Management Team

The Clean Power Finance management team, board of directors and advisers include Silicon Valley entrepreneurs and veterans from the solar, finance, and Internet industries. We focus our significant expertise and experience on driving the mass-market adoption of solar.

Executive Team


Nat Kreamer

President & Chief Executive Officer

Nat is the President, CEO and member of the board of directors of Clean Power Finance. He is also the Chairman of the Board of Directors of SEIA (the Solar Energy Industries Association), the national solar trade organization. Nat’s original idea to finance solar for consumers led him to co-found SunRun, which he led as the company’s President and Chief Operating Officer. Nat was the President and member of the Board of Directors of Acro Energy Technologies, a residential and commercial solar integration company. He created the Chicago Climate Exchange market-making business for Pioneer Futures. Nat has also worked in power industry financial consulting at PricewaterhouseCoopers. An officer in the US Navy (Reserves), Nat is an Afghanistan war veteran, 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 and a “Most Admired CEO” award from the San Francisco Business Times. Nat has a BS from Northwestern University and an MBA from Rice University.

Mike Pope

Chief Financial Officer

Before joining the company, Mike was the COO and CFO of, which was acquired by Texas Pacific Group (TPG). Prior to, Michael served as Vice President for the office of the CEO of BearingPoint (NYSE: BE) and as President and COO of Network General, which was acquired by NetScout Systems (NASDAQ: NTCT). Before that, he was President and CEO of DigitalThink (Nasdaq: DTHK), EVP and CFO of Dionex (NASDAQ: DNEX), and a bank examiner at the New York Federal Reserve. Mike has a BA from Stanford University and an MBA from the University of California at Berkeley.

Kristian Hanelt

Senior Vice President, Renewable Capital Markets

Kristian has spent his career financing energy projects across a variety of energy sectors. He comes to Clean Power Finance from Tioga Energy. As the Vice President of Project Finance and a member of the founding team at Tioga, Kristian was instrumental in both project finance and corporate fundraising initiatives. Previously, Kristian worked as an Associate at ArcLight Capital Partners, an energy infrastructure-focused private equity investor. Prior to ArcLight, he was the Financial Manager for Gunnison Energy Corporation, where he controlled all finance-related activities for the startup natural gas producer. Kristian has also worked for Goldman Sachs’ Industrial and Natural Resources group, and PA Consulting’s Wholesale Energy Markets practice. Kristian has a BS in business administration from Boston University and an MBA from Stanford University.

Tom Harvey

Senior Vice President, Sales

Tom Harvey is the Vice President of Residential Sales at Clean Power Finance. Tom has played a leading role in expanding the adoption of third-party financing solutions for the U.S. residential solar market: in addition to his management role at Clean Power Finance, Tom previously spent more than three years as Director of Sales & Marketing at Sunrun, which he helped grow into one of the largest residential solar finance providers in the U.S. Prior to entering the renewable energy industry, Tom spent time in client-facing roles at software companies such as Coremetrics and Netcentives, and led mergers and acquisitions efforts for Performance Bicycle. Tom has a BA from the University of Colorado at Boulder and an MBA from the University of North Carolina at Chapel Hill’s Kenan-Flagler Business School.

Kirstin Hoefer

Senior Vice President, Customer Solutions

Kirstin brings more than 20 years of marketing and product management experience to her role at Clean Power Finance. As Senior Vice President of Customer Solutions, she leads the company’s product, engineering, marketing, and customer support teams focused on delivering exemplary products and services for both channel and investor partners. Kirstin has worked in the solar industry for six years, previously leading marketing teams at Sungevity and Sunrun. She was previously at eBay for six years, where she led product management and marketing teams responsible for eBay Motors, eBay Express and the end-to-end buyer experience on Prior to that, Kirstin worked for Excite@Home where she also led product, engineering and marketing organizations. Kirstin holds a BA in English from the University of California, Los Angeles and an MBA from Stanford University.

