FuelCell Energy : Investor Day Presentation, dated March 16, 2022 - Form 8-K

Global Carbon Neutral PledgeCOUNTRIES 1 with net-zero emissions targetsUTILITIES 2 with net-zero emissions targetsCOMPANIES 2 with net-zero emissions targets1 Source - Energy and Climate Intelligence Unit, Carbon Neutrality Coalition - non-exhaustive list 2 Source - Respective Company Websites - non-exhaustive list© 2022 FuelCell Energy 26

Key Global Markets with Strong Policy Support to Accelerate Adoption WELL-POSITIONED IN KEY REGIONS TODAYNorth America● Markets where we are targeting growth opportunitiesEuropean UnionSouth KoreaAustraliaJapanFOCUSED ON TARGETING GROWTH IN THE EMERGING MARKETS OF TOMORROW • North America $9Bn Bipartisan bill for hydrogen and clean technologies • South Korea Government goal of 15GW of Utility-Scale Fuel Cells by 2040 • European Union €34bn investment in green hydrogen electrolysers by 2030 • Australia Govt investing $1.4bn in hydrogen industry buildupFUEL CELL SOLUTIONS POSITIONED TO SERVE THE FASTEST EVOLVING WORLD MARKETS AS THE ENERGY TRANSITION UNFOLDS© 2022 FuelCell Energy 27

Developing Comprehensive Set of Solutions to Maximize DecarbonizationENERGY SECTORS WHERE OUR TECHNOLOGY IS APPLICABLEHHyyddrorgoengen 2 SSttoorargaege CCCCSUU S23% 12% 10%FCE CAPABILITYFCE COMPLEMENTSNNaatutruarl aGal sGas8%BBiioofufeulsels 2%SSoolalar r15%CO2NNuucclelaer ar WWinindd10% 9%GGeeoothtehrmearlmal 2%OOtthherer 9%OUR TECHNOLOGIES INCLUDE THOSE WITH GREAT POTENTIAL TO ACCELERATE THE ENERGY TRANSITIONSource: Reuters Events Energy Transition Insight Survey, 2021© 2022 FuelCell Energy 28

Technology & Innovation© 2022 FuelCell Energy 29

Key Messages1 Carbonate fuel cell technology available since 2003; our existing fleet is installed around the world, demonstrating the reliability and durability of our proven technology2 Unique, proprietary technologies-Trigeneration: the only known platform capable of producing hydrogen, water & electricity; Carbon capture: the only known platform capable of capturing carbon from emitters while simultaneously producing power; Solid oxide: high efficiency, high temperature electrolysis1 3 Expanding from the base of proven commercial products today to commercialize newer hydrogen and carbon capture technologies 4 Deep organizational expertise with an engineering legacy dating back five decades 5 New market opportunities are emerging during the energy transition, and now we can accelerate path to scaling technologies1 Under development© 2022 FuelCell Energy 30

Leading Technologies to Provide More Energy SolutionsAPPLICATION CARBONATE1 SOLID OXIDE2Power gen/CHP3 from natural gas, biogas, or H2 blends ✓ ✓ Power generation/CHP from hydrogen fuel ✓ CO2 capture from platform ✓ ✓ CO2 capture from external source while making power ✓ H2/Power/Water production from natural gas or biogas ✓ ✓ High efficiency electrolysis H2 production ✓ Electrolysis/Reforming/Purification ✓TWO ADVANCED HIGH TEMPERATURE ELECTROCHEMICAL PLATFORMS TO ADDRESS MULTIPLE APPLICATIONS1 Carbon capture and electrolysis applications are under development; 2 Solid Oxide technology under development ; 3 generation / combined heat and power (CHP)© 2022 FuelCell Energy 31

Superior Advantages to Drive Adoption - Power1 MULTI-FEATURED Broad and capable fuel cell portfolio; Platforms to produce power with multiple applications for high-grade waste heat; Microgrid applications; Carbon separation2 ATTRACTIVE ECONOMICS & ENERGY SECURITY Providing power at the point of use rather than utilizing transmission lines, improves efficiency, reduces cost, reduces new grid/distribution network investment Eliminates long distance power line power losses, which average ~5% for the U.S. grid3 EASY TO SITE Compact footprint of SureSource system is a large differentiating factor, specifically in urban settings where land is limited and/or expensive and the power is most needed4 FUEL FLEXIBLE Renewable biogas, natural gas, hydrogen blends, and a variety of other fuels deliver low to zero carbon5 CARBON CAPTURE & CARBON SEPARATION Capture separation from platform power operations; Capture carbon from external source while making power1FuelCell Providing On-Site Power GenerationAvangrid Fuel Cell / Solar CombinationWastewater / Biofuel Applications Deliver Zero or Negative CO2 Emission ProfileELECTROCHEMICAL CONVERSION OF FUEL TO POWER CAN REDUCE EMISSIONS, INCREASE EFFICIENCY, AND IMPROVE SITING1 Under development© 2022 FuelCell Energy 32

