The numbers and assumptions included in some answers below are based on Idaho Power’s current service offering. Ongoing cases with the Idaho Public Utilities Commission (IPUC) could change the billing and compensation structure for on-site generation in the future. Existing on-site generation customers as of Dec. 20, 2019 have been grandfathered into the current offering by the IPUC.
Investments for homes in San Jose and Boise with identical energy use
|San Jose, California||Boise, Idaho|
|Average monthly electric use:||500 kWh||500 kWh|
|Average monthly bill:||$125||$45|
|System size to offset nearly 100% of use:||3.75 kW||3.75 kW|
|System net cost after tax credit:||$12,400||$8,400|
|Simple Savings1 Calculation|
|Estimated break even point:||8 years||17 years|
|Total 20 year payback:||$21,200||$950|
|NET PRESENT VALUE1 CALCULATION|
|Estimated break even point:||10 years||Beyond 20 years|
|Total 20 year payback:||$10,500||-$1,700|
Sources: Project Sunroof and PVWatts Calculator 1Find descriptions of simple savings and net present value under the question Why does Project Sunroof provide two different 20-year values? at idahopower.com/solar.
Idaho Power’s on-site generation tariffs are not contracts and are subject to change. The current rules do not represent a guarantee of future pricing. Modifications to the tariff’s billing or compensation structure, including measurement interval and the credit value of excess energy generation, will affect the amount a customer would be compensated. As stated in the Idaho Residential Energy System Disclosure Act, legislative or regulatory actions can affect or eliminate one’s ability to sell or get credit for any excess power generated by the system and may affect the price or value of that power.
Connecting Your System
Excess Energy Credit Transfers
- Excess energy credits must be available.
- Service agreements must be held by the customer and be for the customer’s use.
- Service agreements must be on the same contiguous property and be served by the same primary feeder as the customer generation (i.e., on-site generation or net metering) service agreements.
- Transfers can only occur between Residential and Small General Service accounts (Schedules 1, 6, 7 and 8) or between Large Commercial, Industrial and Irrigation accounts (Schedules 9, 19, 24 and 84).
- If multiple service agreements are eligible for aggregation, excess credits must first be applied to eligible service agreements on the same rate schedule as the on-site generation/net metering service agreement. Remaining excess credits may then be applied to offset consumption at eligible service agreements on differing rate schedules in accordance with the criteria detailed above. For example, if the transfer is occurring from a Schedule 6 (Residential) service agreement to two eligible service agreements, one Schedule 1 (Residential) and the other Schedule 7 (Small General Service), you must transfer some portion of your credit to the Schedule 1 service agreement to be eligible to transfer a portion to the Schedule 7 service agreement.