The Trump administration’s "big beautiful bill" sparked a late-summer flurry for new residential solar systems on Long Island as homeowners scrambled to take advantage of an expiring tax credit that covers a third of system costs.

But with a potentially record-setting 2025 coming to a close, Long Island’s perennially adaptive solar installers are facing a big new challenge: how to make up for a big chunk of lost sales some are predicting for 2026 after the federal tax credit goes away at the end of this year.

Many solar companies saw their applications for new systems soar from July through September after the bill was passed, according to figures from PSEG and dealers, and installers are now rushing to get systems completed by Dec. 31 so that customers are eligible for the expiring 30%

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