Solar Panel Payback Calculator for Idaho
Idaho (ID) offers good solar potential with an average of 4.7 peak sun hours per day. The average residential electricity rate is 10.5 cents per kWh, and solar installation costs average $2.85 per watt. Based on these figures, a typical 6 kW residential solar system in Idaho has an estimated payback period of 13.8 years and generates $17,504 in total savings over 25 years.
Solar System Size Comparison for Idaho
The table below compares four common residential solar system sizes for Idaho homeowners. All calculations use the state average electricity rate of 10.5 cents per kWh, average installation cost of $2.85/W, and 4.7 peak sun hours. The federal 30% Investment Tax Credit is included in all scenarios.
| System Size | Gross Cost | Federal Credit | Net Cost | Annual Output | Annual Savings | Payback | 20-Year Savings | 25-Year Savings |
|---|---|---|---|---|---|---|---|---|
| 4 kW | $11,400 | $3,420 | $7,980 | 5,490 kWh | $576 | 13.8 years | $6,723 | $11,672 |
| 6 kW | $17,100 | $5,130 | $11,970 | 8,234 kWh | $865 | 13.8 years | $10,082 | $17,504 |
| 8 kW | $22,800 | $6,840 | $15,960 | 10,979 kWh | $1,153 | 13.8 years | $13,443 | $23,341 |
| 10 kW | $28,500 | $8,550 | $19,950 | 13,724 kWh | $1,441 | 13.8 years | $16,805 | $29,177 |
Solar Energy in Idaho: What You Need to Know
Idaho has good solar resources, especially in the southern part of the state. Very low electricity rates (primarily from hydroelectric) result in longer payback periods. The market is growing as installation costs decrease.
Electricity Rates in Idaho
The average residential electricity rate in Idaho is 10.5 cents per kWh, which is below the national average of approximately 16 cents per kWh. Lower electricity rates mean the payback period is longer, but the 25-year savings are still substantial. As electricity rates continue to rise (averaging 3% per year nationally), the value of solar ownership increases over time.
Peak Sun Hours and Solar Production
Idaho averages 4.7 peak sun hours per day, which is a solid level for residential solar. While not the sunniest state, the combination of decent sun hours with modern high-efficiency panels produces meaningful electricity savings throughout the year. A 6 kW system in Idaho produces approximately 8,234 kWh per year, accounting for standard system efficiency losses and typical weather patterns.
Idaho Solar Incentives and Programs
Idaho's state solar tax deduction (40% first year, 20% over next 3 years) was discontinued. Net metering available. No sales tax exemption. Low rates from Idaho Power make economics challenging without state incentives.
Incentive Summary for Idaho
- Federal Tax Credit: 30% ITC (available through 2032)
- State Tax Credit: None
- Net Metering: Available
- SRECs: Not available
- Avg. Installation Cost: $2.85/watt (before incentives)
How Idaho Compares to Similar States
Below is a comparison of Idaho with five states that have similar solar conditions. All calculations are based on a 6 kW residential system using each state's average electricity rate and sun hours.
| State | Sun Hours | Rate (c/kWh) | Cost/Watt | Net Cost | Payback | 25-Yr Savings |
|---|---|---|---|---|---|---|
| Idaho | 4.7 | 10.5c | $2.85 | $11,970 | 13.8 years | $17,504 |
| Alabama | 4.7 | 13c | $2.80 | $11,760 | 11.0 years | $24,732 |
| Georgia | 4.7 | 13c | $2.85 | $11,970 | 11.2 years | $24,522 |
| Mississippi | 4.7 | 12c | $2.85 | $11,970 | 12.1 years | $21,715 |
| North Carolina | 4.7 | 12.5c | $2.80 | $11,760 | 11.4 years | $23,329 |
| Kansas | 4.8 | 13.5c | $2.90 | $12,180 | 10.7 years | $26,526 |
Environmental Impact of Solar in Idaho
Installing a 6 kW solar system in Idaho offsets approximately 7,040 pounds of CO2 per year, which is equivalent to planting 58.1 trees annually. Over the 25-year lifespan of your solar system, that adds up to roughly 176,000 pounds of avoided carbon emissions. Choosing solar energy is one of the most impactful steps a homeowner can take to reduce their carbon footprint and contribute to cleaner air in Idaho communities.
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