Methodology and data sources

Grid Shopper presents electricity supply offers from official state rateboards in a more organized and contextualized format. We add historical tracking, usage forecasting, and bill estimates to help consumers navigate their supply options.

Data sources

• Official state rateboard filings for fixed-price electricity supply offers
• Utility default service rates and procurement auction results
• Historical weather data and utility usage statistics for forecast modeling
• Public utility commission dockets and regulatory filings

Data processing

• Filter out variable-rate and introductory promotional offers
• Normalize monthly fees into displayed per-kWh rates (where applicable)
• Organize offers by contract term length for easier visualization
• Track rate changes over time to show market trends

Usage forecasting and bill estimates

• Forecast average residential usage based on historical patterns and weather data
• Combine forecasted usage with current utility rates to estimate monthly bills
• Show both supply and delivery components separately
• Update forecasts daily based on latest weather information

What we don’t do

• We don’t verify or audit rateboard data. We assume state rateboards reflect accurate supplier filings.
• We don’t rank or recommend suppliers. We organize and visualize data so you can make your own comparisons.
• We don’t guarantee rate accuracy. Rates change frequently. Always verify final terms on the official rateboard before signing up.