Solar in Knoxville: What Homeowners Should Know
Knoxville sees an average of 4.6 peak sun hours per day, which is what ultimately determines how much electricity a rooftop system produces here. A standard 8 kW system (about 20 panels) generates roughly 10,746 kWh each year in Knoxville — and paired with Tennessee's local electricity rate of $0.116/kWh, that's where the savings come from.
At those numbers, a Knoxville homeowner saves about $104/month ($1,246/year). Against a $22,800 system cost, that works out to a payback of about 18.3 years, after which the system produces essentially free power for two decades — an estimated $19,777 in lifetime savings. Note: the 30% federal tax credit expired at the end of 2025 for purchased systems, though a solar lease or PPA can still pass it through. The local grid is served by Knoxville Utilities, whose net metering policy directly affects how much credit you earn for surplus power.
Cost & Savings Breakdown
Based on a standard 8 kW system in Knoxville
25-Year Savings Projection
Utility & Net Metering
Available Incentives
Choosing a Solar Installer in Knoxville
- 1.Get at least 3 quotes. Prices in Tennessee vary widely between installers — comparing bids on the same 8 kW system is the fastest way to avoid overpaying.
- 2.Confirm Knoxville Utilities interconnection experience. An installer who regularly files with your local utility will move your permit and net-metering paperwork through faster.
- 3.Check licensing & the warranty. Look for NABCEP-certified installers and a workmanship warranty of 10+ years on top of the standard 25-year panel warranty.
- 4.Size for your actual usage. With 4.6 sun hours/day in Knoxville, make sure the proposed system matches your kWh history — not just your roof space.
Common Questions
How much does solar cost in Knoxville?
Solar in Knoxville, Tennessee costs approximately $22,800 for a 8 kW system. The 30% federal tax credit expired December 31, 2025 for purchased systems, though solar leases and PPAs can still pass it through.
What is the solar payback period in Knoxville?
The estimated payback period for solar in Knoxville is 18.3 years for a standard 8 kW system, based on local sun hours of 4.6 hrs/day and a rate of $0.116/kWh.
Is solar worth it in Knoxville?
For most Knoxville homeowners, yes. With 4.6 peak sun hours per day and an electricity rate of $0.116/kWh, a typical system saves $1,246 per year and around $19,777 over 25 years after paying for itself in 18.3 years.
How many solar panels do I need in Knoxville?
A standard 8 kW home solar system is about 20 panels, producing roughly 10,746 kWh per year in Knoxville at 4.6 sun hours/day. Your exact size depends on your household's electricity use.
Does Knoxville Utilities offer net metering?
Knoxville Utilities offers Avoided Cost net metering. Avoided cost rate.