Nicholas Mack

Senior Vice President, General Counsel and Corporate Secretary

Before joining Clean Power Finance, Nick was the General Counsel and Corporate Secretary for Sungevity, a residential solar finance provider. Prior to Sungevity he was the General Counsel for Mainstream Energy, the parent of REC Solar and AEE Solar, the leading solar integration and distribution companies in the United States. Before entering the solar industry, Nick was the Deputy General Counsel at Yodlee, Assistant General Counsel in the Products Law Group at Sun Microsystems, and an Associate at Heller, Ehrman, White, & McAuliffe LLP. Nick has a JD from the University of California, Hastings College of Law and a BA from Georgetown University.

Micah Myers

Senior Vice President, Corporate Development

Micah has led teams in senior operational roles for more than 18 years and comes with deep experience in renewable energy, software and finance. Prior to rejoining as a full-time team member, Micah was the first Product Manager at Clean Power Finance in 2007. He later led the investment in Clean Power Finance as a Principal at Claremont Creek Ventures where he also served as a board observer with Alphabet Energy and Sentilla Corporation. He previously worked as an analyst for the energy team at Passport Capital. Still an officer in the US Marine Corps (Reserves), Micah has served in combat operations in both Iraq and Afghanistan and graduated from the TOPGUN Strike Fighter Weapons Instructor School. He holds a bachelor’s degree in physics from the University of California at Davis and an MBA from Stanford University’s Graduate School of Business. Micah also serves on the Board of Directors of SEPA (Solar Electric Power Association), an organization that helps utilities make smart solar decisions.

Steve Olszewski

Senior Vice President, Operations

Steve brings extensive consumer financial services experience to Clean Power Finance. Prior to joining the team, Steve served as a Senior Vice President at Discover Financial Services, where he led the student loans business through the integration of The Student Loan Corporation and later oversaw the largest portfolio acquisition in Discover’s history. He also managed the six-fold growth in the deposits business, which became the company’s largest funding source. Prior to Discover, Steve led underwriting and servicing operations for GMAC’s auto insurance business and held operations strategy roles at Capital One. He is an alumnus of McKinsey & Company and Andersen Consulting (now Accenture), where he served a variety of clients in the energy and financial services sectors. Steve graduated from Wesleyan University with a BA in economics and government and holds an MBA from Northwestern’s Kellogg Graduate School of Management.

Vice Presidents and Managing Directors


Arash Boostani

Managing Director and Chief Solutions Architect

Arash has over 20 years of experience as a software and technology professional. He joined Clean Power Finance in 2009 and has been chiefly responsible for designing and building the CPF Tools software platform. Prior to joining CPF, Arash was the technical lead for the Wikipedia Usability Initiative, a project aimed at increasing the usability of Wikipedia for new contributors and reducing barriers to public participation. Arash spent the first 14 years of his career at the biotech company Genentech. He supported the Manufacturing, R&D, Engineering and Quality Assurance business units in various roles, including Software Engineer, Project Manager and Enterprise Architect. Arash studied Physics at the University of California, Davis.

Darryl Carbonaro

Managing Director and Deputy General Counsel

Darryl has more than 15 years’ experience representing U.S and foreign lenders and borrowers in financing a broad range of assets, from hydroelectric facilities along the Danube to solar projects for a northern California school district. A former chemical engineer, Darryl began his legal career in the project and asset finance group at White & Case LLP in New York, then moved to Dechert LLP in San Francisco to focus on structured finance and securitization of commercial real estate. Prior to joining Clean Power Finance, he served as an assistant general counsel at Bank of America, where he helped launch the Bank’s renewable energy finance and energy efficiency finance groups. Darryl holds a JD from Pace Law School in White Plains, NY and a BS in Chemical Engineering from Drexel University in Philadelphia.

Sean Coletta

Managing Director, Renewable Capital Markets

Sean has raised or structured more than $1 billion in capital for solar projects, and led or assisted in developing and structuring thousands of residential, commercial and utility-scale solar facilities. At CPF, Sean is responsible for new residential fund origination and execution as well as commercial strategy. Prior to CPF, Sean was Managing Director of structured finance at CleanPath, LLC, co-founder of the Luminous Power Group, and Director of structured finance at FRV, LLC, formerly MMA Renewable Ventures. While at FRV, Sean was primarily responsible for raising non-recourse tax-advantage equity,
construction debt, and term debt. Sean has financed state tax credit transactions, New Market Tax Credit transactions, sale-lease-back transactions, and partnership flip transactions on a portfolio and individual basis. He began his career at Boston Capital, where he specialized in structuring multi-investor tax-advantaged equity funds. Sean holds a Bachelor’s degree in economics from Tufts University.

