Energy Capacity and Gross Earning Assets.
We also have a long track record of attracting low-cost capital from diverse
sources, including tax equity and debt investors. Since inception we have raised
tax equity investment funds to finance the installation of solar energy systems.
The Opportunity of Home Electrification and a Clean, Resilient Grid
The United States is on the precipice of a once-in-a-generation transformation
of our energy system. The decarbonization of the American economy will require
powering our energy supply - including our homes, appliances and automobiles -
with clean energy. Sunrun's next goal and chapter of growth is to be the go-to
company for clean and reliable home electrification--providing our customers
with affordable renewable energy throughout their homes and our communities with
a cleaner, more resilient grid.
We intend to pursue these opportunities on a variety of fronts. For instance, in
May 2020, we announced a partnership with Ford Motor Company to be the preferred
installer for Ford's Charge Station Pro and Intelligent Backup Power System,
debuting with the all-electric F-150 Lightning. Under the partnership, we are
co-developing Ford's Home Integration System, including the bi-directional
inverter, which enables the F-150 Lightning to serve as a reliable home backup
energy source by powering the home during an outage event. Through this
partnership, customers in participating markets will also be provided with the
opportunity to install a solar and battery system on their home, enabling them
to power their household with clean, affordable energy and charge their truck
with the power of the sun.
                                       40
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We also continue to pursue the development of our grid services business,
creating virtual power plants that lead to a cleaner, more resilient grid. In
collaboration with grid managers, we can deploy our battery systems where they
will add the most value for utilities, the grid, and customers. We are actively
delivering demand response and capacity services to meet operational needs in
multiple geographies, and partnering with grid managers to build a more
resilient electricity system that integrates the new energy technologies
customers want.
We believe the electrification of U.S. households with renewable energy, and the
accompanying development of an inter-connected, smart grid will provide a number
of market opportunities beyond our traditional solar and battery storage
offerings, including EV chargers, battery retrofits, re-powered or expanding
systems, home energy management services, and other home electrification
products. Additionally, we believe our omni-channel model and geographic reach
provides us with the capabilities to execute on these opportunities in a variety
of markets.
To further expand such future upsell and retrofit opportunities, from time to
time, we may pursue acquisitions of previously installed solar systems. While we
do not expect such acquisitions to represent a material portion of our growth on
an annual basis, we plan to pursue such transactions opportunistically. For
instance, in the third quarter, we completed a strategic transaction that added
approximately 2,000 Customers and 13 MW of Networked Solar Energy Capacity.
In sum, we believe the electrification of the U.S. economy with renewable energy
presents an unprecedented economic opportunity, as well as our country's best
path to achieving net zero emissions by 2050. Through these electrification
opportunities and our grid services business, we aim to be the consumer brand
synonymous with repowering our customers' homes with renewable energy and
providing a pathway to a cleaner, healthier future.
Impacts of COVID-19 on Our Business
The COVID-19 pandemic and the resulting impact on the U.S. economy have
accelerated many of our operational initiatives to deliver best-in-class
customer value and to reduce costs. We have invested in technology to streamline
our installation processes, including online permitting and interconnection in
many locations, enabled our entire salesforce to complete sales consultations in
a virtual setting, and employed extensive use of drone technology to complete
rooftop surveys. We believe this transition towards a digital model for many
sales channels will position us well to realize sustaining reductions in
customer acquisition costs.
The COVID-19 pandemic has had an unprecedented impact on the U.S. economy,
resulting in governments and organizations implementing public health measures
in an effort to contain the virus, including physical distancing, work from
home, supply chain logistical changes and closure of non-essential businesses.
With vaccine administration and adoption rising, governments and organizations
have responded by adjusting such restrictions and guidelines accordingly. We are
monitoring this fluid situation and will continue to follow official regulations
to protect our employees and customers.
The ultimate impact of the COVID-19 pandemic (and virus variants) is still
highly uncertain and subject to change, and we do not yet know the full extent
of potential delays or impacts on our business, operations or the global economy
as a whole. We will continue to monitor developments affecting our workforce,
our customers, and our business operations generally and will take actions that
we determine are necessary in order to mitigate these impacts.


