Solar panels in Johnson City, TN
Roofs in Johnson City get about 1,546 hours of usable sunlight a year — more than 50% of the cities we've measured. Here's what that means in cost, savings and payback, using real rooftop data rather than a national average.
Check your specific roof in Johnson City → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.
What a typical Johnson City solar system costs
A 21-panel system (8.4 kW) is about right for an average Johnson City home using 10,800 kWh a year. It would produce roughly 11,038 kWh annually and offset 100% of that usage.
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 4,205 | $6,384 | $509 | 12.5 yrs |
| 12 panels | 4.8 kW | 6,308 | $9,576 | $763 | 12.5 yrs |
| 16 panels | 6.4 kW | 8,410 | $12,768 | $1,018 | 12.5 yrs |
| 20 panels | 8 kW | 10,513 | $15,960 | $1,272 | 12.5 yrs |
| 26 panels | 10.4 kW | 13,667 | $20,748 | $1,394 | 14.9 yrs |
Notice that payback barely improves as systems get bigger, and eventually gets worse. That's because you can only save money on electricity you were going to buy anyway. Once a system covers your usage, extra panels mostly generate exports at a much lower rate.
Why Johnson City gets 1,546 sun hours
That figure comes from Google's analysis of real rooftops across Johnson City — it already accounts for shading from trees, chimneys and neighbouring buildings, which is why it's lower than the raw "hours of daylight" figures you'll see elsewhere. An unusually open, unshaded roof in Johnson City reaches about 1,619 hours, roughly 5% better than typical.
The numbers behind this page
| Typical usable sunlight | 1,546 hrs/yr |
|---|---|
| Unshaded roof | 1,619 hrs/yr |
| Electricity rate (Tennessee avg) | 12.1¢/kWh |
| Installed cost assumed | $2.85/W |
| Panel size assumed | 400 W |
| Federal tax credit | 30% |
| Typical household usage | 10,800 kWh/yr |
| Power used as generated | 34% |
| Paid for exported power | full retail (net metering) |
| Rooftops sampled here | 14 |
| Google imagery from | 2015 |
Nearby cities
See all of Tennessee → statewide sunlight, rates, incentives and every city we've measured.
Johnson City solar questions
How many solar panels do I need in Johnson City?
About 21 panels for an average home. Johnson City roofs get 1,546 usable sun hours a year, so each 400W panel produces roughly 526 kWh annually.
Is solar worth it in Johnson City?
At 12.1¢/kWh and 1,546 sun hours, a typical system pays for itself in about 12.8 years and returns roughly $16,092 over 25 years. That is slower than the national average, so compare quotes carefully.
How much do solar panels cost in Johnson City?
A 8.4 kW system costs about $23,940 before incentives and $16,758 after the 30% federal tax credit. Prices vary by installer, roof complexity and equipment.
Worth reading before you buy
Estimates only, generated 2026-08-22 from Google Solar API rooftop samples and average Tennessee electricity rates. Not a quote and not financial advice. Your roof, usage, utility plan and local incentives will change these numbers — get real quotes before buying.