Free Electricity Rate API

Read-only JSON endpoints over our cleaned, monthly-refreshed dataset. Free for personal & commercial use, no key required, no rate limit (we’re behind a CDN-friendly static cache).

All-states rates

GET https://wattprice.io/api/rates.json

Returns: data_period, U.S. average, and a map of USPS state code → residential rate in cents/kWh.

Per-state endpoint

GET https://wattprice.io/api/rates/CA.json

Returns: residential rate, peak sun hours, residential natural gas price, and applicable data periods.

Example

curl https://wattprice.io/api/rates/TX.json
{
  "state": "TX",
  "name": "Texas",
  "residential_rate_cents_per_kwh": 16.99,
  "peak_sun_hours_per_day": 5.2,
  "residential_gas_price_dollars_per_mcf": 24.61,
  ...
}

Data sources & license

• Electricity rates: EIA Electric Power Monthly Table 5.6.A
• Natural gas prices: EIA Natural Gas Monthly
• Peak sun hours: NREL PVWatts
• Underlying data is U.S. government public domain. Attribution to wattprice.io is appreciated but not required.

Freshness

Both electricity and natural-gas datasets refresh automatically on the 23rd of each month from EIA’s monthly publications.