Superior Advantages to Drive Adoption - Hydrogen1 MULTIPLE HYDROGEN PRODUCTION PLATFORMS Carbonate Trigeneration: co-production of power, hydrogen, and water; Carbonate reforming/electrolysis/purification; High efficiency solid oxide electrolysis12 MULTIPLE PLATFORMS DRIVE ECONOMICS IN DIFFERENT APPLICATIONS High power cost applications favor Trigeneration, where co-produced power drives revenue to reduce hydrogen cost; Low power cost applications favor electrolysis3 MODULAR, DISTRIBUTED SYSTEMS Modular architecture of carbonate and solid oxide hydrogen systems1 expected to position the Company to address the wide range of emerging hydrogen applications, from distributed to large scale4 LOW TO ZERO CARBON Trigeneration makes hydrogen from natural gas cleaner and with lower carbon footprint than conventional reforming; Trigeneration with biogas is carbon neutral or negative; Trigeneration can also have carbon separation; High efficiency of electrolysis platform1 will reduce carbon footprint from grid mix power, and will be able to produce more power from zero carbon renewables or nuclear power1Rendering of Long Beach Trigeneration PlatformLarge Scale Electrolysis PlatformMULTIPLE PLATFORMS ADDRESS DIVERSE HYDROGEN APPLICATIONS EMERGING DURING ENERGY TRANSITION1 Under development© 2022 FuelCell Energy 33

Video - Partnership with Toyota at Long Beach, CA Facility• Trigeneration platform we are building will address the need for hydrogen fueling infrastructure by cleanly and affordably generating high-purity hydrogen in an urban location• Will be the first 100% renewable Toyota facility in North America • Key value streams: • 2.3MW Clean power - will avoid grid emissions in an area with some of the worst air quality in US • 1.3 Tons/day green hydrogen - will fuel Toyota Mirai passenger vehicles and Toyota/Paccar heavy-duty hydrogen vehicles • 1,400 gallons/day water - will be used for car washing, avoids use of city water in severe drought areaTOYOTA PORT OF LONG BEACH, CA TRIGENERATION PROJECT© 2022 FuelCell Energy 34

Solid Oxide Electrolysis1EFFICIENCY ADVANTAGE22LARGE SCALE HYDROGEN PRODUCTION FROM NUCLEAR OR RENEWABLESDEMONSTRATION SYSTEM DISTRIBUTED HYDROGEN PRODUCTIONMULTIPLE PLATFORMS BEING DEVELOPED TO ADDRESS DIVERSE H2 APPLICATIONS EMERGING DURING ENERGY TRANSITION1 Under development; 2 As tested in demonstration project© 2022 FuelCell Energy 35

Long Duration Energy Storage1• Solid oxide stacks in electrolysis mode will produce hydrogen from power, with hydrogen to be stored for future use1MW REVERSIBLE SOLID OXIDE (RSOFC) SYSTEMH2 can be converted back to power or supplied to H2 user, enhancing project economics• Stored hydrogen will be sent back to stacks operating in fuel cell mode to make power. Stored hydrogen can also be exported to hydrogen user • Storage duration can be increased by adding hydrogen storage capacity. Geological storage of hydrogen can provide weekly or seasonal storage • The storage reactant is water, which is regenerated during power generation discharge - does notPOWERCharging power is converted to stored hydrogen by electrolysis of stored waterPOWERdepend on limited quantities of lithium or cobaltStored hydrogen is converted back to power and water in fuel cell modeAVOIDING DEPENDENCE ON LIMITED MINERALS, H2 BASED ENERGY STORAGE IS ONLY PRACTICAL APPROACH FOR LONG DURATION1 Under development© 2022 FuelCell Energy 36