Investment Funds
Our Customer Agreements provide for recurring customer payments, typically over
20 or 25 years, and the related solar energy systems are generally eligible for
Commercial ITCs, accelerated tax depreciation and other government or utility
incentives. Our financing strategy is to monetize these benefits at a low
weighted average cost of capital. This low cost of capital enables us to offer
attractive pricing to our customers for the energy generated by the solar energy
system on their homes. Historically, we have monetized a portion of the value
created by our Customer Agreements and the related solar energy systems through
investment funds. These assets are attractive to fund investors due to the
long-term, recurring nature of the cash flows generated by our Customer
Agreements, the high credit scores of our customers, the fact that energy is a
non-discretionary good and our low loss rates. In
                                       41
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addition, fund investors can receive attractive after-tax returns from our
investment funds due to their ability to utilize Commercial ITCs, accelerated
depreciation and certain government or utility incentives associated with the
funds' ownership of solar energy systems.
As of September 30, 2021, we had 60 active investment funds, which are described
below. We have established different types of investment funds to implement our
asset monetization strategy. Depending on the nature of the investment fund,
cash may be contributed to the investment fund by the investor upfront or in
stages based on milestones associated with the design, construction or
interconnection status of the solar energy systems. The cash contributed by the
fund investor is used by the investment fund to purchase solar energy systems.
The investment funds either own or enter into a master lease with a Sunrun
subsidiary for the solar energy systems, Customer Agreements and associated
incentives. We receive on-going cash distributions from the investment funds
representing a portion of the monthly customer payments received. We use the
upfront cash, as well as on-going distributions to cover our costs associated
with designing, purchasing and installing the solar energy systems. In addition,
we also use debt, equity and other financing strategies to fund our operations.
The allocation of the economic benefits between us and the fund investor and the
corresponding accounting treatment varies depending on the structure of the
investment fund.
We currently utilize three legal structures in our investment funds, which we
refer to as: (i) pass-through financing obligations, (ii) partnership flips and
(iii) joint venture ("JV") inverted leases. We reflect pass-through financing
obligations on our consolidated balance sheet as a pass-through financing
obligation. We record the investor's interest in partnership flips or JV
inverted leases (which we define collectively as "consolidated joint ventures")
as noncontrolling interests or redeemable noncontrolling interests. These
consolidated joint ventures are usually redeemable at our option and, in certain
cases, at the investor's option. If redemption is at our option or the
consolidated joint ventures are not redeemable, we record the investor's
interest as a noncontrolling interest and account for the interest using the
hypothetical liquidation at book value ("HLBV") method. If the investor has the
option to put their interest to us, we record the investor's interest as a
redeemable noncontrolling interest at the greater of the HLBV and the redemption
value.
The table below provides an overview of our current investment funds (dollars in
millions):
                                                                                     Consolidated Joint Ventures
                                                      Pass-Through
                                                        Financing
                                                       Obligations            Partnership Flip          JV Inverted Lease
Consolidation                                       Owner entity            Single entity,             Owner and tenant
                                                    consolidated,           consolidated               entities
                                                    tenant entity not                                  consolidated
                                                    consolidated
Balance sheet classification                        Pass-through            Redeemable                 Redeemable
                                                    financing               noncontrolling             noncontrolling
                                                    obligation              interests and              interests and
                                                                            noncontrolling             noncontrolling
                                                                            interests                  interests
Revenue from Commercial ITCs                        Recognized on the       None                       None
                                                    permission to
                                                    operate ("PTO")
                                                    date
Method of calculating investor interest             Effective               Greater of HLBV or         Greater of HLBV or
                                                    interest rate           redemption value; or       redemption value;
                                                    method                  pro rata                   or pro rata

Liability balance as of September 30, 2021 $ 323.9

                  N/A                       N/A
Noncontrolling interest balance (redeemable                       N/A       $         1,295.9          $           19.5

or otherwise) as of September 30, 2021





For further information regarding our investment funds, including the associated
risks, see Part II, Item 1A. Risk Factors- "Our ability to provide our solar
service offerings to customers on an economically viable basis depends in part
on our ability to finance these systems with fund investors who seek particular
tax and other benefits", as well as Note 10, Pass-through Financing Obligations,
Note 11, VIE Arrangements and Note 12, Redeemable Noncontrolling Interests and
Equity to our consolidated financial statements appearing elsewhere in this
Quarterly Report on Form 10-Q.
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Key Operating Metrics
We regularly review a number of metrics, including the following key operating
metrics, to evaluate our business, measure our performance, identify trends
affecting our business, formulate financial projections and make strategic
decisions. Some of our key operating metrics are estimates that are based on our
management's beliefs and assumptions and on information currently available to
management. Although we believe that we have a reasonable basis for each of
these estimates, we caution you that these estimates are based on a combination
of assumptions that may prove to be inaccurate over time. Any inaccuracies could
be material to our actual results when compared to our calculations. Please see
the section titled "Risk Factors" in this Quarterly Report on Form 10-Q for more
information. Furthermore, other companies may calculate these metrics
differently than we do now or in the future, which would reduce their usefulness
as a comparative measure.

•Networked Solar Energy Capacity represents the aggregate megawatt production
capacity of our solar energy systems, whether sold directly to customers or
subject to executed Customer Agreements (i) for which we have confirmation that
the systems are installed on the roof, subject to final inspection; (ii) in the
case of certain system installations by our partners, for which we have accrued
at least 80% of the expected project cost (inclusive of acquisitions of
installed systems), or (iii) for multi-family and any other systems that have
reached NTP, measured on the percentage of the project that has been completed
based on expected project cost. Systems that have met this criteria are
considered to be deployed.

•Gross Earning Assets is calculated as Gross Earning Assets Contracted Period plus Gross Earning Assets Renewal Period.



