Growth Equity for the New Energy Industry

Lime Rock New Energy partners with entrepreneurs and management teams to bring private equity capital and value-adding partnership to growing companies across the new energy economy.


We bring our dedicated sector focus, deep industry and sector expertise, and true partnership to help leaders in the new energy economy grow profits, operations, and market share.

Our senior investment team averages more than 20 years each of experience in energy and general investing, operations, and new energy innovation. The team is supported by an Advisory Board that includes global leaders in new energy technology, policy, and executive leadership in the transition to a low-carbon energy economy.

In partnering with entrepreneurs that are leading growing businesses, we seek to accelerate their companies’ growth with capital, strategic execution and process experience, and Lime Rock New Energy’s deep network of relationships across all facets of the new energy economy.


We are exclusively focused on companies that help their customers produce or consume energy with a measurable, positive environmental impact. We are particularly focused on companies that provide products and services for:

The renewable energy industry
Energy efficiency for industry and the built environment
The decarbonization of transportation

Our focus is on North American companies and global companies with a commitment to the North American market.

We are focused on providing true growth capital to new energy companies—not venture capital or project finance. We seek to partner with companies that have a track record of commercial success by profitably delivering products and/or services to their customers and have a clear plan to grow revenue, profitability, and market share.

We seek to bring our experience to help companies grow. We want to partner with entrepreneurs that believe their business can gain a competitive edge with a value-adding investment partner.


We are investors, executives, policy leaders, and scientists with experience across the energy and new energy economies.


We came together to help growing companies achieve their potential and to be a catalyst for a rapid—and profitable—transition to a new, lower-carbon economy in the United States and globally.

We bring more than 20 years of experience partnering with growing, innovative energy companies at Lime Rock Partners, where we have been providing growth capital to the energy industry since 1998.

Lime Rock New Energy’s Advisory Board includes some of the world’s preeminent energy and sustainability experts who are engaged and active with all aspects of our investment process from initial evaluation through to ongoing portfolio company support.



Smart Wires Raleigh-Durham, NC
Electric Power Engineers Austin, TX


Qmerit Irvine, CA

Mark Lewis Discusses Lime Rock New Energy’s Unique Investment Approach on the “Entrepreneurs for Impact” Podcast

Mark Lewis and Mark McCall Discuss Lime Rock New Energy and How Innovative and Entrepreneurial Businesses Are Driving the Energy Transition on the Impact Capital Managers "Better Money Better World" Podcast

Mark McCall Discusses Renewable Energy Investment on FEG’s Insight Bridge Podcast

Conversation with Former Secretary of Energy Dr. Ernest Moniz on Energy Policy in the Biden Administration

Reach Out to Us

274 Riverside Avenue, Suite 3
Westport, CT 06880

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