Well-Positioned with Competitive AdvantagesINTELLECTUAL PROPERTY REPRESENTS A BARRIER TO ENTRY FOR POTENTIAL COMPETITORS Five decades of carbonate development leading to unique proprietary technologies for power generation, carbon capture1, and hydrogen production Two decades of solid oxide development leading to unique proprietary technologies for power generation and hydrogen production1TECHNOLOGIES ARE ATTRACTIVE BASED ON MARKET ECONOMICS High-efficiency power generation with optionality to co-produce heat, hydrogen, or CO2 Carbon capture with co-production of power reduces cost of capture1 High-efficiency electrolysis1 reduces cost of hydrogenSUSTAINABILITY OVER FULL PRODUCT LIFECYCLE ISO14001:2015, Environmental Management System certified Approximately 93% of power plant by weight can be recycled/reused at end of life Committed to the 2030 Net Zero target for scope 1 and scope 2 emissionsUNIQUELY POSITIONED WITH PROPRIETARY TECHNOLOGIES THAT CAN SCALE AS THE ENERGY TRANSITION GAINS MOMENTUM1 Under development© 2022 FuelCell Energy 37

Carbon Capture Technology With Favorable EconomicsCARBON SEPARATION Purification and capture of CO2 from fuel cell power generation Capturing fuel cell CO2 for supply to on-site use or distribution to local off-takers for food and beverage or industrial applicationsCARBON CAPTURE Purification and capture of CO2 from external sourcesCommercially available today Under development with ExxonMobil Research & Engineering CompanyONLY CARBON CAPTURE SOLUTION IN THE WORLD SHOWN TO ACHIEVE NET POSITIVE POWER GENERATION© 2022 FuelCell Energy 38

Accelerating Innovation Through Investments in Products, People and ProcessesINCREASING COMMERCIALIZATION INVESTMENT FOCUSED DEVELOPMENT EFFORTSFY2021 $11.3MFY2022E $45-$55M• Adding features and capabilities to our proven, patented molten carbonate design • Investments applied to specific technologies with greatest potentialFOCUSED ON IMPROVING COST AND RELIABILITY • Continued extension of design life and output of modules is a core R&D focus • Refined microgrid application features • Supply chain improvementsATTRACTING TOP TALENT • Dedicated engineers and scientists focused on realizing FuelCell Energy's purpose of enabling a path to carbon zero • Adding staff to R&D and engineering departmentsDEVELOPING COMMERCIAL PRODUCTS AND TECHNOLOGIES TO ENABLE THE ENERGY TRANSITION© 2022 FuelCell Energy 39

Q&A© 2022 FuelCell Energy 40

© 2022 FuelCell Energy Scaling Operations for the Future 41

© 2022 FuelCell Energy 42 Manufacturing expertise based on decades of proprietary knowledge Continuous improvement is culturally ingrained and important to capacity expansion as we further develop and leverage our operational excellence Scaling manufacturing capabilities to significantly ramp up our annualized production of fuel cell stacks and platform equipment to meet current and expected demand Flexibility to scale carbonate and solid oxide manufacturing capacity in North America and Europe Optionality to scale efficiently as new products reach commercialization Key Messages 1 2 3 4 5

© 2022 FuelCell Energy Established Integrated Operating Model OPERATIONS VALUE CHAIN SAFETY, QUALITY, CUSTOMER SERVICE Commercial Engineering Supply Chain Manufacturing Project Management Global Monitoring & Control Field Service Operations Commercial Design Robust Product Verification & Validation Testing Customer Engagement Requirements Review & Solidification Rigorous Supplier Qualification Supplier Quality Controls Supply Chain Risk Mitigation Inspection & Testing Integrated Manufacturing Operation - Core Technology Contract Mfg. Partners - Mechanical Equipment Turnkey Mfg. Partners - Electrical Equipment Highly Scalable Established Qualified Construction Services Network Site Civil Construction through Substantial Completion On - site Safety and EPC Quality Control Deliver Commercial Operations Centralized 24 - hour Monitoring and Control of Global Fleet Real - time Performance Monitoring Long - term Performance Optimization - Operations Engineering Integrated Field Service Team - Geographically Located Regionally in Project Markets Long - term Service Agreements Provide Preventive Maintenance, Platform Upgrades - to Improve Asset Performance CONTINUOUS IMPROVEMENT FEEDBACK

© 2022 FuelCell Energy 44 Advanced manufacturing process utilizing proprietary designs and state - of - the - art manufacturing equipment to produce components are the heart of the company's SureSource carbonate and solid oxide systems 1 Experienced global team with broad technical expertise optimizing our global manufacturing footprint as we ramp manufacturing of carbonate systems and work to launch commercial production of our solid oxide systems Fuel Cell Manufacturing Expertise - Global Footprint 1 Under development CARBONATE MANUFACTURING Torrington, CT, USA SOLID OXIDE MANUFACTURING Calgary, Canada CARBONATE MANUFACTURING Taufkirchen, Germany

