2026 Top Solar EPCs: What the Real List Shows

What the 2026 Top Solar EPCs List Actually Measures

Solar Power World's 2026 Top Solar EPCs list ranks 107 companies, sorted by kilowatts (DC) installed in the United States in 2025, as the publication states in its own description of the sublist. That single sentence carries three constraints an EPC needs before using the number for anything: the measure is US-only, so overseas work does not count; it is DC, not AC; and it is calendar-year 2025, which means the "2026" list is really a report card on the year before. The overall methodology page confirms the same rule for the full Top Solar Contractors list the EPC sublist is drawn from: "Ranks are determined by the number of kilowatts (DC) a company was involved with installing in 2025 in the United States only."

This is the 15th annual edition of the list, according to Solar Power World's launch announcement in July 2026, which the publisher describes as the industry's most recognized grouping of solar and storage installation companies — its own characterization of its own product, not an independent finding.

The critical mechanic sits in how a company gets onto the list at all. Firms apply, and as part of that application they choose one of six primary service categories: EPC, developer, solar installer, installation subcontractor, electrical subcontractor or sales partner. Whichever one they pick determines which sublist they show up on. It does not determine, or even constrain, what work actually produced their kilowatt total.

Reading the Label: What "EPC" Does and Doesn't Tell You

The single most important sentence on the EPC sublist is the one most readers skip past. Solar Power World states it directly: "These companies chose their primary service as 'EPC' when applying to the list, and they may also work as developers, installers, electrical subcontractors, installation subcontractors and sales partners. The listed kilowatts installed by each company could be performed within multiple services and not just EPC work." A company sitting at rank 30 on the EPC list may have booked a meaningful share of that volume as an installation subcontractor on someone else's project, not as the lead EPC. The label tells you what the company called itself. It does not tell you what role it played on the jobs that produced the number next to its name.

Utility-Scale Firms Own the Top of the List

The top four positions on the 2026 EPC sublist — Quanta, Moss, McCarthy and Primoris — are all tagged "U" for utility, meaning their reported kilowatts landed in the utility market. That tag is itself a market designation assigned by where the kilowatts were installed, not a description of the whole company; a firm marked "U" is not barred from other markets, it simply reported its installed volume there.

Mortenson is a useful case study in how a company's own framing can diverge from the list's mechanics without contradicting it. In its own announcement about its 2026 ranking, the company says it "was involved in installing nearly 2 gigawatts of solar capacity and 6 gigawatt-hours of storage across the United States" in 2025, and that it ranked No. 1 for energy storage on a companion list. Mortenson also cites a lifetime total of more than 17 GW of solar and more than 15 GWh of storage across 17 years in solar and 11 years in storage — a cumulative, self-reported figure that has nothing to do with the single-year kilowatt number the Top Solar Contractors list actually ranks on. Reading a company's own press release alongside its list rank is fine; treating the two figures as interchangeable is not.

The Installation-Subcontractor Effect

Three of the ten largest contractors overall in 2025 were not EPCs by primary service — all three were installation subcontractors (Sun Solar LLC at No. 6, Granite Industrial at No. 8, and Sukut Construction at No. 9). None of the top 10 was a developer. Sun Solar LLC, which ranked sixth on the overall Top Solar Contractors list with 1,811,643 kW, carries the primary-service label of installation subcontractor, not EPC. That single data point is the clearest evidence that "biggest volume" and "EPC" are two different sorts.

Developers Are a Separate, Much Smaller Roster

The developer sublist holds only 35 companies, a fraction of the 107 on the EPC sublist. That gap matches the class-wide split Solar Power World reported at launch: across the full 2026 Top Solar Contractors class, 27% of listees identify as EPCs, 51% are primarily non-utility-scale installers, 9% are developers, 12% are subcontractors, and 1% perform sales-only tasks. If a developer you work with, or compete against, does not appear on the developer sublist at all, that absence is not necessarily a sign of small scale — it may simply mean the firm applied under a different primary-service label, or did not apply.

Market Tags Measure Where the Kilowatts Landed, Not Where the Firm Works

Utility, commercial, community solar and residential tags on the list are assigned strictly by the kilowatts a company installed in that specific market — not by what markets the firm claims to operate in. A company can do meaningful commercial work and still show up tagged only "U" if that is where its 2025 kilowatts happened to land. This is worth remembering before dismissing a firm as "residential-only" or "utility-only" based on its market tag alone.

On experience, the list does support a real credibility signal: over 72% of listees report at least 10 years of experience in solar, and 58% report more than 15 years across solar, storage and energy construction combined. The geography is similarly stable — the top five states for installations among listees in 2026 were the same as the prior year: California, Illinois, Texas, New York and Pennsylvania.

