About Solar ROI Calculator

Our Mission

Help homeowners make informed solar panel decisions using real data from the National Renewable Energy Laboratory and the Energy Information Administration — not installer sales pitches.

Data Sources

All data on this site comes from authoritative, publicly available sources:

• NREL PVWatts API — primary data source
• EIA Electricity Data

We do not manufacture or estimate data. Every figure comes directly from the source APIs or published datasets. See our detailed methodology article for full details.

Who We Are

We are a small team of data engineers and web developers who believe that government-collected public data should be accessible to everyone — not locked behind paywalls or buried in PDFs.

We build data-driven tools that surface useful insights from free public datasets: Census data, BLS statistics, NREL energy research, USDA nutrition databases, NPS park information, and more.

Data Accuracy

We update our data regularly from the source APIs. While we strive for accuracy, this site is intended for general reference purposes and should not be used as the sole basis for major financial or safety decisions.

For official data, always verify directly at the source:

• NREL PVWatts API
• EIA Electricity Data