© 2022 FuelCell Energy 45 OPERATIONAL EXCELLENCE • Safety: ISO45001:2018, Occupational Health & Safety System certified 4/2021 • Quality: ISO9001:2015, Quality Management System certified 11/2020 • Delivery: Manufacturing 100% OTD for 3 years with a 7% increase in installed fleet since 2019 LEAN CULTURE • Aggressively reducing waste as manufacturing production rate increases: 52% reduction YoY • Yield and efficiency improvements: optimization of 45 MW capacity on 1 - shift operation • Process improvements: reduction of cycle times >20% in final manufacturing operation step • Cost reduction/containment: direct and indirect cost reduction focus across platform ENVIRONMENTAL LEADERSHIP • ESG: ISO14001:2015, Environmental Management System certified 10/2021 • "Cradle - to - cradle" Life Cycle Analysis (LCA): approximately 93% of power plant by weight can be recycled/reused at end of life • Launched CO 2 footprint baseline, Organizational LCA, and roadmap to net zero campaign • Committed to the 2030 net zero target for scope 1 and scope 2 emissions Strong Culture of Continuous Improvement CONTINUOUS IMPROVEMENT CULTURE - SOLID FOUNDATION OF EXPERIENCE AND INDUSTRIAL RIGOR FuelCell Energy Safety Centered Culture Experience Modification Rate (EMR) Lean to Our Core Waste Reduction Realization Pounds of Waste Generated Annually (LBS.) Annualized Production Run Rate (MW) Experience Modification Rate (EMR)

© 2022 FuelCell Energy Qualified Global Supply Chain, Centered in North America, is Stable and Built on a Foundation of Strong Time - tested Relationships Headwinds: geopolitical trade challenges, commodity dynamics, COVID, logistics 46 INTEGRATED SUPPLY CHAIN QUALIFICATION AND RISK MITIGATION PROGRAM • Robust supplier qualification approval process • Ongoing rigorous performance and supply risk monitoring • Advanced supply chain scale - up planning for facilities, tooling, resources, and direct materials WORKING TO ASSURE SUPPLY CONTINUITY AND REDUCE RISK • Established relationships, strong commercial contracts, coupled with communication across Tier 1 suppliers • Focused and direct engagement with critical Tier 2 and Tier 3 suppliers • Overall lean inventory management with strategic focus on critical safety stock • Commodity market risk mitigation through physical hedging program • Alternate supplier development and qualification to increase optionality and competitive landscape • Developing supplier capabilities to improve quality, reduce lead time and costs, and expand capacity • Proactively advancing U.S. - domestic supplier development to mitigate geopolitical trade challenges Established and Stable Supply Chain FOCUSED ON MAINTAINING SUPPLY CONTINUITY BY LEVERAGING STRONG FOUNDATIONAL RISK MITIGATION STRATEGIES AND TACTICS ▪ North America (~84%) ▪ Europe (~8%) ▪ Asia (~8%) GLOBAL SUPPLY CHAIN

© 2022 FuelCell Energy FLEET GLOBAL MONITORING & CONTROL CENTER (GMCC) 47 CENTRALIZED GLOBAL MONITORING AND CONTROL • Entire global fleet centrally and remotely monitored 24/7 at our GMCC located in the U.S.; platforms do not require on - site operators • Field Service teams regionally located near fleet sites to enable rapid response times • Continuous improvement focus on fleet reliability • Legacy plants upgraded with newer - generation equipment to improve reliability and resiliency CORE FOCUS ON FLEET PERFORMANCE • Achieved a >9% increase in actual fleet output since 2018, many improvements implemented in 2020 & 2021 Performance of Installed Fleet

© 2022 FuelCell Energy 48 • Focused on completing construction and achieving commercial operation of current project backlog • Building selected cross - functional bench strength across operations to support project execution • Expanding qualification of strategic Engineering, Procurement and Construction (EPC) partnership network with leading site ci vil , mechanical and electrical construction firms • Streamlining project management and execution process Project Backlog Completion EXECUTION OF PROJECT BACKLOG CORE FOCUS ON SUSTAINABLE VELOCITY THROUGH THE PROJECT EXECUTION PROCESS - CONVERSION OF BACKLOG TO REVENUE IN CONSTRUCTION - SureSource Trigen Plant for Toyota Logistics America - Port of Long Beach, Long Beach, CA