•Gross Earning Assets Contracted Period represents the present value of the
remaining net cash flows (discounted at 5%) during the initial term of our
Customer Agreements as of the measurement date. It is calculated as the present
value of cash flows (discounted at 5%) we expect to receive from Subscribers in
future periods, after deducting expected operating and maintenance costs,
equipment replacements costs, distributions to tax equity partners in
consolidated joint venture partnership flip structures, and distributions to
project equity investors. We include cash flows we expect to receive in future
periods from state incentive and rebate programs, contracted sales of solar
renewable energy credits, and awarded net cash flows from grid service programs
with utility or grid operators.

•Gross Earning Assets Renewal Period is the forecasted net present value we
would receive upon or following the expiration of the initial Customer Agreement
term but before the 30th anniversary of the system's activation (either in the
form of cash payments during any applicable renewal period or a system purchase
at the end of the initial term), for Subscribers as of the measurement date. We
calculate the Gross Earning Assets Renewal Period amount at the expiration of
the initial contract term assuming either a system purchase or a renewal,
forecasting only a 30-year customer relationship (although the customer may
renew for additional years, or purchase the system), at a contract rate equal to
90% of the customer's contractual rate in effect at the end of the initial
contract term. After the initial contract term, our Customer Agreements
typically automatically renew on an annual basis and the rate is initially set
at up to a 10% discount to then-prevailing utility power prices.

•Subscribers represent the cumulative number of Customer Agreements for systems that have been recognized as deployments through the measurement date.

•Customers represent the cumulative number of deployments, from our inception through the measurement date.



Gross Earning Assets is forecasted as of a specific date. It is forward-looking,
and we use judgment in developing the assumptions used to calculate it. Factors
that could impact Gross Earning Assets include, but are not limited to, customer
payment defaults, or declines in utility rates or early termination of a
contract in certain circumstances, including prior to installation.

The definitions of Gross Earning Assets, Gross Earning Assets Contracted Period,
and Gross Earning Assets Renewal Period use a discount rate of 5%; whereas the
definitions used in our periodic reports prior to December 31, 2020 used a
discount rate of 6%.
                                       43
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                                                        As of September 30,
                                                    2021

2020


Networked Solar Energy Capacity (megawatts)         4,457                  2,272
Customers                                          630,441                316,056


                                                 As of September 30,
                                                2021             2020

                                                    (in thousands)

Gross Earning Assets Contracted Period $ 6,229,446 $ 2,995,930 Gross Earning Assets Renewal Period

           2,928,806        1,542,472
Gross Earning Assets                        $ 9,158,252      $ 4,538,402



As a result of the acquisition of Vivint Solar in October 2020, we added $2.9
billion of Gross Earning Assets, of which $2.0 billion related to Gross Earning
Assets Contracted Period and $0.9 billion related to Gross Earning Assets
Renewal Period.
The tables below provide a range of Gross Earning Asset amounts if different
default, discount and purchase and renewal assumptions were used.
Gross Earning Assets Contracted Period:
                                              As of September 30, 2021
                                                    Discount rate
Default rate           3%               4%               5%               6%               7%

                                                   (in thousands)
5%                $ 7,203,404      $ 6,591,089      $ 6,056,424      $ 5,587,671      $ 5,175,083
0%                $ 7,420,557      $ 6,784,533      $ 6,229,446      $ 5,743,033      $ 5,315,117

Gross Earning Assets Renewal Period:


                                                          As of September 30, 2021
                                                                Discount rate
Purchase or Renewal rate           3%               4%               5%               6%               7%

                                                               (in thousands)
80%                           $ 3,802,291      $ 3,102,519      $ 2,540,942      $ 2,088,637      $ 1,723,049
90%                           $ 4,381,633      $ 3,575,687      $ 2,928,806      $ 2,407,715      $ 1,986,459
100%                          $ 4,960,974      $ 4,048,853      $ 3,316,669      $ 2,726,792      $ 2,249,868

Total Gross Earning Assets:


                                                                             As of September 30, 2021
                                                                                  Discount rate
Purchase or Renewal rate                     3%                    4%                    5%                   6%                   7%

                                                                                  (in thousands)
80%                                    $ 11,222,848          $  9,887,052          $ 8,770,387          $ 7,831,670          $ 7,038,166
90%                                    $ 11,802,190          $ 10,360,219          $ 9,158,252          $ 8,150,748          $ 7,301,577
100%                                   $ 12,381,531          $ 10,833,386          $ 9,546,115          $ 8,469,825          $ 7,564,986



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Critical Accounting Policies and Estimates



Our discussion and analysis of our financial condition and results of operations
are based upon our financial statements, which have been prepared in accordance
with generally accepted accounting principles in the United States ("GAAP").
GAAP requires us to make estimates and assumptions that affect the reported
amounts of assets, liabilities, revenue, expenses and related disclosures. We
base our estimates on historical experience and on various other assumptions
that we believe to be reasonable under the circumstances. In many instances, we
could have reasonably used different accounting estimates, and in other
instances, changes in the accounting estimates are reasonably likely to occur
from period to period. Actual results could differ significantly from our
estimates. Our future financial statements will be affected to the extent that
our actual results materially differ from these estimates. For further
information on all of our significant accounting policies, see Note 2, Summary
of Significant Accounting Policies of our annual report on Form 10-K for the
year ended December 31, 2020.

