Solar Cost Estimator

Written & reviewed by

EnergyTools Research Team — Solar Energy Research Group

The EnergyTools Research Team compiles and verifies residential solar data from NREL, EPA, and state utility commissions. Methodology is reviewed quarterly.

• Source data: NREL PVWatts V8 + Utility Rates V3 APIs
• Source data: EPA FuelEconomy.gov vehicle efficiency data
• Methodology reviewed quarterly

Methodology & data sources:NREL PVWatts, EPA FuelEconomy.gov, state utility commissions— updated 2026.