Board of Directors


Board of Directors

Peter L. Corsell, Chairman

Peter L. Corsell is Managing Partner at Twenty First Century Utilities. Corsell is an entrepreneur and investor known for successfully bringing emerging technologies to market. MIT’s Technology Review recognized him as one of the world’s top innovators under age 35, the World Economic Forum named him a Young Global Leader, and the National Association of Corporate Directors included him on its inaugural list of leading directors under 40.

Corsell  is also Chairman of GridPoint, a TFC Utilities portfolio company, which he founded in 2003 and led as CEO until 2010. An established cleantech leader and pioneer in the Internet of Things, GridPoint enables businesses, utilities and government agencies to maximize energy savings and environmental sustainability. The company has deployed more than 500,000 connected devices and has saved its customers over 3.1 billion kilowatt-hours of energy.

Corsell is a board member and driving force behind several technology companies, with a focus on big data analytics and enterprise software. He was founding Chairman of the World Economic Forum’s Global Agenda Council on Sustainable Energy and serves on the board of the Wolfsonian Museum in Miami Beach. He has been featured in several books including Hot, Flat, and Crowded by Tom FriedmanPerfect Power by Robert Galvin and Kurt Yeager, Earth: The Sequel by Fred Krupp and The Clean Tech Revolution by Ron Pernick and Clint Wilder.

Earlier in his career, Corsell served as a political analyst at the Central Intelligence Agency and with the U.S. Department of State in Havana, Cuba. He holds a BSFS, International Affairs, from the Edmund A. Walsh School of Foreign Service at Georgetown University.



Ken Floyd

Ken Floyd is Managing Partner, Customer Programs & Distribution at Twenty First Century Utilities. A 25-year veteran of the utility industry, Floyd is known for transforming legacy utility business models by driving costs down and improving customer and employee satisfaction. Floyd was most recently Partner at Utilligent, a utility management consulting company working with public power agencies and investor-owned utilities. He has been Vice President, Marketing and Customer Solutions, for Xcel Energy, where he led a division of 1,800 employees across eight states, including all of marketing, customer care, demand management, and “meter-to-cash” functions. Floyd held senior positions in distribution and customer service at Sacramento Municipal Utility District and Pacific Gas & Electric, where he began his career. He holds a BS, Management, from Golden Gate University and an MBA from St. Mary’s College.



Larry Kellerman

Larry Kellerman is Managing Partner at Twenty First Century Utilities. Kellerman has spent over three decades in the electric utility, power generation and independent energy industries. He has overseen, acquired and constructed over 20,000 MW of conventional and renewable generation assets. The enterprises led by Kellerman have produced a cumulative profit of over $6.5 billion.

Most recently, he was founder and CEO of Quantum Utility Generation, a private equity-funded, independent power generation company. Previously, Kellerman was Partner at Goldman Sachs and President of the firm’s electric power business, where he built operations from the ground up and led a wide range of investments for the firm, including cleantech and smart grid initiatives.

Earlier in his career, Kellerman served as Sr. Managing Director at El Paso Corporation, where he developed a 6,000 MW fleet of highly profitable North American power generation assets.  He was founding President of Citizens Power, the nation’s first independent power marketing enterprise, from start-up through its eventual high-value sale. He began his career with electric utilities Southern California Edison and Portland General Electric, where he became General Manager of Power Supply and Power Marketing.

He holds a BA, Management, from the University of California, Davis (cum laude, Phi Beta Kappa) and an MBA from West Coast University, Los Angeles (summa cum laude).


Hayes Nuss

Hayes Nuss is Partner, Finance & Operations at Twenty First Century Utilities. Nuss has nearly two decades of experience in finance, investments and risk management. Previously, he was a Partner and Managing Director at Strategic Investment Group, an investment management firm with $32 billion under management. There he was responsible for client investment policies where he worked with clients to develop investment strategies that aligned with their business risks and objectives. He managed the teams responsible for investment analytics and risk, led the redesign of front and back office systems, and conceived new methods to assess portfolio risk across multiple asset classes. He began his career as a naval architect on Department of Defense projects, focusing on the forensic analysis of structural failures in ships. He holds a BS, Aerospace Engineering, from Virginia Tech, an ME, Mechanical Engineering, from the University of Virginia, and an MBA from the Wharton School at the University of Pennsylvania.



Todd M. Raba

Todd M. Raba is Partner, Utility Management at GridPoint’s Twenty First Century Utilities. Raba has more than 30 years of experience leading large, highly competitive organizations to success. He was most recently President and CEO of GridPoint, where he oversaw strategy and operations. Previously, Raba was Chairman, President and CEO of Johns Manville (A Berkshire Hathaway Company), a $2.5 billion global manufacturer and marketer of premium-quality building products with over 6,500 employees.  In that role he reported directly to Warren Buffett. Raba also served as President of the MidAmerican Energy Company (a Berkshire Hathaway Company), Iowa’s largest electric and gas utility, with revenues in excess of $3.2 billion and more than 3,500 employees. Prior to MidAmerican, he was Regional Vice President of Rollins Environmental Services. Raba holds a BS, Forestry from the University of Vermont.



Robbie Diamond

Robbie Diamond is the Founder, President and CEO of Securing America’s Future Energy (SAFE). In 2006, he came together with Frederick W. Smith, Chairman, President, and CEO of FedEx Corporation, and General P.X. Kelley, USMC (Ret.), 28th Commandant of the Marine Corps, to form SAFE’s Energy Security Leadership Council, a group of prominent business leaders and retired senior military officers dedicated to combating the nation’s dangerous dependence on oil. Since then, SAFE and the ESLC have been at the forefront of the energy policy debate, successfully helping to shape legislation in 2007 and shepherd a new, comprehensive energy bill through the Senate Energy Committee in 2009.

Diamond is also the President and CEO of the Electrification Coalition, a nonpartisan, not-for-profit group of business leaders committed to promoting policies and actions that facilitate the deployment of electric vehicles on a mass scale. The Electrification Coalition is the lead implementation partner for Vulcan Inc. in the Smart City Challenge which recently selected Columbus, OH as the winner.

Diamond earned an Honours Bachelor of Arts from the University of Toronto in Peace and Conflict Studies and Political Science, as well as a Master of Arts in Law and Diplomacy from The Fletcher School.