Utility Rate Analysis Calculator

Analyze electricity utility rate structures to determine the value of solar generation under different tariff types.

Input Parameters

Results

--
Monthly Bill (No Solar)
$
--
Average Rate
$/kWh
--
Marginal Rate
$/kWh
--
Solar Value at Marginal
$/kWh
Note: Solar offsets the highest-cost tier first, making the marginal rate the best measure of solar value. Tiered rates reward solar more than flat rates for high-usage customers.

Reference

Tier 1 Cost = min(Usage, 500) x Tier 1 Rate Tier 2 Cost = min(max(Usage-500, 0), 500) x Tier 2 Rate Tier 3 Cost = max(Usage-1000, 0) x Tier 3 Rate Monthly Bill = Base + Tier 1 + Tier 2 + Tier 3 Solar Value = Marginal Rate (highest tier offset first)