We believe that policies associated with our principles of consolidation,
revenue recognition, goodwill, impairment of long-lived assets, provision for
income taxes, business combinations and calculation of noncontrolling interests
and redeemable noncontrolling interests have the greatest impact on our
consolidated financial statements. Therefore, we consider these to be our
critical accounting policies and estimates.

Results of Operations


                                       45
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The results of operations presented below should be reviewed in conjunction with
the consolidated financial statements and notes thereto included elsewhere in
this Quarterly Report on Form 10-Q.
                                              Three Months Ended September 30,                 Nine Months Ended September 30,
                                                 2021                    2020                    2021                    2020

                                                                   (in thousands, except per share data)
Revenue:
Customer agreements and incentives       $         231,869          $    114,485          $        625,939          $    319,704
Solar energy systems and product
sales                                              206,896                95,275                   548,786               282,081
Total revenue                                      438,765               209,760                 1,174,725               601,785
Operating expenses:
Cost of customer agreements and
incentives                                         174,457                77,350                   512,073               239,049
Cost of solar energy systems and
product sales                                      172,538                75,679                   458,208               231,023
Sales and marketing                                171,462                70,720                   442,174               210,691
Research and development                             5,602                 5,205                    16,624                14,222
General and administrative                          51,290                41,829                   199,836               111,659
Amortization of intangible assets                    1,341                 1,167                     4,029                 3,817
Total operating expenses                           576,690               271,950                 1,632,944               810,461
Loss from operations                              (137,925)              (62,190)                 (458,219)             (208,676)
Interest expense, net                              (89,096)              (51,368)                 (238,365)             (152,013)
Other (expenses) income, net                        (4,332)                  864                    18,462                   766
Loss before income taxes                          (231,353)             (112,694)                 (678,122)             (359,923)
Income tax benefit (expense)                         9,980               (27,293)                  (19,058)              (30,424)
Net loss                                          (241,333)              (85,401)                 (659,064)             (329,499)
Net loss attributable to
noncontrolling interests and
redeemable noncontrolling
interests                                         (265,462)             (122,848)                 (618,160)             (325,425)
Net income (loss) attributable to
common stockholders                      $          24,129          $     37,447          $        (40,904)         $     (4,074)
Net income (loss) per share
attributable to common
stockholders
Basic                                    $            0.12          $       0.30          $          (0.20)         $      (0.03)
Diluted                                  $            0.11          $       0.28          $          (0.20)         $      (0.03)
Weighted average shares used to
compute income (loss) per share
attributable to common
stockholders
Basic                                              206,103               125,003                   204,355               121,813
Diluted                                            213,016               134,548                   204,355               121,813



                                       46

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Comparison of the Three Months Ended September 30, 2021 and 2020
Revenue
                                               Three Months Ended September 30,                        Change
                                                  2021                    2020                  $                  %

                                                                 (in thousands)
Customer agreements                       $         194,924          $    102,213          $  92,711                 91  %
Incentives                                           36,945                12,272             24,673                201  %
Customer agreements and incentives                  231,869               114,485            117,384                103  %

Solar energy systems                                127,936                52,238             75,698                145  %
Products                                             78,960                43,037             35,923                 83  %
Solar energy systems and product
sales                                               206,896                95,275            111,621                117  %
Total revenue                             $         438,765          $    209,760          $ 229,005                109  %


Customer Agreements and Incentives. The $92.7 million increase in revenue from
Customer Agreements was primarily due to both an increase in solar energy
systems under Customer Agreements being added to our fleet upon the acquisition
of Vivint Solar in October 2020, as well as new systems placed in service in the
period from October 1, 2020 through September 30, 2021, plus a full quarter of
revenue recognized in the third quarter of 2021 for systems placed in service in
the third quarter of 2020 versus only a partial quarter of such revenue related
to the period in which the assets were in service in 2020. Revenue from
incentives primarily consists of sales of SRECs, which increased by $24.7
million during the three months ended September 30, 2021, compared to the prior
year, due to the timing of sales and market conditions.
Solar Energy Systems and Product Sales. Revenue from solar energy systems sales
increased by $75.7 million compared to the prior year primarily due to solar
energy systems sales from Vivint Solar, as well as increased demand through
retail partners. Product sales increased by $35.9 million, primarily due to
lower volume of wholesale products sold in 2020, which was impacted by COVID-19.
Operating Expenses
                                                      Three Months Ended September 30,                        Change
                                                         2021                    2020                  $                  %

                                                                        (in thousands)