Greg Sellers

Vice President, Field Operations

Greg is a solar energy executive who has led industry efforts to increase quality and expedite the development of residential solar installations. Greg pioneered the development of residential solar inspections, founding and leading Burnham Energy, a company that inspected more than 2,500 systems in 31 states. He has spoken at major solar conferences, and is a founding member of SolarTech, an industry consortium seeking to resolve barriers to the adoption of solar energy. Prior to his work in the solar industry, Greg served as a public policy consultant for a wide range of public and private sector clients. He has a graduate degree in public policy from California State University Monterey Bay and the Panetta Institute, where he was named Panetta Institute fellow to the Academy of Achievement. Greg was elected and served three terms as City Councilmember in the Silicon Valley community of Morgan Hill, California.

Shawn Tabak

Vice President of Finance and Corporate Controller

Shawn brings a wealth of renewable energy transaction experience to CPF. He joined CPF in 2012 as Corporate Controller and has been instrumental in CPF’s expansive growth. Prior to joining CPF, Shawn was a Director at KPMG where he led a consulting practice that focused on renewable energy. Shawn has advised numerous project sponsors and investors on renewable energy transactions, including utility-scale, commercial and residential solar projects. He is a frequent speaker at industry conferences, including Edison Electric Institute and ELFA events. Shawn holds a BA from the University of California, Santa Barbara, and is a CPA.

James Tong

Vice President, Strategy and Government Affairs

James leads industry-wide efforts to accelerate solar deployment and reduce frictional “soft costs”. He has designed and led three projects awarded a total of $4.5MM from the Department of Energy SunShot Initiative and is currently a principal investigator in a $2.3MM research led by NREL to understand the drivers of consumer adoption of solar. James previously served as VP of marketing at Acro Energy and consulted for various solar companies. Prior to entering the solar industry, he served in various management positions at GE, where he completed its elite commercial leadership program. James earned a BA in economics from Yale University and an MBA from the Kellogg School of Management at Northwestern University. In 2013, he was named a finalist for the Platts Global Energy Awards Rising Star and was more recently recognized as a member of World-Generation’s Class of 2014 consisting of distinguished leaders in the energy industry.

Chris Wirth

Vice President, Marketing & Customer Support

Chris leads CPF’s marketing and customer support and service initiatives. He has spent more than 20 years creating value for businesses and consumers at start-ups and Fortune 500 companies in the energy, technology, defense, and construction industries. Chris has spent the last six years in residential and commercial solar finance, as well as solar manufacturing technology. Previously, Chris managed international channels for a US subsidiary of defense giant BAE Systems PLC, and led channel marketing for Interline Brands, a national distributor of building supplies. Chris also spent time in client services for VML, a global digital marketing agency, serving clients ranging from Bayer to Intuit TurboTax. Prior to that, he led business development for a manufacturing service provider to Applied Materials. Chris has a BS in Marketing from San Jose State University and an MBA from the University of North Florida.

Board of Directors


Rajiv Ghatalia

Chairman of the Board, President of Hennessey Capital Management

Rajiv A. Ghatalia is Chairman of the Board of Clean Power Finance and President of Hennessey Capital Management, a San Francisco-based investment firm. Rajiv spent sixteen years in Asia, first as a Partner and Co-head of Investment Banking for the Asia-Pacific region for Goldman Sachs, and later as a Partner at Warburg Pincus where he focused on the firm’s special situations and financial services investments in Asia. Rajiv also worked with Goldman Sachs in New York and London. He received a BA and BS from the University of Pennsylvania and an MBA from Harvard Business School. Rajiv has served on public, private and not-for-profit company boards, such as Nikko Asset Management, Transpacific Industries and Junior Achievement. He is currently Advisor to the Board of Proterra Inc., a provider of zero-emission solutions to the commercial transit sector, and is working with UCSF in the areas of healthcare delivery and personalized medicine.

