Methodology

Data Sources

Grintyd derives every published rate, incentive, and production assumption from primary government and regulatory publications. We do not aggregate from secondary blog or marketing sources.

Primary sources

U.S. Energy Information Administration (EIA)
Residential utility rate benchmarks by state and utility territory
Refresh: Quarterly
National Renewable Energy Laboratory (NREL)
Peak-sun-hours, irradiance, and production modeling inputs
Refresh: Annual
DSIRE (NC Clean Energy Technology Center)
State and utility-level solar incentive programs
Refresh: Quarterly
State Public Utility Commissions
Approved tariff schedules and net-metering rules
Refresh: On tariff filing
Federal IRS / Department of Energy
Federal Residential Clean Energy Credit (ITC) eligibility
Refresh: On rulemaking

Source citations and the retrieval date for each figure are visible on the relevant metro page. Report a discrepancy to corrections@grintyd.com.