Lime Rock New Energy Acquires Controlling Stake in Electric Power Engineers (EPE)

Berkshire Partners Makes Strategic Growth Investment in Electric Power Engineers

January 7, 2025

Energy

Electric Power Engineers (EPE), an Austin-based power systems engineering and consulting firm, received a strategic growth investment from Boston-based private equity firm Berkshire Partners. Lime Rock New Energy, the prior investor from 2021, has fully realized its investment; EPE management will remain significant investors and continue to lead the company. Advisory firms on the transaction were AEC Advisors for EPE and Houlihan Lokey for Berkshire.

Electric Power Engineers Acquires Estudios Eléctricos

January 29, 2026

Energy

Electric Power Engineers (EPE), a global advisory and engineering firm headquartered in Austin, Texas, has acquired Estudios Eléctricos, a South American power systems engineering firm founded in Argentina with teams in Argentina, Chile and Colombia. The acquisition expands EPE's grid-planning and software-enabled capabilities across Latin America and advances the firm's regional presence and service offerings to utilities, developers, data centers and public-sector clients.

Lime Rock New Energy Makes Growth Investment in Hawk Line Construction

November 18, 2025

Utilities

Funds managed by Lime Rock New Energy have made a growth investment in Hawk Line Construction to provide capital and strategic resources for expanding the company’s service capabilities and geographic reach. Hawk’s co-owners and leadership will remain in place and retain significant ownership; financial terms were not disclosed.

Keystone Capital Acquires Lane Power & Energy Solutions, Inc.

October 1, 2019

Oil & Gas

Keystone Capital has completed the acquisition of Lane Power & Energy Solutions, Inc. (LPES), a Houston-based provider of underground hydrocarbon storage and turnkey EPC services for petrochemical, midstream and government customers. Keystone said it will partner with LPES management to expand capabilities, broaden service offerings and grow organically and via targeted acquisitions; transaction terms were not disclosed.

Intervala (Primerock Portfolio) Acquires EPE Corporation

February 28, 2022

Manufacturing

Intervala LLC, a Primerock Capital portfolio company, has acquired EPE Corporation of Manchester, New Hampshire. The add-on expands Intervala's manufacturing capacity and capabilities in the U.S. Northeast—increasing total operating space and bringing on top-tier defense and other high-reliability customers—while former EPE CEO James D. (JD) Bell Jr. joins Intervala as vice president and general manager for the region.

Energy Capital Partners Acquires Majority Interest in PROENERGY

September 5, 2024

Energy

Energy Capital Partners (ECP) has acquired a majority interest in PROENERGY Holdings, a vertically integrated aeroderivative gas turbine platform with a 2.4 GW fleet of contracted peakers and global turbine services. The transaction (terms not disclosed) transfers control from affiliates of Eos Partners and ACON Investments to ECP, which will support PROENERGY's platform expansion, growth initiatives, and continued operations under existing leadership.