Cost of customer agreements and incentives $ 174,457 $ 77,350 $ 97,107

                126  %
Cost of solar energy systems and product
sales                                                      172,538                75,679             96,859                128  %
Sales and marketing                                        171,462                70,720            100,742                142  %
Research and development                                     5,602                 5,205                397                  8  %
General and administrative                                  51,290                41,829              9,461                 23  %
Amortization of intangible assets                            1,341                 1,167                174                 15  %
Total operating expenses                         $         576,690          $    271,950          $ 304,740                112  %


Cost of Customer Agreements and Incentives. The $97.1 million increase in Cost
of customer agreements and incentives was primarily due to the increase in solar
energy systems added to our fleet upon the acquisition of Vivint Solar in
October 2020, as well as new systems placed in service in the period from
October 1, 2020 through September 30, 2021, plus a full quarter of costs
recognized in 2021 for systems placed in service in the third quarter of 2020
versus only a partial quarter of such expenses related to the period in which
the assets were in service in 2020.
                                       47
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The cost of Customer Agreements and incentives increased to 75% of revenue from
customer agreements and incentives during the three months ended September 30,
2021, compared with 68% during the three months ended September 30, 2020. The
increase was impacted by the acquisition of Vivint Solar and the increase in
depreciation expense of approximately $32.0 million related to recording the
acquired solar systems at fair value, which was greater than the then-existing
book value, upon the acquisition of Vivint Solar.
Cost of Solar Energy Systems and Product Sales. The $96.9 million increase in
Cost of solar energy systems and product sales was due to the corresponding net
increase in the solar energy systems and product sales discussed above.
Sales and Marketing Expense. The $100.7 million increase in Sales and marketing
expense was attributable to increases in headcount, which were primarily driven
by the acquisition of Vivint Solar in October 2020, resulting in higher employee
compensation in the three months ended September 30, 2021 compared to the same
period in the prior year. Additionally, we spent more in costs to acquire
customers through our sales and retail lead generating partners. Additionally,
there was an increase of $0.2 million in non-recurring costs incurred during the
three months ended September 30, 2021. Included in sales and marketing expense
is $6.5 million and $3.7 million of amortization of costs to obtain Customer
Agreements for the three months ended September 30, 2021 and 2020, respectively.
Research and Development Expense. Research and development expense increased
$0.4 million during the three months ended September 30, 2021, which was
primarily attributable to the acquisition of Vivint Solar, resulting in an
increase in headcount driving higher employee compensation costs.
General and Administrative Expense. The $9.5 million increase in General and
administrative expenses was primarily attributable to the acquisition of Vivint
Solar, resulting in an increase in headcount driving higher employee
compensation, consulting costs, partially offset by a decrease of $8.3 million
in nonrecurring (primarily acquisition-related) costs during the three months
ended September 30, 2021.
Non-Operating Expenses
                                                 Three Months Ended September 30,                         Change
                                                    2021                    2020                  $                   %

                                                                   (in thousands)
Interest expense, net                       $         (89,096)         $    (51,368)         $ (37,728)                 73  %
Other (expense) income, net                 $          (4,332)         $        864          $  (5,196)               (601) %



Interest Expense, net. The increase in Interest expense, net of $37.7 million is
primarily related to the $27.5 million of interest expense associated with the
debt acquired with Vivint Solar. Included in net interest expense is $6.6
million and $6.2 million of non-cash interest recognized under Customer
Agreements that have a significant financing component for the three months
ended September 30, 2021 and 2020, respectively.

Other (Expense) Income, net. The increase in other expenses of $5.2 million
relates primarily to a loss on the early extinguishment of certain debt
instruments recognized in the three months ended September 30, 2021, with no
such comparable activity in the three months ended September 30, 2020.
Income Tax Expense (Benefit)
                               Three Months Ended September 30,                    Change
                                      2021                     2020            $             %

                                               (in thousands)
Income tax benefit      $        9,980                      $ (27,293)     $ 37,273        (137) %


The increase in income tax expense of $37.3 million primarily relates to an increase in losses allocable to noncontrolling interest and redeemable noncontrolling interest, a decrease in state income tax benefit, and a decrease in stock-based compensation deductions. These changes were offset by an increased pre-tax loss and a decrease in valuation allowance.


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Net Loss Attributable to Noncontrolling Interests and Redeemable Noncontrolling
Interests
                                                      Three Months Ended September 30,                         Change
                                                         2021                    2020                   $                  %

                                                                         (in thousands)
Net loss attributable to noncontrolling
interests and redeemable noncontrolling
interests                                        $        (265,462)         $   (122,848)         $ (142,614)               116  %



Net loss attributable to noncontrolling interests and redeemable noncontrolling
interests was primarily the result of an addition of five new investment funds
since September 30, 2020, for which the HLBV method was used in determining the
amount of net loss attributable to noncontrolling interests. Partially
offsetting these losses was approximately $2.4 million of net income related
Vivint Solar's noncontrolling interests and redeemable noncontrolling interests.
Redeemable noncontrolling interests generally allocates more loss to the
noncontrolling interest in the first several years after fund formation.

