Ballpark Lab

Solar

What solar really costs in 2026 — after the federal residential tax credit (Section 25D) expired. Honest payback math, lease vs. buy, and system sizing, with free calculators that show their work.

The 30% federal residential solar credit expired on December 31, 2025, so cash and loan buyers now get $0 in federal incentives — a change that reshapes payback math in every state. The calculators below estimate price, production, and break-even in your browser; the guides explain the trade-offs from first research to signing a contract.

Calculators

3 TOOLS

Free, no-email estimates computed in your browser from per-state data — with every assumption listed.

Solar guides

11 GUIDES · 7 TOPICS

Evergreen explainers grouped by topic and ordered from “just researching” to “ready to buy.”

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SOLAR DATA UPDATED JUNE 30, 2026