© 2022 FuelCell Energy 49 NEAR - TERM PRODUCTION SCALE - UP • Passionate and experienced team driving continuous improvements across operations • Growing our team and increasing talent depth • Efficiently optimizing existing North American production facility with maximum annualized capacity of 100 MW when fully utilized; scalable to 200 MW with additional investment in machinery, tooling, equipment and inventory • Working to ensure supply chain capacity meets production demand • Leveraging existing facility footprint and infrastructure - with expansion of our U.S. and Canadian facilities STRATEGIC PRODUCTION SCALE - UP ROADMAP • Proven replicable production system - efficient to scale • Leveraging leading - edge technologies and advanced manufacturing automation • Evaluating optionality: strategic make/buy, acquisitions, licensing, partnering, or further internal expansion Roadmap for Scaling Capacity FUELCELL ENERGY North American Production Operations - Torrington, CT USA

© 2022 FuelCell Energy Focusing on the Human Element 50

© 2022 FuelCell Energy 51 Position of Chief People Officer created to support scaling the organization as we refocus our mission to build the next generation of talent as we grow our business Strategically building out HR infrastructure as a business partner model to better align the organization with business objectives Aggressively addressing current workforce trends and evolving our employee value proposition to attract critical talent as we scale We believe the inherent appeal of our purpose - driven culture is a competitive advantage that gives us confidence in our ability to execute Key Messages 1 2 3 4

© 2022 FuelCell Energy HUMAN RESOURCES TRANSFORMATION Transitioning HR to serve as a strategic business partner to align the organization with business objectives RECRUITMENT & SELECTION Thinking differently to attract, hire, and retain top talent by looking at skill - based hiring HUMAN CAPITAL INITIATIVES Harnessing our workforce expertise to develop the next generation of employees through a performance and talent management process LIVING OUR VALUES Committed to our values of inclusion and innovation; a diverse workforce amplifies skills and idea generation Human Resources Strategic Initiatives 52

© 2022 FuelCell Energy 53 Delivering clean innovative solutions one employee at a time by enabling a work environment that stimulates passion, collabor ati on, engagement and speed, to ensure a performance - based culture built upon a total rewards program with three main goals: Human Resources Mission Statement ENABLING A WORLD EMPOWERED BY CLEAN ENERGY ATTRACTING AND RETAINING THE BEST TALENT WINNING AS A TEAM - as a Company, and with our broad ecosystem of customers, partners, suppliers and the communities in which we operate ALIGNMENT OF EMPLOYEE AND SHAREHOLDER'S MUTUAL PURPOSE 1 2 3

© 2022 FuelCell Energy 54 NEW METHODS OF SOURCING HUMAN CAPITAL • Building our brand in the community • Working with schools/community colleges • Increasing visa sponsorship • More agile approach to screening 18 - TO 24 - MONTH VIEW OF TALENT NEEDS • Aggressively recruiting to fill open positions • Interview training - skill based • Build up manufacturing capabilities - adding additional shifts • Considering alternative opportunities to scale operational needs Attracting & Retaining The Best Talent RECRUITMENT AND SELECTION OUR FOCUS ON R&D AND ENGINEERING TALENT GROWTH WILL FURTHER DRIVE CULTURE AND COMPANY SUCCESS WHY PEOPLE CHOOSE FUELCELL ENERGY

© 2022 FuelCell Energy TALENT & PERFORMANCE MANAGEMENT • Initiating a new performance management platform that is tied to a pay - for - performance model • Developing individual growth plans to help people "GROW" their career • Establishing leadership competencies to know what "Winning Looks Like" at FuelCell Energy • Creating on - the - job experiences to grow professionally using the 70/20/10 model • Developing a technical career path for our engineering talent COMPENSATION & BENEFITS • Compensation - Standardized equity for most levels in the organization - Proper leveling tied to market value - Pay equity across the organization - Developing a rewards and recognition program • Benefits - Creating wellness programs - Modernizing our HR policies and procedures based on new norms - Benchmarking competitor benefit packages - Tuition reimbursement - Flexible work environment Our People Approach 55 RETAINING OUR TALENT: FORWARD LOOKING BUILDING NEXT - GENERATION TALENT TO STRENGTHEN OUR CULTURE The grass is greener where you water it

© 2022 FuelCell Energy GLOBAL FOOTPRINT DIVERSITY AND INCLUSION - UNITED IN PURPOSE Developing a Diversity Diagnostic Assessment Defining a DE&I commitment tied to compensation Fostering affinity groups • Celebrate Black History Month • Continue celebrations for Asian American and Pacific Islander Heritage Month • Celebrate National Hispanic Heritage Month Implementing unconscious bias training for ALL employees Recruiting Society for Women Engineers at UCONN and nationally Modernizing our policies A Journey To Be Best in Class 56 EDUCATED WORKFORCE CREATING AN INCLUSIVE WORK ENVIRONMENT THAT STIMULATES PASSION FOR OUR PURPOSE 22% FEMALE Photo: Manufacturing Day - October 2021 78% MALE 46% 30% 14% 5% 5% 1% High School Bachelors Masters PhD Associates JD