Comparison of the Nine Months Ended September 30, 2021 and 2020
Revenue
                                                Nine Months Ended September 30,                         Change
                                                  2021                     2020                  $                  %

                                                                  (in thousands)
Customer agreements                       $          549,689          $    294,991          $ 254,698                 86  %
Incentives                                            76,250                24,713             51,537                209  %
Customer agreements and incentives                   625,939               319,704            306,235                 96  %

Solar energy systems                                 307,408               168,094            139,314                 83  %
Products                                             241,378               113,987            127,391                112  %
Solar energy systems and product
sales                                                548,786               282,081            266,705                 95  %
Total revenue                             $        1,174,725          $    601,785          $ 572,940                 95  %


Customer Agreements and Incentives. The $254.7 million increase in revenue from
Customer Agreements was primarily due to both an increase in solar energy
systems under Customer Agreements being added to our fleet upon the acquisition
of Vivint Solar in October 2020, as well as new systems placed in service in the
period from October 1, 2020 through September 30, 2021, plus a full nine months
of revenue recognized in 2021 for systems placed in service in the first nine
months of 2020 versus only a partial amount of such revenue related to the
period in which the assets were in service in 2020. Revenue from incentives
primarily consists of sales of SRECs, which increased by $51.5 million during
the nine months ended September 30, 2021, compared to the prior year, due to the
timing of sales and market conditions.
Solar Energy Systems and Product Sales. Revenue from solar energy systems sales
increased by $139.3 million compared to the prior year primarily due to solar
energy systems sales from Vivint Solar, as well as increased demand through
retail partners. Product sales increased by $127.4 million, primarily due to
lower volume of wholesale products sold in 2020, which was impacted by COVID-19,
and customers' reduced purchases in 2020 after purchasing safe harbor materials
in 2019 for use in 2020.
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Operating Expenses
                                                       Nine Months Ended September 30,                         Change
                                                         2021                     2020                  $                  %

                                                                         (in thousands)
Cost of customer agreements and incentives       $          512,073          $    239,049          $ 273,024                114  %
Cost of solar energy systems and product
sales                                                       458,208               231,023            227,185                 98  %
Sales and marketing                                         442,174               210,691            231,483                110  %
Research and development                                     16,624                14,222              2,402                 17  %
General and administrative                                  199,836               111,659             88,177                 79  %
Amortization of intangible assets                             4,029                 3,817                212                  6  %
Total operating expenses                         $        1,632,944          $    810,461          $ 822,483                101  %


Cost of Customer Agreements and Incentives. The $273.0 million increase in Cost
of customer agreements and incentives was primarily due to the increase in solar
energy systems added to our fleet upon the acquisition of Vivint Solar in
October 2020, as well as new systems placed in service in the period from
October 1, 2020 through September 30, 2021, plus a full nine months of costs
recognized in 2021 for systems placed in service in the nine months of 2020
versus only a partial amount of such expenses related to the period in which the
assets were in service in 2020.
The cost of Customer Agreements and incentives increased to 82% of revenue from
customer agreements and incentives during the nine months ended September 30,
2021, from 75% during the nine months ended September 30, 2020. The increase was
impacted by the acquisition of Vivint Solar, which had negative gross margins
due to seasonality during the winter months at the beginning of the year when
solar production is lower, as well as the increase in depreciation expense of
approximately $95.9 million related to the step up in solar systems fair value
upon the acquisition of Vivint Solar.
Cost of Solar Energy Systems and Product Sales. The $227.2 million increase in
Cost of solar energy systems and product sales was due to the corresponding net
increase in the solar energy systems and product sales discussed above.
Sales and Marketing Expense. The $231.5 million increase in Sales and marketing
expense was attributable to increases in headcount, which were primarily driven
by the acquisition of Vivint Solar in October 2020, resulting in higher employee
compensation. Additionally, we spent more in costs to acquire customers through
our sales lead generating partners in the first nine months of 2021 compared to
the prior year period. Partially offsetting these increases in Sales and
marketing expense is a decrease in costs related to retail lead generating
partners, as well as a decrease of $7.6 million in non-recurring and
restructuring costs incurred during the nine months ended September 30, 2021.
Included in sales and marketing expense is $16.1 million and $10.7 million of
amortization of costs to obtain Customer Agreements for the nine months ended
September 30, 2021 and 2020, respectively.
Research and Development Expense. The $2.4 million increase in Research and
development expense was primarily attributable to the acquisition of Vivint
Solar, resulting in an increase in headcount driving higher employee
compensation costs, consulting costs and $0.2 million of nonrecurring
acquisition related costs.
General and Administrative Expense. The $88.2 million increase in General and
administrative expenses was primarily attributable to the acquisition of Vivint
Solar, resulting in an increase in headcount driving higher employee
compensation and consulting costs, partially offset by a decrease of $4.9
million in nonrecurring (primarily acquisition-related) costs during the nine
months ended September 30, 2021.
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Non-Operating Expenses
                                  Nine Months Ended September 30,                    Change
                                       2021                     2020             $             %

                                                  (in thousands)
Interest expense, net      $       (238,365)                $ (152,013)     $ (86,352)         57  %
Other income, net          $         18,462                 $      766      $  17,696       2,310  %



Interest Expense, net. The increase in Interest expense, net of $86.4 million
included $73.0 million of interest expense associated with the debt acquired
with Vivint Solar. The remaining increase is primarily related to additional
non-recourse debt entered into subsequent to September 30, 2020. Included in net
interest expense is $19.5 million and $18.5 million of non-cash interest
recognized under Customer Agreements that have a significant financing component
for the nine months ended September 30, 2021 and 2020, respectively.

