Industry Experts

Spruce executives are recognized experts on topics ranging from residential solar financing to the future of the U.S. electric grid. Check out specific areas of expertise, publications, and biographies. To inquire about speaker availability, please contact

Nat Kreamer portrait

Nat Kreamer

President & Chief Executive Officer

Nat sold the first residential solar power purchase agreement (PPA) in the U.S. in 2007 and helped create what is today a multi-billion dollar market. His areas of expertise include: financing for total home sustainability; residential solar; residential solar finance structures and policy; solar and utilities; solar for investors; power markets; the U.S. solar landscape. Nat has spoken about the professionalization of the solar industry as solar finance becomes a mainstream consumer product, how to sell the right solar finance product (PPA, lease, debt product, loan or cash purchase) to the right consumer, and how new investors, such as utilities, can take advantage of the burgeoning distributed solar market.
Nat is the president, CEO and member of the board of directors of Spruce.  He is also the chairman of the board of directors of the national Solar Energy Industries Association (SEIA), advisor to the Rocky Mountain Institute, lecturer at the Institute for Sustainable Energy at Northwestern University, and member of the National Advisory Council for Grid Alternatives, which installs free solar systems for low-income families and provides solar job training. He was previously president and CEO of Clean Power Finance. Nat sold the first residential solar power purchase agreement in the U.S. when he co-founded Sunrun (NASDAQ: RUN) and served as its president and COO. Nat was subsequently the president and member of the board of directors of Acro Energy Technologies (TSX: ART). He created the Chicago Climate Exchange market-making business for Pioneer Futures and worked in power industry financial consulting at PricewaterhouseCoopers. An officer in the US Navy (Reserves), Nat is a veteran of the war in Afghanistan, where he served in the Special Forces and was awarded the Bronze Star Medal. He received a “Champion of Change” award from the White House, a “Most Admired CEO” award from the San Francisco Business Times, and was named a finalist for the Ernst & Young Entrepreneur of the Year award for Northern California. Nat has a BS from Northwestern University and an MBA from Rice University.
Nat has spoken at numerous solar and finance industry events, including: Fortune Brainstorm GREEN; Bloomberg New Energy Finance Summit; Wall Street Journal ECO:nomics; Department of Energy SunShot Technology Summit; White House Datapalooza; Bank of America Power & Gas Leaders Summit; Greentech Media Solar Summit; Intersolar North America; Renewable Energy Finance Forum – West; Solar Power International; Credit Suisse Disruptive Technology Company Conference; Goldman Sachs Cleantech Conference; Deutsche Bank Clean Tech, Utilities & Power Conference; Macquarie Utilities, Power & Energy Infrastructure Dialogue; and the Solar Power Finance & Investment Summit.
Nick Mack portrait

Nick Mack

Senior Vice President, General Counsel, and Corporate Secretary

Nick’s areas of expertise include: consumer protection best practices in the residential solar industry; consumer finance contracts and regulations; and regulatory compliance for new products and geographies. Nick helped lead a National Renewable Energy Laboratory-sponsored working group that developed standard residential solar lease and power purchase agreement templates. He was a founding member of the Solar Energy Finance Association, and currently co-chairs SEIA’s Consumer Protection Committee.
Nick oversees all of Spruce’s legal, corporate and contract activities, including: project finance and tax equity deals; lending facilities; consumer finance agreements; regulatory compliance for new products and geographies; privacy and data protection; project development law; intellectual property development and protection; vendor, channel and distribution agreements; dispute resolution; and general business, corporate, equity and HR matters. Nick was previously general counsel and corporate secretary for Clean Power Finance. Prior to that, he served as general counsel and corporate secretary for Sungevity. Before that, Nick was the general counsel for Mainstream Energy, the parent of REC Solar and AEE Solar. Before entering the solar industry, Nick was the deputy general counsel at Yodlee, an assistant general counsel in the Products Law Group at Sun Microsystems, and an associate attorney at Heller, Ehrman, White, & McAuliffe LLP. Nick is a founding member of the board of directors of the Solar Energy Finance Association, and co-chairs the Solar Energy Industries Association’s Consumer Protection Committee. He holds a JD from the University of California, Hastings College of Law and a BA from Georgetown University.
Nick has spoken about consumer protection best practices at a variety of events, including: Solar Power International; the American Bankers Association annual meeting; the annual UC Hastings Cleantech Roundtable; and solar industry meetings with the Federal Trade Commission, the Consumer Financial Protection Bureau, and Attorneys General of multiple states.