Live: https://worthcrunchhq.github.io/
A free, 100% client-side calculator that estimates home-solar cost, payback period, and 25-year savings — updated for 2026, after the U.S. federal residential solar tax credit (Section 25D) expired for systems placed in service after Dec 31, 2025. Most calculators online still bake in the old 30% credit and now show the wrong numbers; this one models the post-credit reality (cash / loan / lease / PPA), by state, with every assumption visible and editable — and no email, no signup, no tracking of your inputs.
- 🧮 Calculator: https://worthcrunchhq.github.io/
- 🗺️ Solar payback by state (all 50 + DC): https://worthcrunchhq.github.io/solar/
- 📄 Guides: 2026 federal tax credit · lease vs buy vs PPA
data/solar-by-state-2026.json — estimated 2026 solar cost, payback, and 25-year savings for all
50 states + DC (average home, cash purchase), plus the underlying peak-sun-hours and average
electricity rates. Free to reuse with attribution / a link back to WorthCrunch.
GET https://worthcrunchhq.github.io/data/solar-by-state-2026.json
Useful for journalists, bloggers, and researchers covering the 2026 solar tax-credit change.
annual production ≈ system_kW × peak_sun_hours × 365 × 0.83 derate × shading, sized to offset ~100%
of usage; net cost after incentives (federal = $0 for 2026 cash/loan); savings grown 3%/yr for
electricity inflation, reduced 0.5%/yr for panel degradation; payback = year cumulative savings exceed
net cost. Full methodology on the site. Estimates use state-average data — a transparent ballpark,
not an engineering quote.
Static HTML/CSS/JS, no build step, no backend, hosted free on GitHub Pages. Data and pages are
generated by build/gen-states.js.
Estimates only, not financial advice. © 2026 WorthCrunch.