The Deadline Stack That Will Define the 2027 List

The 2026 list is a snapshot of 2025. The events below happened, or were scheduled to happen, in 2026 — which means their effects will show up in next year's kilowatt totals, not this year's.

• January 1, 2026 — FEOC content requirements took effect, requiring at least 40% of a solar project's manufactured products and 55% of a storage project's to come from non-prohibited-foreign-entity sources, with the solar threshold rising to 60% for projects starting construction after 2029.
• February 6, 2026 — Section 201 tariffs on imported solar panels, in place for eight years, expired. Trade counsel for the Alliance for American Solar Manufacturing and Trade has called the remedy largely ineffective, citing the lengthy bifacial-product exemption and country carveouts such as Cambodia.
• February 23, 2026 — Preliminary countervailing duty determinations were expected in the India/Indonesia/Laos "Solar IV" trade case.
• March 27, 2026 — Preliminary antidumping determinations were due in the same Solar IV case.
• March 28, 2026 — The statutory deadline for the Section 232 polysilicon investigation's final report, with presidential concurrence due on or about June 26, 2026.
• April 1, 2026 — China's VAT export rebate on solar exports drops from 9% to 0%.
• July 4, 2026 — The commence-construction safe-harbor deadline for solar under the One Big Beautiful Bill. Projects that began construction within 12 months of the bill's enactment can safe-harbor the credit and still qualify if placed in service by mid-2030.

Grid-scale energy storage sits outside most of this: unlike solar and wind, it keeps its investment and production tax credits on their original schedule.

What EPCs Should Do With the List Right Now

• Read every rank against the primary-service label, not the position. A rival ranked above your firm on the EPC sublist may have earned much of that volume as a subcontractor or installer on someone else's contract — check the label before treating rank as a quality signal.
• Confirm your own FEOC documentation chain now. The 40% solar content threshold and its 20% penalty for a miscalculation that underpays tax by more than 1% fall on the taxpayer claiming the credit — but an EPC that can't produce clean sourcing documentation puts that taxpayer's calculation at risk.
• Retest safe-harbor status against the 5% cost or physical-work standard. Keith Martin, a partner at Norton Rose Fulbright, has said a project will likely need to incur at least 5% of its total cost, or begin physical work of a significant nature on site, to qualify — verify which test your pipeline actually clears rather than assuming July 4, 2026 activity was sufficient.
• Price transformer lead time into any 2026 pipeline benchmarking against peers. Medium-voltage lead times run up to a year and high-voltage lead times stretch two to four years.
• Use the developer sublist, not the EPC sublist, when vetting a development partner. Only 35 companies chose developer as their primary service, against 107 EPCs — an absence from that shorter list is not evidence of scale one way or the other.
• Treat the 2026 list as a 2025 baseline, not a current-year scorecard, when presenting your own ranking to a lender or developer — the number in the release is already a year old by the time it's published.

The Volume Behind the Rankings: 2025 in Context

The kilowatts on the 2026 list sit inside a much larger national total. The US solar industry installed 43 GW of new capacity in 2025, remaining the fastest-growing source of new electrical capacity added to the grid for a fifth consecutive year. Texas led all states with 11 GW of new installations, 11 states set new annual installation records, and 12 states added more than 1 GW — a different measure from the list's own state ranking, which counts only work performed by listees rather than total state additions.

That growth carried into 2026. The US added 7.8 GW of new solar capacity in the first quarter alone, and solar plus storage together made up 91% of all new US generating capacity added that quarter, as cumulative installations passed 6 million. Contracts for utility-scale solar rose 15% year over year, driven largely by tech companies securing power for AI-driven electricity demand — contracted volume that will show up as installed kilowatts, and therefore as list rank, only once those projects clear construction.

Whether that pace holds is the open question the deadline stack above bears directly on. Wood Mackenzie forecasts that US solar additions will be flat over the next five years, with permitting bottlenecks cited as the near-term constraint despite growing demand. A SEIA analysis found 457 solar and storage projects have permits pending and are vulnerable to politically motivated delays or cancellations — a pipeline that could move the 2027 rankings in either direction depending on how quickly those permits clear.

On the supply side, the picture has shifted toward domestic capacity. With a wafer manufacturing facility having opened in 2025, the US can now produce every major component of the solar supply chain domestically, and module manufacturing capacity grew more than 50% to 65.5 GW that year — capacity that matters directly for meeting the FEOC content thresholds now in effect, though nameplate capacity is not the same as compliant supply at volume. Storage tells a similar story: the US added a record 3.3 GW / 8.4 GWh of energy storage in the first quarter of 2026, with utility-scale, residential and commercial/community/industrial segments all setting first-quarter records, and utility-scale storage is expected to claim 85% of capacity additions through 2031. An industry group, the Energy Storage Coalition, said in March 2026 that US factories now have enough capacity to supply 100% of domestic storage demand — an industry claim, not an independently audited figure, but one worth weighing against how much of that capacity actually meets the FEOC thresholds a storage project now has to clear.

