ENERNOC : ANNOUNCES RESULTS OF OFFER TO REPURCHASE ITS 2.25% CONVERTIBLE SENIOR NOTES DUE 2019

ENERNOC ANNOUNCES RESULTS OF OFFER TO REPURCHASE ITS 2.25% CONVERTIBLE SENIOR NOTES DUE 2019

BOSTON, September 22, 2017 (GLOBE NEWSWIRE) - EnerNOC, Inc. ("EnerNOC"), a

subsidiary of Enel Green Power North America, Inc. ("EGPNA"), today announced, in accordance with the indenture governing its 2.25% Convertible Senior Notes due 2019 (the "Notes"), the results of its offer to repurchase any or all of the outstanding Notes for cash equal to 100% of the principal amount of such Notes, plus any accrued and unpaid interest to, but excluding September 22, 2017 (the fundamental change repurchase date). The offer was governed by the terms and conditions set forth in the Notice of Fundamental Change and Offer to Repurchase, dated August 24, 2017 (the "Offer") and expired at 5:00 p.m. EST on September 21, 2017.

A total of $124,285,000 aggregate principal amount of Notes were validly tendered into and not withdrawn from the Offer representing, approximately 98.02% of EnerNOC's outstanding Notes. The amount holders are entitled to receive, including accrued and unpaid interest to, but excluding, the currently scheduled fundamental change repurchase date, is approximately

$1,002.375 per $1,000 principal amount of the Notes. None of the holders converted their Notes.

The information agent and tender agent for the Offer is D.F. King & Co., Inc. Questions regarding the Notes or the Offer may be directed to D.F. King & Co., Inc. at [phone] (toll-free) or [phone] (collect).

This press release does not constitute an offer to buy or the solicitation of an offer to sell Notes in any circumstances or jurisdiction in which such offer or solicitation is unlawful.

About EnerNOC

EnerNOC has active demand response networks in North America, Europe and Asia-Pacific. Additionally, EnerNOC offers an energy intelligence software that enables businesses to boost facility efficiency, simplify utility bill management and ease reporting burdens. The company's energy procurement tools and services help customers buy energy more strategically, manage risk, and optimize pricing.

About EGPNA and the Enel Group

Enel Green Power North America, Inc., headquartered in Andover, MA, manages a portfolio of over 100 renewable energy power plants for a total capacity exceeding 3.3 GW and additional 900 MW currently under construction. In January the Enel Group bought 100% of Demand Energy Networks (Demand Energy), a US-based company specialized in intelligent software and

energy storage systems, whose DEN.OSTM software enables real-time optimization of energy management, with the potential to revolutionize the way electricity is generated, stored and consumed.

The Enel Group operates in 29 countries, producing energy through a managed capacity of approximately 83 GW. Enel distributes electricity and gas through a network of over 2 million kilometres, and, with more than 65 million business and household customers worldwide, the Group has the largest customer base among European competitors. Enel is the largest utility in

Europe in terms of market capitalization and figures among Europe's leading power companies in terms of installed capacity and reported EBITDA. Enel's green energy division, Enel Green Power (EGP), a leading multinational renewable energy player, manages around 39 GW of wind, solar, geothermal, biomass and hydropower plants in Europe, the Americas, Asia, Africa and has recently arrived in Australia.

Enel Media Relations

T [phone]

F [phone]

[e-mail] EnerNOC Media Relations Sarah McAuley

(617) 32-8195

[e-mail]

2