The 10 Largest Companies That Build Solar Farms in the United States

Corporate power-purchase agreements, federal incentives, and a steady stream of repowering projects — those three forces are reshaping U.S. utility-scale solar in 2026. This directory cuts through the noise and shows exactly which builders are putting the most steel in the ground. The ten firms below are the largest companies that build solar farms in the country, ranked purely by numbers: confirmed installed capacity and active project pipeline through the first half of the year.

How We Ranked the Top Companies That Build Solar Farms

Three Weighted Metrics

Each of these metrics carried equal weight:

• cumulative solar capacity commissioned in the United States through mid‑2026, measured in megawatts;
• the ownership pipeline of utility‑scale projects that hold signed interconnection agreements or are already under construction;
• whether the company served as the engineering, procurement, and construction (EPC) contractor or integrated developer‑builder on sites larger than 100 MW.

Pure asset owners — firms that hold the paper but never turn a wrench — were excluded. This is a list of builders, not portfolio managers.

Data Audit and Attribution

Ranking data was cross‑referenced against FERC filings, state public utility commission dockets, and the U.S. Energy Information Administration’s generator inventories. Where a developer operates through multiple subsidiaries, capacity is attributed to the ultimate parent entity. All figures are reported in megawatts of photovoltaic direct‑current nameplate capacity unless otherwise noted.

The 10 Largest Companies That Build Solar Farms in the US, 2026

The ten builders below lead the nation in completed utility-scale solar capacity and active project pipelines. For verified MW figures and full company dossiers, download the complete 2026 directory at the end of this article.

Rank	Builder Type	Self‑performs EPC?	Key Regions	What Sets Them Apart
1	Integrated developer & EPC	Yes	Southwest, Texas, California	Largest installed base; extensive PPA portfolio with creditworthy offtakers
2	Developer with in‑house construction	Yes	Southeast, PJM	Rapid scaling of bifacial tracker systems; repowering specialist
3	EPC contractor	Yes	National	Deep interconnection expertise; preferred contractor for major IPPs
4	Developer	No (preferred EPC partners)	CAISO, WECC	Pioneered 400 MW+ single‑site projects in California
5	EPC & O&M provider	Yes	MISO, SPP	Known for aggressive construction schedules and cold‑weather execution
6	Developer‑EPC	Yes	ERCOT, Southwest	Strong land acquisition network; long‑term O&M contracts
7	EPC	Yes	PJM, NYISO	Experience with brownfield and dual‑use (agrivoltaic) sites
8	Developer	No (preferred EPC partners)	Southeast, Mid‑Atlantic	Community solar focus; 20‑50 MW AC portfolio specialist
9	EPC	Yes	Western US	Module‑agnostic; excels at high‑altitude and remote terrain
10	Developer‑EPC	Yes	Florida, Carolinas	Resilient construction practices for hurricane‑prone regions

This table mirrors the type of analysis found in the full directory. Actual rankings rely on cumulative installed MWdc and active pipeline as described in the methodology.

Choosing the Right Solar Farm Builder: Key Considerations

Selecting a construction partner for a utility-scale project goes far beyond the top‑ten list. Developers, asset owners, and financing parties typically evaluate builders against several practical yardsticks.

Turnkey vs. EPC‑Only: Match Your Needs

If your team owns the land, permits, and offtake agreements but lacks in‑house construction capabilities, a full‑service developer‑EPC delivers a complete plant. When you already have a development group and only need execution, a pure EPC contractor often offers more competitive pricing and flexible contract structures.

Common Mistake When Vetting Builders

A frequent misstep is choosing a builder based on a strong national track record without verifying their experience in the specific ISO or RTO where the project will interconnect. Grid interconnection rules, labor availability, and local permitting timelines vary sharply between PJM, ERCOT, MISO, and CAISO. Always request detailed references from projects in the same region and of comparable scale.

Construction Timeline Realities

A 200 MW single‑site solar farm typically requires 12 to 18 months of active construction after notice to proceed, not including early‑stage site work, procurement lead times for transformers and switchgear, or commissioning and performance testing. Builders that self‑perform civil and medium‑voltage work can often compress schedules by two to four months, assuming favorable weather and supply chain conditions.

Quick EPC Vetting Checklist

Use this table when shortlisting contractors:

Criteria	What to Verify
Regional experience	At least three projects over 100 MW in the target ISO
Self‑performance capability	In‑house civil, pile driving, and MV electrical crews
Module and tracker relationships	Established supply agreements with major OEMs
Performance guarantees	Contractual energy output guarantees and liquidated damages structure
O&M transition plan	Process for handing over the plant to a long‑term operations team

Download the Complete 2026 Solar Farm Builders Directory

The full 2026 Solar Farm Builders Directory contains verified installed‑capacity figures, pipeline totals, founding years, key project names, and operational leader summaries for all ten ranked builders, plus profiles of 90 more developers and EPCs operating in the United States. The package includes an Excel dataset and a PDF report.