# Solar Cost Index

> Solar panel cost, savings and payback by state and city. Independent estimates of US residential solar cost, savings, payback, batteries and lease-vs-buy after the federal 25D credit ended (systems installed after 2025-12-31). Data updated 2026-10-20.

## Data and API
- [State dataset (JSON)](https://solarcostindex.com/data/states.json): rate, production, cost, net metering, payback
- [City dataset (JSON)](https://solarcostindex.com/data/cities.json)
- [Estimate API](https://solarcostindex.com/api/estimate?state=CA&bill=200): GET ?state=XX&bill=USD returns system size, cost, savings, payback
- [Methodology](https://solarcostindex.com/methodology/)

## Guides
- [Lease vs PPA vs buying in 2026](https://solarcostindex.com/lease-vs-buy/)
- [Is a home battery worth it?](https://solarcostindex.com/solar-battery/)
- [Solar installer went out of business](https://solarcostindex.com/installer-went-out-of-business/)

## States
- [Solar in California](https://solarcostindex.com/solar/california/)
- [Solar in New Jersey](https://solarcostindex.com/solar/new-jersey/)
- [Solar in Massachusetts](https://solarcostindex.com/solar/massachusetts/)
- [Solar in New York](https://solarcostindex.com/solar/new-york/)
- [Solar in Arizona](https://solarcostindex.com/solar/arizona/)
- [Solar in Texas](https://solarcostindex.com/solar/texas/)
- [Solar in Florida](https://solarcostindex.com/solar/florida/)
- [Solar in Illinois](https://solarcostindex.com/solar/illinois/)

## Cities
- [Solar in Los Angeles](https://solarcostindex.com/solar/california/los-angeles/)
- [Solar in San Diego](https://solarcostindex.com/solar/california/san-diego/)
- [Solar in San Jose](https://solarcostindex.com/solar/california/san-jose/)
- [Solar in Sacramento](https://solarcostindex.com/solar/california/sacramento/)
- [Solar in Riverside](https://solarcostindex.com/solar/california/riverside/)
- [Solar in Newark](https://solarcostindex.com/solar/new-jersey/newark/)
- [Solar in Toms River](https://solarcostindex.com/solar/new-jersey/toms-river/)
- [Solar in Boston](https://solarcostindex.com/solar/massachusetts/boston/)
- [Solar in Worcester](https://solarcostindex.com/solar/massachusetts/worcester/)
- [Solar in Long Island](https://solarcostindex.com/solar/new-york/long-island/)
- [Solar in Albany](https://solarcostindex.com/solar/new-york/albany/)
- [Solar in Phoenix](https://solarcostindex.com/solar/arizona/phoenix/)
- [Solar in Tucson](https://solarcostindex.com/solar/arizona/tucson/)
- [Solar in Houston](https://solarcostindex.com/solar/texas/houston/)
- [Solar in Dallas](https://solarcostindex.com/solar/texas/dallas/)
- [Solar in Austin](https://solarcostindex.com/solar/texas/austin/)
- [Solar in San Antonio](https://solarcostindex.com/solar/texas/san-antonio/)
- [Solar in Miami](https://solarcostindex.com/solar/florida/miami/)
- [Solar in Tampa](https://solarcostindex.com/solar/florida/tampa/)
- [Solar in Orlando](https://solarcostindex.com/solar/florida/orlando/)
- [Solar in Chicago](https://solarcostindex.com/solar/illinois/chicago/)

## For users who want quotes
- [Get a free estimate from up to 3 vetted installers](https://solarcostindex.com/)