Terra-Gen (independent renewable energy power producer) has announced that its Lockhart III solar project in San Bernardino County, California, has reached commercial operations, adding 125 megawatts of renewable capacity to the state's power grid and marking the latest expansion of a multi-phase solar complex in the Mojave Desert region.

Project Details and Grid Connection

The 125-MW facility uses an existing gen-tie line connecting to Southern California Edison's Kramer Junction Substation, avoiding the need to construct new transmission infrastructure for the project. Terra-Gen said the plant will generate enough electricity to power the equivalent of approximately 62,500 homes and businesses annually.

Capacity from the project has been contracted under long-term agreements with corporate buyers and California load serving entities, securing a revenue base for the facility over its operational life.

John O'Connor, chief executive officer for Terra-Gen, said the project reflects the company's ongoing commitment to expanding clean energy resources in California.

"The expansion of the Lockhart project underscores Terra-Gen's commitment to continue developing clean, reliable energy resources critical to meeting the growing demand in California and nationwide," O'Connor said.

"We are proud to bring more resources online that can help relieve strain and improve reliability across the electric grid to keep lights on at homes, and businesses and manufacturing running."

Construction Workforce and Safety Record

Construction of Lockhart III created more than 370 jobs at peak activity. Workers collectively completed approximately 260,000 hours on the project with no lost-time incidents recorded, a safety outcome Terra-Gen highlighted in its announcement of the commercial operations milestone.

Fourth Phase Already Under Construction

Lockhart III is not the final chapter for the site. Terra-Gen is already building a fourth phase of the Lockhart solar project at the same location. That next addition is expected to begin commercial operations in the third quarter of 2026 and will contribute an additional 80 MW of generating capacity to the energy complex, bringing the total planned buildout of the multi-phase project to more than 200 MW once Lockhart IV is complete.

The phased development approach at the Lockhart site reflects a pattern common among large-scale solar developers in California, where shared infrastructure such as gen-tie lines and substation connections can reduce costs and permitting complexity when expanding an existing facility.

Terra-Gen's Broader Portfolio

Terra-Gen describes itself as one of the largest independent, integrated renewable energy producers in the United States. The company's gross operating portfolio comprises 4.2 gigawatts of wind, solar, and battery storage projects, including 5.6 gigawatt-hours of energy storage facilities across 33 renewable power sites throughout the country.

The company's projects are concentrated predominantly in California and Texas. Terra-Gen is jointly owned by Masdar, the Abu Dhabi Future Energy Company, and Igneo Infrastructure Partners, a global infrastructure investment manager.

About the Owners

Masdar was established in 2006 and is jointly owned by TAQA, ADNOC, and Mubadala. The company describes its portfolio as totaling over 65 gigawatts across six continents and has set a target of reaching 100 GW of portfolio capacity by 2030.

Masdar has been an active acquirer and developer of renewable energy assets in the United States, and its co-ownership of Terra-Gen places it among the significant players in the domestic utility-scale renewables market.

Igneo Infrastructure Partners operates as an autonomous investment team within the First Sentier Group. The firm invests in what it describes as high-quality, mature, mid-market infrastructure companies across sectors, including renewables, digital infrastructure, waste management, water utilities, and transportation and logistics. 

Igneo operates in markets spanning the United Kingdom, Europe, North America, Australia, and New Zealand, and has been active since 1994. As of March 31, 2026, Igneo manages approximately 24.5 billion dollars in assets on behalf of more than 200 investors worldwide.

California Grid Context

The Lockhart III announcement comes as California continues to push toward its renewable energy and grid reliability goals. The state has faced recurring concerns about grid strain during peak demand periods, particularly during summer heat events.

O'Connor's comments pointed specifically to grid reliability as a motivation for bringing additional generating capacity online, noting the importance of resources that can help reduce pressure on the broader electric system.

The use of the existing Kramer Junction Substation connection for Lockhart III, and presumably for the forthcoming Lockhart IV, positions the complex to feed power into a part of the Southern California Edison service territory that has historically hosted significant renewable energy development, given its solar resource characteristics.

With Lockhart IV expected to enter service by the end of the third quarter of 2026, Terra-Gen's buildout at the San Bernardino County site is set to continue adding to California's renewable generation capacity through the remainder of the year.

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