Becky Diffen is chair of the firm’s renewable energy practice. She focuses her practice on energy transactions, mergers and acquisitions, and project development in the renewable energy, energy storage, and power generation industries. She also has experience advising clients on Texas regulatory law.
Becky has over 17 years of experience in the renewable energy industry and previously worked as a utility-scale wind power developer. She has been recognized in A Word About Wind’s “Top 100 Legal Power List,” Renewable Energy World’s inaugural “Solar 40 under 40,” Austin Under 40, Chambers USA, Legal 500 United States, Legal Media Group Rising Stars, and Texas Rising Stars and is a co-author of Wind Law, the first wind law treatise, and Lexis Practice Advisor: Renewable Energy.
Active in her community, Becky serves on the board of Zilker Theatre Productions and provides pro bono services to local affordable housing and family-focused non-profits. She is also a co-chair of the Austin Chapter of Women in Renewable Industries and Sustainable Energy (WRISE), as well as serving as chair of WRISE’s national webinar committee and the 2020 WRISE Leadership Forum.
Becky is a magna cum laude graduate of Carleton College and earned her J.D. with honors from the University of Texas School of Law, where she served as editor-in-chief of the Texas Journal of Oil, Gas, and Energy Law and now teaches a seminar on renewable energy law as an adjunct professor.
Representation of a regulated utility in contracts for the installation and ongoing operations of a utility-scale battery storage system.
Representation of Duke Energy in the upgrade of its Notrees wind farm battery system, including negotiations with Samsung SDI America, Inc. for the provision of new batteries and Younicos, Inc. for installation and service of the energy storage management system.
Representation of a solar developer in contracts for the construction of and maintenance services for a new technology battery energy storage system to be integrated with an existing solar project.
Representation of a battery manufacturer in agreements for the sale of battery systems.
Representation of Duke Energy in connection with the development of a 36 MW battery storage facility located at the Notrees Wind Farm in Texas, the largest battery storage system of its kind.Renewable Energy
Representation of a renewable energy fund as the lender in a facility loan to a renewable energy developer to finance and acquire solar energy projects.
Representation of Macquarie Capital in the development, tax equity financing and debt financing of a 200 MW wind farm in Oldham and Deaf Smith counties, Texas.
Representation of Apex Clean Energy in the sale of Dakota Range III, a 151.2 MW wind farm in Grant and Roberts counties, South Dakota, to ENGIE North America.
Representation of Apex Clean Energy in the sale of Dakota Range I & II, a 302.4 MW wind farm in South Dakota, to Xcel Energy.
Representation of a renewable energy fund in the development, financing, and acquisition of a portfolio of distributed solar projects in Massachusetts.
Representation of Apex Clean Energy in the acquisition of four solar projects totaling 442.5 MW in Virginia.
Representation of Hill Country Wind Power in the project development and sale of a 400 MW wind farm in Fisher County, Texas.
Representation of Apex Clean Energy in the sale of a 300 MW wind project in Clay and Dickinson County, Iowa to a public utility company.
Representation of Apex Clean Energy in the acquisition of a 175 MW wind farm in Lincoln, IL.
Representation of Apex Clean Energy in the acquisition of a 130 MW wind farm in Sangamon County, IL.
Representation of an energy infrastructure fund in the divestiture of $30 million of tax equity investments in a 200 MW wind project in Texas.
Representation of a developer in the acquisition and development of an anaerobic digestion poultry waste project in North Carolina.
Representation of a tax equity investor in connection with investments in four utility-scale PV solar projects located in North Carolina.
Representation of a private equity fund in its acquisition of tax equity positions in four portfolios of more than 8,000 aggregated rooftop solar projects.
Representation of an investment bank in its sale of a utility-scale Texas solar development and the option to sell a second solar project.
Representation of a tax equity investor in connection with the proposed divestiture of a large portfolio of wind, solar and geothermal projects.
Representation of a wind developer in the acquisition and development of a 200 MW wind development in the Texas panhandle.
Representation of underwriters to 8point3 Energy Partners LP in its $420 million initial public offering of common units.
Representation of various renewable energy developers in the negotiation of interconnection agreements in Texas.
Representation of a Tyr Energy, an Itochu Corporation, in its $500 million joint equity investment in the 845 MW Shepherds Flat wind power generation project in Eastern Oregon, at the time the largest wind farm in the world.
Representation of a King Abdullah City for Atomic and Renewable Energy on the establishment of a legal and regulatory framework for a renewable and civil atomic energy sector in the Kingdom of Saudi Arabia.
Representation of Duke Energy Company in a 50/50 joint venture with Sumitomo Corporation for the development, construction, financing, operation, and maintenance of Duke Energy’s 131 MW Cimarron II Wind Energy Project and 168 MW Ironwood Wind Energy Project, both located in Kansas.
Representation of underwriters to Sol-Wind Renewable Power, LP in its initial public offering of common units. (Suspended)
Representation of underwriters to Pattern Energy Group Inc. in its $339 million public offering of common stock.
Representation of underwriters to Pattern Energy Group Inc. in its $382 million initial public offering of common stock.
Assisted in the representation of various renewable energy developers, including representation in Competitive Renewable Energy Zone proceedings and ERCOT protocol appeals, before the Public Utility Commission of Texas and ERCOT.Power
Representation of Quantum Utility Generation in its acquisition of gas-fired power generation development projects in Texas.
Representation of a developer in connection with the EPC contract and other development work for a natural gas peaker plant in ERCOT.
Representation of Riverstone Holdings in the $400 million acquisition of three coal-fired generating plants located in Maryland from a subsidiary of Exelon Corporation.
Representation in connection with Power Purchase Agreement drafting and negotiations for a natural gas peaker plant in ERCOT and a fuel oil project in the Caribbean.
Planning Committee, Renewable Energy Institute, University of Texas School of Law CLE
Endowments Chair and Past-President, Texas Energy Law Association
Fellow, Travis County Women Lawyers Foundation
Co-Chair, Women of Renewable Industries and Sustainable Energy (WRISE), Austin Chapter
- Chair, 2020 WRISE Leadership Forum
- Chair, National Webinar Committee, WRISE
Board Member, Zilker Theatre Productions
Selected as an "Emerging Leader", The M&A Advisor, 2019
Named “Up and Coming,” Energy: State Regulatory & Litigation, Texas, Chambers USA, 2019
Named to “Texas Rising Stars,” Energy & Resources, Super Lawyers, Thomson Reuters, 2015-2019
Selected for A Word About Wind’s “Top 100 Legal Power List,” 2018
Selected for Renewable Energy World’s inaugural “Solar 40 under 40,” 2018
Selected as a “Rising Star – Energy,” Euromoney LMG Americas/International Financial Law Review, 2015 - 2018
Selected as Austin's Under 40 Award Winner, Engineering, Energy, Mobility and Systems Sciences, 2017
Named “Associate to Watch,” Energy: State Regulatory & Litigation, Texas, Chambers USA, 2011-2018
Named to Fellows of the Texas Bar Foundation, 2017
Selected for inclusion as a “Leading Lawyer,” Energy: Regulatory, Legal 500 United States, 2013
McGuireWoods’ Becky Diffen and Elizabeth Sieg Named Emerging Leaders by The M&A Advisor
June 12, 2019
Diffen Discusses Challenges Facing Wind Developers as Tax Credits Phase Out
January 29, 2019
McGuireWoods Partner Becky Diffen Honored on Inaugural ‘Solar 40 Under 40’ List
July 5, 2018