Curious to know what an investment in solar looks like?
Google’s Project Sunroof – an online solar estimator – can give you an estimate of the cost to install a system and years until payback. Estimates provided by Google’s Project Sunroof are based on current electric prices and compensation structures. Future changes in prices, credit amounts or billing structure will impact the estimated net savings and payback. Project Sunroof is not functional for all of Idaho Power’s service area, so we’ve provided three Project Sunroof examples of a typical home below.
Note: On Dec. 20, 2019, the Idaho Public Utilities Commission (IPUC) issued Order 34509 in case IPC-E-18-15, which reminds customers that Idaho Power’s on-site generation tariffs (Schedules 6, 8, and 84), as with all tariffs, are not contracts and are subject to change at any time upon order of the IPUC. Changes to the on-site generation tariffs in the future may include, but are not limited to, modifications to rates, billing components, billing structure, compensation structure, and the value for excess energy produced by the customer’s on-site generation system (and thus, the amount a customer would be compensated). Learn more about this case and order on the IPUC website.
The IPUC’s order is consistent with the Idaho Residential Energy System Disclosure Act, which requires solar retailers to provide a disclosure reminding potential customers that 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.
 The Jones’ House |
 The Zhang’s House |
 The Jackson’s House |
|
|---|---|---|---|
| Average monthly electric use: | 500 kWh | 1,000 kWh | 1,950 kWh |
| Average monthly bill: | $45 | $90 | $175 |
| Solar system size needed: | 3.75 kW DC | 8 kW DC | 15.75 kW DC |
| Estimated upfront cost: | $13,300 ($3.55 per watt) | $26,700 ($3.33 per watt) | $51,000 ($3.23 per watt) |
| Net cost after tax credit: | $8,400 | $16,700 | $31,900 |
| Purchasing with a loan | |||
| Estimated break even point: | Beyond 20 years | Beyond 20 years | Beyond 20 years |
| Total savings after 20 years (Simple Savings): | -$6,300 (loss) | -$9,900 (loss) | -$15,000 (loss) |
| Total savings after 20 years (Net Present Value): | -$4,200 (loss) | -$6,500 (loss) | -$9,700 (loss) |
1Why does Project Sunroof provide two different 20-year values?
Simple savings, or the payback method, and net present value are different ways of looking at the long-term value of a purchase. Payback tells you how long it takes to recoup your money. Net present value determines if it is a good financial investment compared to other things you could do with your money—like earning interest in your bank account or investing in stocks and bonds.