Becky H. Diffen

Becky H. Diffen Senior Associate, Energy Transactions

Becky’s practice focuses on energy transactions, mergers and acquisitions, and project development. She represents developers, private equity firms, investment banks, and a variety of other public and private companies in the renewable energy, power generation, and oil and gas industries on complex transactions, including mergers and acquisitions, joint ventures, development projects, and project finance. She also has experience advising clients on Texas regulatory law.

Becky has more than 14 years of experience in the power industry and previously worked as a utility-scale wind power developer. She has been recognized by Chambers USA, Legal 500, and Texas Rising Stars, serves as an adjunct professor at the University of Texas School of Law (where she teaches a seminar on electric power law), and is a co-author of Wind Law, the first wind law treatise, and Lexis Practice Advisor: Renewable Energy. In addition to her energy practice, Becky also represents clients in a range of mergers, acquisitions, dispositions, and strategic investments in the technology, health care, and real estate industries. The following is a list of representative matters in which Becky has assisted.

Experience Highlights

  • A tax equity investor in connection with the proposed divestiture of a large portfolio of wind, solar and geothermal projects
  • 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
  • A tax equity investor in connection with investments in three utility-scale PV solar projects located in North Carolina
  • Private equity fund in its acquisition of tax equity positions in four portfolios of more than 8,000 aggregated rooftop solar projects
  • 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

Energy – Clean Energy & Renewables

  • Wind developer in the acquisition and development of a 200 MW wind development in the Texas Panhandle
  • Underwriters to 8point3 Energy Partners LP in its $420 million initial public offering of common units 
  • Various renewable energy developers in the negotiation of Interconnection Agreements in Texas
  • Investment bank in its sale of a utility-scale Texas solar development and the option to sell a second solar project
  • 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
  • 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
  • Duke Energy Company in the 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
  • 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
  • Underwriters to Sol-Wind Renewable Power, LP in its initial public offering of common units (Suspended)
  • Underwriters to Pattern Energy Group Inc. in its $339 million public offering of common stock
  • Underwriters to Pattern Energy Group Inc. in its $382 million initial public offering of common stock
  • Public Utility Commission of Texas and ERCOT – assisted in the representation of various renewable energy developers, including representation in Competitive Renewable Energy Zone proceedings and ERCOT protocol appeals

Energy – Power

  • Quantum Utility Generation in its acquisition of gas-fired power generation development projects in Texas
  • EPC contract and other development work for a natural gas peaker plant in ERCOT
  • Riverstone Holdings in its $400 million acquisition of three coal-fired generating plants located in Maryland from a subsidiary of Exelon Corporation
  • Wayzata Investment Partners in the $625 million sale by its portfolio company, MinnTex Power Holdings, of its 1,050 MW, combined-cycle power plant in Guadalupe County, Texas to Calpine Corporation

Mergers & Acquisitions

  • USA Compression Partners in its $187 million acquisition of compression assets from S&R Compression in exchange for common stock units representing 20% of limited partnership interests in the company
  • Spredfast in its stock-for-stock acquisition of Mass Relevance, a technology leader in enabling social marketing experiences for brands and media companies
  • Pharos Capital Group in its acquisition of Seaside Healthcare, a behavioral health services provider
  • SailPoint Technologies in Thoma Bravo’s significant equity investment in the company, an identity and access management provider


Contact Details


T +1.512.542.8737
F +1.512.236.3382
2801 Via Fortuna
Suite 100
Austin, TX 78746-7568
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Becky's Practices

  • The University of Texas School of Law, J.D. with honors, 2009 (Editor in Chief, Texas Journal of Oil, Gas, & Energy Law; Magister, Phi Delta Phi; Wally Scott Endowed Presidential Scholarship; Tom C. Clark Fellows Scholarship; Phi Delta Phi Balfour Scholarship; Rocky Mountain Mineral Law Foundation Scholarship)
  • Carleton College, B.A., Computer Science, Political Economy (concentration), and Latin American Studies (concentration) magna cum laude, 2004 (Mortar Board National Honor Society, National Merit Scholar, varsity softball)
  • Admitted to practice: Texas 
  • Chambers USA, Associate to Watch in Energy: State Regulatory & Litigation (Electricity) (Texas), 2011–2016
  • Legal Media Group's Rising Stars (Euromoney), 2015 
  • Selected to the Texas Rising Stars list, Super Lawyers (Thomson Reuters), 2015 and 2016
  • Legal 500 U.S., Energy: Regulatory, 2013
  • Adjunct Professor: The University of Texas School of Law, Seminar on Electric Power Law, 2011, 2013, and 2016
  • Planning Committee: Renewable Energy Institute, The University of Texas School of Law CLE
  • Endowments Chair, Past-President, Founding Board Member, and Founding Fellow: Texas Energy Law Association 
  • Co-chair: Central Texas Chapter of Women of Wind Energy
  • Vice-President: Austin Public Library Friends Foundation
  • Member: Association of Women in Energy; Oil, Gas, and Energy Resources Law, Law section, State Bar of Texas; Administrative Law section, Austin Bar Association