Solar Tax Credits: The Engine Behind a Trillion-Dollar Buildout

Gregory Chassapis

Jul 2

3 min read

Updated: Jul 28

Tax credits can be an important prerequisite for self-sustaining industry. For domestic solar, two decades of federal support built the cost structure the market now takes for granted, and the 2025 rewrite of that support is reshaping the back half of a decade that promised to make it self-sustaining.

Rethinking Tax Credits

On July 4, 2025, the One Big Beautiful Bill Act (OBBBA) altered the federal incentive stack for clean energy, terminating some credits outright, accelerating sunsets on others, and adding sourcing guardrails.

Under the OBBBA, Section 48E (the 30% Investment Tax Credit for utility-scale projects) remains available, but only if construction begins before July 4, 2026. Projects that clear that deadline have roughly four years under standard safe-harbor rules to reach commercial operation. Projects that start later must be placed in service by December 31, 2027. The result is a record-setting buildout of 86 gigawatts of new utility-scale capacity that is expected to come online over the next two years with even more (approximately 216-240 gigawatts total) expected to be deployed by the end of the decade. That’s enough to double the deployed capacity to date, and because utility-scale projects typically take several years to move from construction start to commercial operation, that safe-harbored pipeline is essentially the inventory that will sustain U.S. utility-scale solar deployment through 2030.

Residential solar is another matter entirely.

Section 25D, the 30% credit that homeowners have claimed on rooftop systems for years, was terminated entirely as of December 31, 2025, meaning cash and loan-financed residential solar in 2026 receives zero federal credit, thereby fundamentally altering the economics and the mechanics of this sector for the foreseeable future. Forecasts estimate an 18% decline in residential installations this year because of this, but third party-owned systems (leases and PPAs that qualify through Section 48E) continue to qualify and are absorbing share.

The real story, however, is Section 45, otherwise known as the Advanced Manufacturing Production Credit.

45X pays domestic producers per unit of output for solar cells, wafers, modules, polysilicon, inverters, batteries, and critical minerals, and the OBBBA largely preserved it, but with a few caveats. Introduced were the "specified foreign entity" and "foreign-influenced entity" restrictions that exclude Chinese-controlled producers from receiving tax benefits under OBBA and subjected manufacturers to a Material Assistance Cost Ratio test to determine how much of a component is sourced from a foreign entity. Too large a percentage and the component would not receive the benefit.

The desired effect is a tax-advantaged tailwind for the rebuild of the American solar supply chain.

The Near-Term Outlook

Solar plus storage is the cheapest, fastest-to-deploy incremental generation available, with battery prices having fallen to roughly $117 per kilowatt-hour, less than a third of 2023 levels. Even without credits, unsubsidized solar is competitive in most resource-rich markets. With the remaining credits, it can be dominant.

After the dust settles in 2027, most people expect a recovery, as domestic 45X-eligible manufacturers sit on tax-advantaged margins and safe-harbored utility-scale developers have effectively locked in the 30 percent ITC through the back end of the decade.

What is striking about that outlook is how little of it actually depends on Washington. Corporate procurement, hyperscaler power contracts, and utility resource plans continue to point in the same direction, whatever the tax code does year to year. Private industry has already made the decision to integrate renewables into the energy stack of the future. What has happened with the OBBBA is a shift in how the energy security doctrine is being applied in conjunction with an accelerated timeline for deployment.

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