Solar Panel Payback Calculator for Tennessee
Tennessee (TN) offers good solar potential with an average of 4.4 peak sun hours per day. The average residential electricity rate is 12 cents per kWh, and solar installation costs average $2.80 per watt. Based on these figures, a typical 6 kW residential solar system in Tennessee has an estimated payback period of 12.7 years and generates $19,777 in total savings over 25 years.
Solar System Size Comparison for Tennessee
The table below compares four common residential solar system sizes for Tennessee homeowners. All calculations use the state average electricity rate of 12 cents per kWh, average installation cost of $2.80/W, and 4.4 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 | $11,200 | $3,360 | $7,840 | 5,139 kWh | $617 | 12.7 years | $7,889 | $13,184 |
| 6 kW | $16,800 | $5,040 | $11,760 | 7,709 kWh | $925 | 12.7 years | $11,835 | $19,777 |
| 8 kW | $22,400 | $6,720 | $15,680 | 10,278 kWh | $1,233 | 12.7 years | $15,778 | $26,367 |
| 10 kW | $28,000 | $8,400 | $19,600 | 12,848 kWh | $1,542 | 12.7 years | $19,724 | $32,961 |
Solar Energy in Tennessee: What You Need to Know
Tennessee is primarily served by TVA, which does not offer traditional net metering. TVA's Green Invest program and local power company programs are available. Low rates from TVA hydro make payback longer.
Electricity Rates in Tennessee
The average residential electricity rate in Tennessee is 12 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
Tennessee averages 4.4 peak sun hours per day, which is moderate but still viable for residential solar. Many successful solar installations operate across the Northeast and Midwest with similar sun hours. Modern panels are increasingly efficient even in diffuse light conditions. A 6 kW system in Tennessee produces approximately 7,709 kWh per year, accounting for standard system efficiency losses and typical weather patterns.
Tennessee Solar Incentives and Programs
No state income tax, so no state tax credit. No mandatory net metering. TVA offers Green Invest and other distributed generation programs. Local power companies may offer solar buyback. No sales tax exemption.
Incentive Summary for Tennessee
- Federal Tax Credit: 30% ITC (available through 2032)
- State Tax Credit: None
- Net Metering: Not mandated / Limited
- SRECs: Not available
- Avg. Installation Cost: $2.80/watt (before incentives)
How Tennessee Compares to Similar States
Below is a comparison of Tennessee 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 |
|---|---|---|---|---|---|---|
| Tennessee | 4.4 | 12c | $2.80 | $11,760 | 12.7 years | $19,777 |
| Missouri | 4.5 | 13c | $2.90 | $12,180 | 11.9 years | $22,761 |
| Montana | 4.5 | 12c | $3.00 | $12,600 | 13.3 years | $19,653 |
| Nebraska | 4.5 | 12c | $3.00 | $12,600 | 13.3 years | $19,653 |
| South Dakota | 4.5 | 12.5c | $3.00 | $12,600 | 12.8 years | $20,997 |
| Virginia | 4.3 | 13c | $2.95 | $12,390 | 12.7 years | $21,000 |
Environmental Impact of Solar in Tennessee
Installing a 6 kW solar system in Tennessee offsets approximately 6,591 pounds of CO2 per year, which is equivalent to planting 54.4 trees annually. Over the 25-year lifespan of your solar system, that adds up to roughly 164,775 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 Tennessee communities.
Ready to Calculate Your Exact Savings?
Use our Solar Payback Calculator to enter your specific system size, electricity rate, and roof shading conditions for a personalized estimate. Or browse all 50 states + DC to compare solar economics across the country.