Sara Mattern

Associate - Boston

Sara Mattern
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Sara Mattern advises both emerging companies and renewable energy companies on financings and all aspects of strategic development, including formation, intellectual property and industry-specific regulatory and policy matters.

Sara works with emerging company clients developing innovative technologies and business approaches to address a broad spectrum of issues. She works with emerging companies on early-stage formation and structuring matters, venture financings, strategic alliances and acquisitions. Sara also works with incubators and accelerators to support the development of their member companies.

Sara is an active member of the firm’s Energy Project Finance and Development practice. Sara works with sponsors, investors and developers on all aspects of renewable energy project development, tax equity, sponsor equity and debt financings, acquisitions, tax credits and state incentives, with a particular focus on distributed generation solar projects.

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  • Boston College Law School, J.D., cum laude, 2013
  • Georgetown University, B.S.F.S., cum laude, 2008



Representative Experience

Renewable Energy Project Finance

  • Represented Spring Lane Capital in investments in distributed waste water and composting infrastructure investments 
  • Represented AEGON USA Realty Advisors (an affiliate of Transamerica) in connection with tax equity investments in North Carolina solar portfolios totaling 100MW and 30MW, respectively
  • Advised a sponsor equity investor in its investment in a portfolio of over 30MW of wind and solar PV
  • Advised solar developers and investment managers in multiple acquisitions of solar project portfolios
  • Represented Soltage, LLC in equity financings to leverage state and federal tax credits for renewable energy development
  • Represented Soltage, LLC in connection with a $140 million equity capital partnership with Basalt Infrastructure Partners LLP and various joint ventures, project acquisitions, tax equity and back leverage financings, and other financing transactions
  • Represented Greenwood Energy, a division of a diversified family-owned business, in US solar financing activities, including hybrid construction and permanent lending facilities, tax equity financings and back leverage lending facilities
  • Advised GoldenSet Capital Partners in connection with $50 million sponsor equity and tax equity investments for a portfolio of Massachusetts solar projects
  • Advise sponsors and developers in back leverage debt financings of solar assets

Venture Financings

  • Advised Energetic Insurance in its initial $2.5 million Series Seed financing
  • Represented clean agriculture tech company in $5 million Series Seed financing
  • Represented Tank Utility, Inc. in multiple equity financings
  • Counsel Energetic Insurance, Inc. in its initial $2.5 million financing round
  • Represented Recorded Future, Inc. in multiple venture financings, including $25 million Series E round
  • Counseled a leading residential energy efficiency provider in multiple equity financings
  • Represented Altaeros Energies, Inc. in a Series A financing led by Softbank Corp.
  • Advised CutisPharma, Inc. in a $20 million equity financing
  • Represented early stage cleantech, technology and life sciences companies in equity and debt venture financings

Mergers & Acquisitions

  • Represented Recorded Future, a threat intelligence company, in its sale of a controlling interest in the company valued at $780 million to Insight Partners
  • Represented Sun Catalytix in sale to Lockheed Martin
  • Advised Alere Inc. in its $600 million sale of Alere Health, LLC to Optum
  • Advised multiple public companies in acquisitions of venture-backed technology companies
  • Represented Quantia, Inc. in its sale to Physicians Interactive, Inc.
  • Advised a U.S. based developer of gas-to-liquid projects in their sale of the company to Velocys plc
  • Note, “Municipal Energy Benchmarking Legislation for Commercial Buildings: You Can't Manage What You Don't Measure,” 40 Boston College Environmental Affairs Law Review 487 (2013)
  • Comment, “FYI to the FAA on FLL: Approval of a Runway Extension in City of Dania Beach” 39 Boston College Environmental Affairs Law Review E. Supp. 69 (2012)

Foley Hoag Alerts & Updates


  • Greater Boston Chamber of Commerce, Women’s Leadership Program: 2018-2019 
  • Boston College Environmental Affairs Law Review, Executive Articles Editor


  • Greentown Labs, Advisory Board Member
  • Women’s Bar Association, Member
  • New England Women in Energy and the Environment, member
  • Boston Bar Association, Member
  • Foley Hoag Foundation, Grant Proposal Reviewer
  • Cleantech Open, Judge
  • Women’s Energy Network, Member, Boston chapter
  • Moderator, “Development and Financing Trends in the Northeast,” Solar and Energy Storage Northeast Forum (February 19, 2020) 
  • Panelist, “The Future of Electric Vehicles,” Women’s Energy Network, Boston Chapter (November 19, 2019) 
  • Speaker, “Equity Compensation Basics for Startups,”  Greentown Labs (October 30, 2019)
  • Speaker, “Out of the Incubator: Finding Office Space for Startups,” Massachusetts Clean Energy Center and City of Somerville (October 30, 2019)
  • Webinar, "Preparing for Investors: Understanding Term Sheets and Financings" (August 5, 2019) 
  • Speaker, “Legal Challenges for a Cleantech Startup,” Cleantech Open East Coast Academy (June 12, 2018)
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Bar Admissions

  • Massachusetts