Board of Directors

William J. (John) Berger

John is President and Chief Executive Officer of Sunnova Energy Corporation, the leading privately-held U.S. residential solar and storage service provider whose technology-enabled service platform is centered on providing a better service at a better price through its unique 25-year service commitment with every homeowner’s customized solar or solar + storage system. With more than two decades of experience across various sectors of the energy industry, John is an energy entrepreneur who has always supported free market competition, consumer choice and the advancement of energy technology to power energy independence.

Before Sunnova, John served as Founder and Chief Executive Officer at SunCap Financial, a residential solar system lease provider. He also founded Standard Renewable Energy (SRE), a top-10 provider of renewable energy and energy-efficient products and services. John received his MBA from Harvard Business School and graduated cum laude from Texas A&M University with a Bachelor of Science degree in civil engineering.

Anne Slaughter Andrew

Ms. Andrew is an accomplished executive, lawyer, entrepreneur and diplomat whose career has centered on developing strategies and advancing solutions for a thriving economy and sustainable environment. Since August 2018, Ms. Andrew has served as a principal of WindRun Alliances LLC, a consulting company. From January 2014 until October 2019, Ms. Andrew was an investor, member of the board of directors, and chair of the audit committee of Ad Astra Rocket Company, a spaceflight technology company with a subsidiary developing an integrated “turn-key” solution of distributed renewable energy systems, and investor and member of the board of directors of Metalub Soluciones Verdes MSV S.A., a sustainable lubricant company whose mission is to reduce its customers’ carbon footprint.

Ms. Andrew also serves as a director and chair of the nominating and governance committees of the non-profit organizations, The NewDEAL and Natural Resources Defense Council. Ms. Andrew was U.S. Ambassador to Costa Rica from December 2009 until June 2013.

Ms. Andrew holds a Bachelor of Arts degree from Georgetown University and graduated cum laude from Indiana University McKinney School of Law with a Juris Doctorate.

Rahman D’Argenio

Mr. D’Argenio is a Partner at Energy Capital Partners. He is involved in all areas of the firm’s investment activities, with particular emphasis on fossil and renewable power generation and energy related services and manufacturing.  Mr. D’Argenio currently serves on the boards of NESCO Holdings LP, PLH Group, Inc, and Sunnova Energy Corporation.

Prior to joining Energy Capital in 2010, Mr. D’Argenio spent seven years at First Reserve Corporation, an international energy-focused private equity firm based in Greenwich, Connecticut. His responsibilities at First Reserve included a leadership role in power, financial services and coal related investments. Prior to that, Mr. D’Argenio worked in the Energy & Utilities Investment Banking Group at Deutsche Bank Securities. Mr. D’Argenio began his career in the structured finance group at Sempra Energy Trading.

Mr. D’Argenio received a B.A. in Mathematics and Economics from the University of Pennsylvania.

Matt DeNichilo

Mr. DeNichilo is a Principal at Energy Capital Partners. He is involved in all areas of the firm’s investment activities, with particular emphasis on fossil and renewable power generation.  Mr. DeNichilo serves on the boards of Broad River Power Holdings, LLC, PLH Group, Inc., Terra-Gen, LLC, Empire Gen Holdings, Inc, and Sunnova Energy Corporation. 

Mr. DeNichilo received a B.S.E. in Operations, Research and Financial Engineering from Princeton University.

Doug Kimmelman

Mr. Kimmelman established Energy Capital Partners in April 2005 and serves as its Senior Partner.  Mr. Kimmelman currently serves on the boards of US Development Group, LLC, USD Partners, LP, CE2 Carbon Capital, LLC, PLH Group, Inc, NESCO Holdings LP, and Sunnova Energy Corporation.

Prior to founding Energy Capital, Mr. Kimmelman spent 22 years with Goldman Sachs, starting in 1983 in the firm’s Pipeline and Utilities Department within the Investment Banking Division. He remained exclusively focused on the energy and utility sectors in the Investment Banking Division until 2002 when he transferred to the firm’s J. Aron commodity group. He was named a General Partner of the firm in 1996.

