Resource Comparison Proxy Export Rate

What is the Resource Comparison Proxy Export Rate?

The Resource Comparison Proxy (RCP) export rate is used to calculate compensation for excess power produced by customers’ private rooftop solar systems. The Arizona Corporation Commission (ACC) approved use of the RCP for residential and small commercial customers who have requested interconnection since September 20, 2018.

The rate is based on average market costs for solar energy over a recent five-year period. The rate is usually adjusted annually, but customers are compensated for up to 10 years at the RCP export rate in place at the time they requested interconnection of a new solar power system. Because solar energy prices have fallen over time, this rule has allowed customers to preserve higher export rate benefits.

What is the current RCP?

The current energy export rate of $0.1035 per kWh, effective October 1, 2019, will continue through September 30, 2021. The ACC voted in September 2020 to leave the current rate in place for an additional year, citing a reluctance to reduce solar power incentives during the coronavirus pandemic.

Can the RCP change?

Rules approved by the ACC call for annual updates to the export rate to reflect market prices for solar power. However, the RCP will not be allowed to fall more than 10 percent annually.

How does the RCP appear on my monthly bill?

The RCP appears under the heading “Excess Generation Credit” in the Power Supply Charges section. Meanwhile, the cost UniSource incurs to pay the RCP is passed along to customers through the Purchased Power and Fuel Adjustment Charge (PPFAC) and the Renewable Energy Standard and Tariff (REST) charge.