Other Income, net. The increase in other income of $17.7 million relates
primarily to gains on derivatives recognized in the nine months ended September
30, 2021, with no such comparable activity in the nine months ended September
30, 2020.
Income Tax Expense (Benefit)
                               Nine Months Ended September 30,                   Change
                                     2021                     2020            $            %

                                               (in thousands)
Income tax benefit      $        (19,058)                  $ (30,424)     $ 11,366       (37) %



The decrease in income tax benefit of $11.4 million primarily relates to an
increase in losses allocable to noncontrolling interest and redeemable
noncontrolling interest, a decrease in state income tax benefit, and a decrease
in stock-based compensation deductions. These changes were offset by an
increased pre-tax loss and a decrease in valuation allowance.
Net Loss Attributable to Noncontrolling Interests and Redeemable Noncontrolling
Interests
                                                      Nine Months Ended September 30,                         Change
                                                        2021                    2020                   $                  %

                                                                        (in thousands)
Net loss attributable to noncontrolling
interests and redeemable noncontrolling
interests                                        $       (618,160)         $   (325,425)         $ (292,735)                90  %



Net loss attributable to noncontrolling interests and redeemable noncontrolling
interests was primarily the result of an addition of five other new investment
funds since September 30, 2020, for which the HLBV method was used in
determining the amount of net loss attributable to noncontrolling interests, as
well as $69.0 million of net loss related Vivint Solar's noncontrolling
interests and redeemable noncontrolling interests. Redeemable noncontrolling
interests generally allocates more loss to the noncontrolling interest in the
first several years after fund formation.

Liquidity and Capital Resources



As of September 30, 2021, we had cash of $717.6 million, which consisted of cash
held in checking and savings accounts with financial institutions. We finance
our operations mainly through a variety of financing fund arrangements that we
have formed with fund investors, cash generated from our sources of revenue and
borrowings from secured credit facilities arrangements with syndicates of banks
and from secured, long-term non-recourse loan arrangements. In 2020, we received
$595.0 million of new commitments on secured credit facilities arrangements with
syndicates of banks and $1.3 billion of commitments from secured, long-term
non-recourse loan
                                       51
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arrangements. Our principal uses of cash are funding our business, including the
costs of acquisition and installation of solar energy systems, satisfaction of
our obligations under our debt instruments and other working capital
requirements. As of September 30, 2021, we had outstanding borrowings of $209.3
million on our $250.0 million corporate bank line of credit maturing in April
2022. Additionally, we have purchase commitments, which have the ability to be
canceled without significant penalties, with multiple suppliers to purchase
$30.0 million of photovoltaic modules, inverters and batteries by the end of
2022. In January 2021, we issued $400.0 million of convertible senior notes with
a maturity date of February 1, 2026, for net proceeds of approximately
$389.0 million. Our business model requires substantial outside financing
arrangements to grow the business and facilitate the deployment of additional
solar energy systems. The solar energy systems that are operational are expected
to generate a positive return rate over the term of the Customer Agreement,
typically 20 or 25 years. However, in order to grow, we will continue to be
dependent on financing from outside parties. If financing is not available to us
on acceptable terms if and when needed, we may be required to reduce planned
spending, which could have a material adverse effect on our operations. While
there can be no assurances, we anticipate raising additional required capital
from new and existing investors. We believe our cash, investment fund
commitments and available borrowings as further described below will be
sufficient to meet our anticipated cash needs for at least the next 12 months.
The following table summarizes our cash flows for the periods indicated:
                                                      Nine Months Ended September 30,
                                                           2021                     2020

                                                              (in thousands)
Consolidated cash flow data:
Net cash used in operating activities          $       (535,829)                $ (166,759)
Net cash used in investing activities                (1,197,970)            

(686,752)


Net cash provided by financing activities             1,966,712             

871,796


Net change in cash and restricted cash         $        232,913

$ 18,285




Operating Activities
During the nine months ended September 30, 2021, we used $535.8 million in net
cash from operating activities. The driver of our operating cash outflow
consists of the cost of our revenue, as well as sales, marketing and general and
administrative costs. During the nine months ended September 30, 2021, our
operating cash outflows were $208.2 million from our net loss excluding non-cash
and non-operating items. Changes in working capital resulted in a net cash
outflow of $327.6 million.