Ed Feo

Managing Partner, USRG Renewable Finance

Ed is the managing partner of USRG Renewable Finance, the lending affiliate of the US Renewables Group. USRG is one of the nation’s largest, pure play private equity firms for renewable power, biofuels and clean technology infrastructure projects. Previously, he was a partner in the international law firm of Milbank, Tweed, Hadley & McCloy LLP where he co-chaired the Firm’s project finance and energy practice. Ed was identified for his work in renewable energy as one of “The Decade’s Most Influential Lawyers” by The National Law Journal, and was previously named one of the “Five Most Influential People in Renewable Energy” by Euromoney/Institutional Investor. Ed has his BA and JD from the University of California, Los Angeles.

Ben Kortlang

Partner, Kleiner Perkins Caufield & Byers

Ben is a Partner with Kleiner Perkins Caufield & Byers where he focuses on growth-stage greentech investing. Prior to KPCB, Ben worked at Goldman Sachs for eight years, most recently co-heading Goldman’s Alternative Energy Investing business. In this capacity, Ben managed Goldman’s multi-billion dollar portfolio of alternative energy investments including Horizon Wind Energy, SunEdison and First Solar. Prior to joining Goldman Sachs, Ben was an Associate with A.T. Kearney and a Business Analyst at National Australia Bank. Ben has a BS from RMIT University, a Bachelor of Commerce and an honors degree in econometrics from the University of Melbourne, and an MBA from the University of Michigan.

Joe Kraus

Partner, Google Ventures

Joe has been a Partner at Google Ventures since 2009, focusing on investments in mobile, gaming, and local services. Before moving in to Ventures, Joe held multiple product management roles at Google, including Blogger, Picasa, Sites, Friend Connect, and OpenSocial. He co-founded JotSpot in 2004, a wiki company that was acquired by Google in 2006. In 1993, Joe co-founded, an early Internet search engine.  During his tenure, he held multiple positions in the company, including leadership roles in product, business development, and marketing. In addition, Joe has been an active angel investor in multiple companies, including LinkedIn, Aardvark (sold to Google in 2010), Kongregate, and OpenCandy and he serves on the board of the Electronic Frontier Foundation (  Joe has a BA from Stanford University.

Nat Kreamer

CEO, Clean Power Finance

See above

Alex Weiss

Managing Director, ClearSky Power & Technology Fund I LLC

Alex is currently Managing Director of ClearSky Power & Technology Fund I LLC, a venture capital fund that primarily makes mid to late stage and growth equity investments in power and technology companies. He is also Vice President and Chief Investment Officer of a Fortune 200 energy company, and in this role he is responsible for investment decisions and fund management for more than $9.5 billion of invested financial assets. Previously, Alex was a vice president at Morgan Stanley, and a managing director in the investment banking divisions at Smith Barney and Paine Webber. He has over 20 years of experience working with private equity and venture capital funds. Alex has completed transactions across investment life cycles in a range of industries, including extensive experience in investing, equity raising, high yield, mergers and acquisitions, leveraged recapitalizations and restructurings. Alex holds a BA in mathematics and economics from Boston University and an MBA in finance from Columbia University.



Gary Kremen


Gary has over twenty years experience as a serial entrepreneur and expert in emerging growth companies, developing information technology, and Internet domain management. He is an investor in over 40 companies, private equity funds, and venture capital funds. Prior to Clean Power Finance, he was the founder and CEO of Grant Media, LLC, and co-founder and President of NetAngels.Com, Inc., bought by Microsoft. From 1993 through 1996, Gary founded and was Chairman of the Board of Electric Classifieds, Inc. / Match.Com, the leading on-line classifieds advertising technology outsourcing company that he eventually sold to Ticketmaster / Citysearch for $50 million. Gary has a BSE from Northwestern University and an MBA from Stanford University.

Adam Marsh


Before co-founding Clean Power Finance, Adam co-founded Coactive Networks, a technology startup that pioneered energy management, remote monitoring, and control over the Internet for commercial and residential buildings. At Coactive, he led strategic planning, product marketing, and investor relations, raising $42 million of venture capital. Adam also co-founded Internet identity company PrefPass, and has developed software ranging from web and mobile applications to large data analysis platforms to embedded systems. Adam has a BA in mathematics and physics from the University of California at Berkeley, a MS in physics from M.I.T., and has completed postgraduate work in theoretical physics.