Mr. Kimmelman was instrumental in developing the Constellation Power Source concept as the initial entry point for Goldman Sachs as a principal into electricity markets. Additionally, Mr. Kimmelman was involved in the formation of Orion Power Holdings, Inc. From 2002 to 2005, Mr. Kimmelman played a leadership role at Goldman Sachs in building a power generation asset portfolio through the J. Aron commodity group.

Mr. Kimmelman received a B.A. in Economics from Stanford University and an M.B.A. from the Wharton School at the University of Pennsylvania.

Michael C. Morgan

Michael C. Morgan is a co-founding partner of Triangle Peak Partners, LP, and serves as its chairman and chief executive officer. Since 2004, he has been the president and chief executive officer of Portcullis Partners, LP, a private investment partnership and one of Triangle Peak’s largest limited partners.

Morgan also serves as the lead director of Kinder Morgan, Inc. (KMI), the largest energy infrastructure company in North America, which operates or owns an interest in over 80,000 miles of pipelines and 180 terminals. He joined Kinder Morgan when it was founded in early 1997 and headed its corporate development efforts until 2001, completing 23 acquisitions worth over $5 billion and later serving as company president until 2004.

He has represented Triangle Peak Partners on the boards of Bunchball, Lytx and SCIenergy. He is a frequent volunteer at Stanford University, currently serving on the GSB Management Board, the Precourt Energy Institute, the DAPER Fund and several ad hoc committees. Morgan previously served on the boards of two public energy funds affiliated with Kayne Anderson (NYSE: KYN and KYE and was an adjunct professor in the practice of management at the Jones Graduate School of Management at Rice University.

Morgan received a bachelor’s degree in economics and a master’s degree in sociology from Stanford University. He later earned his MBA from Harvard Business School.

C. Park Shaper

C. Park Shaper is the chief executive officer of Seis Holdings, LLC. Seis is a private investment holding company seeking opportunities to take meaningful equity positions in cash flow-generating, private businesses. In addition to serving on the Sunnova board of directors, he serves on the board of Kinder Morgan, Inc., the largest midstream company and the third-largest energy company in North America (based on combined enterprise value).

Shaper previously served as president and member of the office of the chairman of Kinder Morgan. He joined Kinder Morgan in 2000 as vice president and chief financial officer. He was named to the office of the chairman in 2003, and held the titles of executive vice president in 2004 and president in 2005. He stepped down as an officer of the entities in March 2013. Shaper was instrumental in spearheading the company’s transparent financial reporting and communication to the investment community.

Prior to joining Kinder Morgan, he was president and director of Altair Corporation, an enterprise focused on the distribution of web-based investment research for the financial services industry. He also served as vice president and chief financial officer for Data Analytics, and was a consultant for The Boston Consulting Group, as well as the Strategic Services Division of Andersen Consulting.

Shaper holds bachelor’s degrees in industrial engineering and quantitative economics from Stanford University. He also earned an MBA from the J.L. Kellogg Graduate School of Management at Northwestern University. He is the trust manager for Weingarten Realty Trust and is also active in the Houston community, sitting on the board of directors of Texas Children’s Hospital, the Alley Theatre, the Children’s Museum of Houston and Genesys Works.

Mark Longstreth

Mr. Longstreth is a Managing Director at Soros Fund Management LLC, where he is a member of the Strategic Investments Group focusing on the Power, Energy and Infrastructure sectors.  Mr. Longstreth currently serves on the boards of VPI Holding Limited, GRL Holdings Pty Ltd and Sunnova Energy Corporation.

Prior to joining Soros Fund Management in 2007, Mr. Longstreth worked in the Technology, Media and Telecom Investment Banking Group at Bear Stearns.

Mr. Longstreth received a B.S.F.S. in International Economics from Georgetown University, where he was a John Carroll Scholar.

Scott Steimer

Mr. Steimer is a Vice President at Energy Capital Partners. He is involved in all areas of the firm’s investment activities, with particular emphasis on fossil and renewable power generation. Prior to joining Energy Capital, Mr. Steimer worked in the Power & Utilities Investment Banking Group at Bank of America Merrill Lynch.

Mr. Steimer received a B.S. in Finance and Accounting from Ithaca College.