During the nine months ended September 30, 2020, we used $166.8 million in net
cash from operating activities. The driver of our operating cash inflow consists
of the costs of our revenue, as well as sales, marketing and general and
administrative costs. During the nine months ended September 30, 2020, our
operating cash outflows were $146.3 million from our net loss excluding non-cash
and non-operating items. Changes in working capital resulted in a net cash
inflow of $20.5 million.
Investing Activities
During the nine months ended September 30, 2021, we used $1,198.0 million in
cash in investing activities. The majority was used to design, acquire and
install solar energy systems and components under our long-term Customer
Agreements.
During the nine months ended September 30, 2020, we used $686.8 million in cash
in investing activities. The majority was used to design, acquire and install
solar energy systems and components under our long-term Customer Agreements.
Financing Activities
During the nine months ended September 30, 2021, we generated $1,966.7 million
from financing activities. This was primarily driven by $748.1 million in net
proceeds from fund investors and $1,246.1 million in net proceeds from debt,
offset by acquisition of noncontrolling interest of $41.6 million and $9.2
million in repayments under finance lease obligations.
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During the nine months ended September 30, 2020, we generated $871.8 million
from financing activities. This was primarily driven by $555.0 million in net
proceeds from fund investors and $211.7 million in net proceeds from debt,
offset by $7.8 million in repayments under finance lease obligations.

Debt and Investing Fund Commitments
As of September 30, 2021, we had committed and available capital of
approximately $495.3 million that may only be used to purchase and install solar
energy systems. We intend to establish new investment funds in the future, and
we may also use debt, equity or other financing strategies to finance our
business. For a discussion of the terms and conditions of debt instruments and
changes thereof in the period, refer to Note 8, Indebtedness, to our
consolidated financial statements included elsewhere in this Quarterly Report on
Form 10-Q.

Convertible Senior Notes Offering
On January 25, 2021, we entered into a purchase agreement (the "Purchase
Agreement") with Credit Suisse Securities (USA) LLC and Morgan Stanley & Co.
LLC, as representatives of the several initial purchasers (the "Purchasers"), to
issue and sell $350.0 million aggregate principal amount of 0% Convertible
Senior Notes due 2026 (the "Notes") in a private placement to qualified
institutional buyers pursuant to Rule 144A under the Securities Act. The Notes
were sold to the Purchasers pursuant to an exemption from the registration
requirements of the Securities Act afforded by Section 4(a)(2) of the Securities
Act. In addition, we granted the Purchasers an option to purchase, during a
13-day period beginning on, and including, the date on which the Notes were
first issued, up to an additional $50.0 million aggregate principal amount of
Notes on the same terms and conditions. The Purchasers exercised their option in
full on January 26, 2021. The net proceeds from the sale of the Notes issued on
January 28, 2021 (after deducting the Purchasers' discount and estimated
offering expenses) was approximately $389.0 million.
On January 28, 2021, we entered into an Indenture (the "Indenture") with Wells
Fargo Bank, National Association, as trustee (the "Trustee"), pursuant to which
we issued $400.0 million aggregate principal amount of Notes. The Notes will not
bear regular interest, and the principal amount of the notes will not accrete.
The Notes may bear special interest under specified circumstances relating to
our failure to comply with our reporting obligations under the Indenture or if
the Notes are not freely tradable as required by the Indenture. The Notes will
mature on February 1, 2026, unless earlier repurchased by us, redeemed by us or
converted pursuant to their terms.
In connection with the offering of the Notes, on January 25, 2021 and January
26, 2021, we entered into privately negotiated capped call transactions with
Credit Suisse Capital LLC, represented by Credit Suisse Securities (USA) LLC,
Morgan Stanley & Co. LLC, Barclays Bank PLC, through its agent Barclays Capital
Inc., and Royal Bank of Canada, represented by RBC Capital Markets, LLC (the
"Capped Calls"). The Capped Calls each have an initial strike price of
approximately $117.91 per share, subject to certain adjustments, which
corresponds to the initial conversion price of the Notes. The Capped Calls have
initial cap prices of $157.22 per share. The Capped Calls cover, subject to
anti-dilution adjustments, approximately 3.4 million shares of common stock. The
Capped Calls are expected generally to reduce the potential dilution to the
common stock upon any conversion of Notes and/or offset any cash payments we are
required to make in excess of the principal amount of the Notes, as the case may
be, in the event the market price per share of common stock, as measured under
the Capped Calls, is greater than the strike price of the Capped Call, with such
offset subject to a cap. If, however, the market price per share of the common
stock, as measured under the Capped Calls, exceeds the cap price of the Capped
Calls, there would be dilution and/or there would not be an offset of such
potential cash payments, in each case, to the extent that the then-market price
per share of the common stock exceeds the cap price. We used approximately $28.0
million from the net proceeds from the issuance and sale of the Notes to
purchase the Capped Calls. The final components of the Capped Calls are
scheduled to expire on January 29, 2026.

Recent Accounting Pronouncements See Note 2, Summary of Significant Accounting Policies, to our consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q.


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