Frequently Asked Questions

Q1. Does ranking higher on the 2026 EPC list mean a company does better-quality work?

No. The list ranks purely on kilowatts (DC) installed in the US in 2025, and Solar Power World states directly that the kilowatts credited to a firm "could be performed within multiple services and not just EPC work." A higher rank means more volume passed through the company in some capacity that year — it says nothing about design quality, safety record, or how much of that volume the firm actually engineered and procured versus subcontracted into.

Q2. Why do Mortenson's own figures differ from what shows up elsewhere?

Mortenson's public statement cites "nearly 2 gigawatts" of solar and 6 GWh of storage installed in the US in 2025, plus a separate lifetime total of more than 17 GW of solar and more than 15 GWh of storage built up over 17 years in solar and 11 years in storage. The single-year figure is what feeds the list ranking; the lifetime figure is a cumulative, self-reported number that describes the company's whole history and should never be compared directly against another firm's one-year rank.

Q3. What's the actual difference between the EPC list and the developer list?

They are separate sublists built from the same applicant pool, split by each company's self-chosen primary service. The developer sublist has only 35 companies, against 107 on the EPC sublist, which lines up with the class-wide split Solar Power World reported: 9% of listees identify as developers versus 27% as EPCs. A firm can do substantial development work and still not appear on the developer list if it applied under a different label.

Q4. Does the "2026" list reflect 2026 construction activity?

No. Rank is determined by kilowatts DC installed in the United States in 2025, so the 2026 list is a report on the prior calendar year. This is the 15th edition of the list. Any 2026 activity — including projects hitting the July 4, 2026 safe-harbor deadline — will only show up in the 2027 list.

Q5. What happened at the July 4, 2026 safe-harbor deadline, and what does it mean for a project that missed it?

July 4, 2026 was the deadline for solar projects to have commenced construction within 12 months of the One Big Beautiful Bill's enactment in order to safe-harbor the tax credit and still qualify if placed in service by mid-2030. Keith Martin of Norton Rose Fulbright has indicated the bar for "commenced construction" likely required incurring at least 5% of total project cost, or beginning physical work of a significant nature on site. A project that missed that window faces a materially different tax-credit picture going forward, which is exactly the kind of shift that will separate firms in the 2027 rankings.

Q6. Are the Section 201 panel tariffs gone permanently now that they've expired?

The Section 201 tariffs themselves expired February 6, 2026 after eight years in place, but that is only one of several trade measures affecting imported panels. Antidumping and countervailing duty cases — including preliminary determinations expected February 23 and March 27, 2026 in the India/Indonesia/Laos case — and a separate Section 232 national-security investigation into polysilicon, with a statutory report deadline of March 28, 2026, remain live and separate from Section 201.

Q7. What are the FEOC content requirements and when did they actually start applying?

FEOC — prohibited foreign entity — content requirements took effect January 1, 2026. A solar project starting construction in 2026 needs at least 40% of its manufactured product content free of material assistance from prohibited entities, a threshold that rises to 60% for projects starting after 2029; storage carries a 55% threshold in 2026. A taxpayer that miscalculates the content ratio and underpays tax by more than 1% as a result faces a 20% penalty. Sourcing documentation for that calculation typically originates with the EPC or supplier, so gaps there put the taxpayer's calculation at risk.

Q8. Will all of this actually change who tops the 2027 list?

It's the most likely driver of change, though the exact effect isn't yet visible in the data — the 2026 list ends its measurement window in December 2025, before nearly all of these events took effect. What's already documented is the direction of pressure: Wood Mackenzie forecasts flat US solar additions over the next five years due to permitting bottlenecks even as demand grows, China's export rebate on solar drops to zero on April 1, 2026, and 457 projects with pending permits sit exposed to delay. Firms that cleared safe harbor by July 4, 2026 and have their FEOC sourcing documented are positioned very differently for the 2027 list than firms that didn't.

Sources

• Solar Power World — 2026 Top Solar EPCs
• Solar Power World — 2026 Top Solar Contractors
• Solar Power World — 2026 Top Solar Contractors List Launches
• Solar Power World — 2026 Top Solar Developers
• Solar Power World — Top Solar Contractors methodology
• Solar Power World — End of an Era: Section 201 Tariffs Expire
• Solar Power World — 2025 Year in Review (SEIA/Wood Mackenzie)
• pv magazine USA — What Utility-Scale Solar Developers Should Know About OBBBA
• Anza — Solar & Storage Procurement Outlook 2026
• Wood Mackenzie — Solar & Storage 91% of US New Power Capacity Q1 2026
• Utility Dive — US Sees Record Q1 2026 Energy Storage Installations
• Mortenson — Solar Power World 2026 Top Solar Contractors List