© 2022 FuelCell Energy Financial Update 57

© 2022 FuelCell Energy 58 Transformed balance sheet since implementation of Powerhouse strategy Multiple sources of funding resulting in strengthened financial liquidity Strong backlog with recurring revenues from long - term contracts with Tier 1 customers. Targeting increasing product sales in the U.S., Asia, and Europe bundled with long - term service contracts Strong financial foundation , expected to enable us to grow, scale, and innovate, while exploring strategic opportunities for partnerships Thoughtfully allocating capital to fund the next phase of growth aligned with addressable market opportunity Key Messages 1 2 3 4 5

© 2022 FuelCell Energy $9.4 $149.9 $432.2 $377.0 $30.3 $42.2 $28.0 $28.5 10/31/2019 10/31/2020 10/31/2021 1/31/2022 59 $405.4M OF CASH, RESTRICTED CASH AND EQUIVALENTS OF AS OF 1/31/22 • De - levered corporate balance sheet in FY 2021 • Paid down $87.3M of senior debt • Paid off $21.5M preferred stock obligation • Well - established financing relationships with bulge - bracket banks • Expanded sources of liquidity to include tax equity financing transactions, and we expect to target debt financing to accelerate strategic initiatives • Flexibility to scale by making investments in project assets, manufacturing, commercialization of hydrogen technologies, and sales and marketing efforts Transformed Balance Sheet CASH AND EQUIVALENTS ($M) STRENGTHENED BALANCE SHEET SINCE START OF POWERHOUSE STRATEGY PROVIDES FLEXIBILITY AND LIQUIDITY $192.1 $405.4 $39.8 ■ Restricted ■ Unrestricted $460.2

© 2022 FuelCell Energy INVESTMENTS IN PROJECT ASSETS 1 ($M) 60 • $256.1M of total project assets 1 as of January 31, 2022, reflecting progress made against project backlog • These assets are sited at Tier 1 off - takers under long - term power purchase agreements (PPAs) • As generation projects go into operation, we seek project financing through tax equity and debt, which allows capital to be redeployed and recycled in the business Liquidity to Invest in Growth 1 Project assets consist of capitalized costs for fuel cell projects and excludes accumulated depreciation. Net of depreciation , project assets totaled $235.6 million as of January 31, 2022. INVESTMENTS IN CAPEX GROW ASSET BASE AS PROJECTS GO INTO OPERATION $75.1 $99.4 $116.3 $165.5 $84.9 $91.2 $126.8 $90.6 10/31/2019 10/31/2020 10/31/2021 1/31/2022 $256.1 ■ Completed ■ In Development $190.6 $160.0 $243.1

© 2022 FuelCell Energy 2019 2020 2021 2022E 2023E 2024E 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 61 BACKLOG AS OF JANUARY 31 ($1B) Recurring Cash Flow Growth From Generation Portfolio 1 Purchase Power Agreements; RECURRING REVENUE EXPECTED TO GROW WITH EXECUTION OF PROJECT BACKLOG • Finished 2021 with 34MW of operating assets • Added the 7.4MW LIPA project in Q1 2022 • Expect to build out balance of generation over the medium term to total ~75MW Ŷ Generating Assets 1 (MW) MW Ŷ Backlog (MW) Backlog increased by approximately 3% year - over - year reflecting continued project execution and adjustments to generation backlog, primarily resulting from (i) the addition of the product sales backlog from the module order received from a POSCO Energy subsidiary, (ii) module exchanges with higher future output and revenues expected and (iii) inclusion of the project with United Illuminating in Derby, CT which was awarded in the second quarter of fiscal year 2021; Advance Technologies backlog reflects new contracts from the U.S. Department of Energy partially offset by work performed under our Joint Development Agreement with ExxonMobil Research and Engineering Company. Note that approximately $22.2 million of backlog which was previously classified as "Service and license backlog" was reclassified to "Product" backlog as a result of the settlement agreement with POSCO Energy. This amount represents the value of the extended warranty associated with the module order. $0.164 $0.123 $1.062 $1.092 $0.044 $0.032 $0.060 Q1 2021 Q1 2022 Product Adv. Tech. Generation Service + License $ 1.307 $1.270 Medium Term

© 2022 FuelCell Energy JOINT DEVELOPMENT AGREEMENT WITH EXXONMOBIL RESEARCH AND ENGINEERING COMPANY Utilizing FuelCell Energy's proprietary carbonate technology to develop and commercialize large scale carbon capture Working towards a future demonstration project at ExxonMobil location in Rotterdam, the Netherlands, leveraging the Porthos North Sea project CRITERIA AND FILTERS Market, customer and/or product Operational and supply chain alignment Core competencies and synergies POTENTIAL AREAS FOR NEW PARTNERSHIPS Manufacturing / capacity expansion Commercial geographic expansion Offtake of product attributes (i.e., power, hydrogen, CO 2 , environmental attributes, etc. Implementation of carbon capture Partnerships to Expand Presence and Capabilities 62 WE BELIEVE THERE WILL BE NATURAL PARTNERS ACROSS THE ENERGY TRANSITION ECOSYSTEM. PARTNERSHIPS CAN BE AN AVENUE TO STRENGTHEN THE COMPANY TO COMPETE IN THE MARKETPLACE FuelCell Energy will consider opportunities to establish strategically aligned partnerships, which could take many different for ms.

© 2022 FuelCell Energy COMMENTARY • Optionality to scale investments in various technologies • Efficient capital deployment to achieve product commercialization • Execution on project backlog • Investment in innovation to reduce manufacturing costs • Investment in R&D to commercialize technology and lengthen product life • Maintain strong balance sheet 63 DIVERSE SOURCES • Existing cash balance • Tax equity financing of completed projects • Existing and future debt financing • Potential future partnerships or JVs • Asset - backed financing • Equity capital markets (including At - the - market sales of shares) • Future cash flow from operations • Future revolver Clear Strategic Capital Allocation Priorities POTENTIAL SOURCES AND USES OF CASH INCREASING AVAILABLE LIQUIDITY TO FUND COMMERCIALIZATION OF NEW TECHNOLOGIES POTENTIAL USES • Completion of projects in backlog or future project awards • Expansion of manufacturing capacity of fuel cell modules • Expansion of manufacturing capacity for solid oxide products • R&D expense - Commercialize technology - Lengthen product life - Reduce cost • Acquisition of technologies or companies

© 2022 FuelCell Energy 64 PLANNED CAPITAL EXPENDITURES OF $40M TO $50M FOR FY2022 • Investments in our factories for carbonate and solid oxide production capacity expansion • Addition of test facilities for new products and components • Expansion of laboratories • Upgrades to and expansion of our business systems PLANNED COMPANY FUNDED R&D ACTIVITIES OF $45M TO $55M IN FY2022 to accelerate commercialization of our Advanced Technologies solutions • Distributed hydrogen • Long duration hydrogen - based energy storage • Hydrogen power generation PLANNED INVESTMENT OF $40 TO $60 MILLION for project assets in our Generation portfolio backlog FY2022 Projected Investments for Future Growth LARGE SCALE INVESTMENT TO ENABLE THE COMPANY TO COMPETE AND MEET THE MARKET NEEDS IN MEDIUM - AND LONG - TERM CAPITAL EXPENDITURES ($M) RESEARCH AND DEVELOPMENT ($M) $0.4 $6.4 $40 - $50 FY2020 FY2021 FY2022E $4.8 $11.3 $45 - $55 FY2020 FY2021 FY2022E

© 2022 FuelCell Energy 65 KEYS TO BUSINESS PLAN ACHIEVEMENT • Execution on project backlog, generating recurring revenue • Winning new business around the world • Capacity expansion • Achieving product commercialization (SOFC / Carbon Capture) and gaining market share • Reducing manufacturing costs and improving product performance through continuous innovation • Recruiting and retaining talent • Deploying capital efficiently Long Term Targets BASED ON COMMERCIALIZATION OF TECHNOLOGIES UNDER DEVELOPMENT REVENUE TARGETS AND INVESTMENTS TO BE UPDATED AS THE ENERGY TRANSITION EVOLVES MACRO ASSUMPTIONS • Continuation of the global energy transition with businesses and governments investing in resolving the global climate crisis and achieving their Net Zero commitments • Global carbon reduction initiatives receive broad regulatory support including a price for carbon • Hydrogen becomes a significant energy source • Continuation of favorable clean energy policies in the regions where we operate • FCE's Proprietary technology can command high margins FY 2025 Revenues > $300 Million FY 2030 Revenues > $1 Billion

© 2022 FuelCell Energy Closing Remarks 66

© 2022 FuelCell Energy Global tailwinds Compelling long - term strategy Significant competitive advantages Deep and broad leadership team including new talent Proven operating capabilities to support execution Disciplined approach to capital allocation Confidence in our future Key Messages 67

© 2022 FuelCell Energy Q&A 68

© 2022 FuelCell Energy Appendix 69

Appendix Total Addressable Market Climate initiatives are driving the global push to reduce greenhouse gases, including CO2, nitrogen oxides and sulfur oxides. The Company believes there exists a large and increasing combined total addressable market ("TAM") opportunity for the solutions the Company has commercially available today and the solutions that the Company is actively developing for commercialization, which are focused on addressing global climate change, air quality, emissions, and the need for resilient and reliable power. Through the unique capabilities of our platforms, we can isolate and remove CO2 from exhaust streams, provide distributed hydrogen cost effectively to further advance the transportation industry's shift to hydrogen powered vehicles, and provide industrial and utility customers with a secure and local supply of hydrogen. Hydrogen is also an effective medium for the storage of energy, and we are in the process of commercializing a highly efficient and environmentally favorable hydrogen- based long-duration energy storage solution. We believe hydrogen-based storage is environmentally superior to a mineral-based storage solution such as lithium-ion batteries. Additionally, through the deployment of our megawatt and sub-megawatt platform solutions, we can deliver the benefits of clean distributed power generation, including the desirable value stream of thermal energy, and avoid the need for massive, long distance transmission infrastructure and the risks that the traditional transmission grid creates. The Company views TAM as the overall revenue opportunity that is available for a product or solution if 100% market share is achieved. We believe that the combined value of our TAM opportunity based on third party sources and application of management's current assumptions is approximately $2 trillion cumulatively from the date hereof through the end of calendar year 2030 (the "Measuring Period"). This cumulative number represents the combined estimated total market size over the Measuring Period and is not a projection or estimate of the actual market share that the Company could achieve or the amount of revenue that could be generated in these markets in the Measuring Period. The four primary solutions which the Company views as serving its combined, cumulative $2 trillion TAM opportunity are: (i) Carbon capture, carbon separation and utilization (approximately $1 trillion). Carbon capture technology is currently under development by the Company to serve this market, while the Company currently has carbon separation and utilization solutions. The Company's ability to participate in the carbon capture market also assumes that ExxonMobil Research Engineering Company ("EMRE"), which funds some of the Company's research into carbon capture and which owns certain intellectual property rights related to the Company's carbon capture technology, will provide the Company with the necessary licenses or will otherwise allow the Company to exploit carbon capture technology outside of capturing carbon generated by the Company's own platforms (for which the Company does not require a license from EMRE) (ii) Distributed hydrogen (approximately $400 billion). The Company currently has a distributed hydrogen solution to serve this market. © 2022 FuelCell Energy 70

© 2022 FuelCell Energy 71 Appendix Total Addressable Market (cont.) (iii) Megawatt and sub - megawatt in front of the meter and behind the meter distributed power (approximately $300 billion). The Company currently has solutions to serve this market. (iv) Solid oxide based long - duration hydrogen energy storage and electrolysis (approximately $150 billion). Solid oxide based lo ng - duration hydrogen energy storage and electrolysis is currently under development by the Company to serve this market.

© 2022 FuelCell Energy 72 Appendix - Sources Carbon Capture TAM sources: 1) International Energy Agency, CCUS in Clean Energy Transitions Report (2020), available at https://www.iea.org/reports/ccus - in - clean - energy - transitions 2) Morgan Stanley, Carbon Capture Report (April 2021) (not publicly available, on file with the Company) 3) Intergovernmental Panel on Climate Change, Special Report on Global Warming of 1.5 ° C (October 2018) , available at https://www.ipcc.ch/sr15/ Distributed H2 TAM sources: 1) BloombergNEF , H2 Economy Outlook (2020), available at https://data.bloomberglp.com/professional/sites/24/BNEF - Hydrogen - Economy - Outlook - Key - Messages - 30 - Mar - 2020.pdf 2) Hydrogen Council, Hydrogen Insights 2021, available at https://hydrogencouncil.com/en/hydrogen - insights - 2021/ Distributed Power Generation TAM sources: 1) Morgan Stanley, Equity Research (July 2020) (not publicly available, on file with the Company) 2) MarketLine data, (not publicly available, on file with the Company) 3) Wells Fargo, Equity Research (April 2021) (not publicly available, on file with the Company) Energy Storage TAM source: 1) BloombergNEF , Long - Term Storage Outlook (2020) , available at https://about.bnef.com/new - energy - outlook - 2020/ 2) Wood Mackenzie, Power & Renewables (April 2021), available at https://www.woodmac.com/store/industry - sector/power - and - renewables/ 3) Guidehouse Insights, Market Data: Utility - Scale Energy Storage Market Update (1Q 2022), (not publicly available, on file with the Company)