Solar panels in Twin Falls: what they cost and what they make
A typical Twin Falls home needs 18 solar panels. They would make about 11,559 kWh a year and cost $19k to $29k before incentives. At today's electricity prices they pay for themselves in about 23.9 yrs.
See panels on your own Twin Falls roof
Type your address. You get your roof from above, the panels that fit, a month-by-month forecast and a battery test. No phone number.
What solar costs in Twin Falls
At $3.00 a watt, the median price cash buyers pay nationally, a 7.6 kW system costs about $22,800. Quotes in Twin Falls will usually fall between $19,000 and $28,500. Complex roofs, main-panel upgrades and financing push prices up.
The 30% federal tax credit no longer applies to systems homeowners buy. This estimate includes no state or utility incentives; check with your utility before you buy.
The number that decides whether solar pays in Twin Falls is what your utility pays for the power you send back. Idaho Power moved to net billing: exports earn ~3–16¢ depending on season and time. Under full payback is about 14.8 yrs. Under net billing it is about 23.9 yrs, because only the ~43% of solar a typical home uses as it is made saves the full retail price.
Cash purchase, prices rising 2.5% a year, panels losing 0.5% a year, $25/kW a year for upkeep. No federal credit for homeowner-owned systems.
Every way to pay for a 7.6 kW system in Twin Falls
Change any number →| Way to pay | Day one | Monthly payment | Monthly net, year 1 | Ahead after 25 years |
|---|---|---|---|---|
| Pay cash Full price on install day | $22,800 | $0 | +$59 | $1,200 |
| Credit-union loan 8% APR, 20 years, no dealer fee | $0 | $191 | −$132 | −$22k |
| “1.99%” solar loan 1.99% APR, 25 years, 25% dealer fee | $0 | $121 | −$61 | −$12k |
| Lease $65/mo, +2.9%/yr | $0 | $65 | +$10 | $700 |
| Power purchase (PPA) 6.6¢/kWh, +2.9%/yr | $0 | $64 | +$11 | $3,100 |
Under net billing, the usual rule for new customers here, at 13.0¢/kWh rising 2.5% a year. The “1.99%” loan’s $5,700 dealer fee is included in its payments. Lease and PPA prices are typical offers, not quotes.
How much sunshine Twin Falls gets
kWh per kW, 25° southJul is the best month for solar in Twin Falls, and Dec the weakest: a Dec day makes 38% of a Jul day. A 6 kW system would make about 386 kWh in Dec and 1,020 kWh in Jul.
On June 21 the sun rises at 6:00 am and sets at 9:18 pm, 15 hours 19 minutes of daylight. On December 21 it is up from 8:04 am to 5:07 pm, just 9 hours 3 minutes.
Peak sun hours in Twin Falls, month by month
| Month | Flat ground | Panels at 37° | kWh per kW |
|---|---|---|---|
| Jan | 2.0 | 3.5 | 81 |
| Feb | 2.8 | 4.2 | 90 |
| Mar | 4.0 | 5.2 | 125 |
| Apr | 5.5 | 6.0 | 146 |
| May | 6.7 | 6.4 | 163 |
| Jun | 7.6 | 6.9 | 167 |
| Jul | 7.6 | 7.0 | 170 |
| Aug | 6.6 | 6.9 | 162 |
| Sep | 5.3 | 6.6 | 147 |
| Oct | 3.6 | 5.6 | 126 |
| Nov | 2.2 | 4.0 | 88 |
| Dec | 1.5 | 2.8 | 64 |
| Year | 4.6 | 5.4 | 1,529 |
A peak sun hour is one hour of sunlight at 1,000 W per m². Why sites disagree.
The best angle and direction for panels in Twin Falls
| Roof faces (6/12 pitch) | Output vs south | kWh per kW |
|---|---|---|
| South | 100% | 1,529 |
| Southeast | 95% | 1,453 |
| Southwest | 95% | 1,453 |
| East | 82% | 1,254 |
| West | 81% | 1,238 |
| North | 59% | 902 |
Face panels south and tilt them 37° for the most energy over a year. East and west roofs keep about 82% of that. A north-facing roof keeps 59%, which is rarely worth the money. Try other angles.
Where the sun goes over Twin Falls
The noon sun is lower in winter, which is why the best winter tilt (66°) is steeper than the best summer tilt (13°).
Twin Falls's homes
Twin Falls has 20,828 households. 64.1% own their home, and 12,589 of those owners live in single-family houses, the kind of home that usually gets rooftop solar.
The median home here was built in 1982. Many roofs that age are due for replacement. Replace the roof first, then add solar: taking panels off and putting them back later costs thousands.
29.7% of homes heat with electricity and 66.3% with gas. If you switch to a heat pump or an electric car, plan for more panels or leave room on the roof.
Source: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates.
If the power goes out in Twin Falls
Solar panels alone shut off in a blackout. Add a battery and they keep going. One Tesla Powerwall 3 (13.5 kWh) running a fridge, freezer, furnace fan, lights, Wi-Fi, TV and microwave (6.9 kWh a day):
Change the appliances, the battery and the weather in the battery calculator.
Questions people ask about solar in Twin Falls
How much do solar panels cost in Twin Falls?
A 7.6 kW system — enough for the average Idaho home — costs about $19,000 to $28,500 before incentives, based on $2.50–$3.75 per watt. The 30% federal credit no longer applies to systems homeowners buy.
How many solar panels does a house in Twin Falls need?
About 18 panels of 420 watts for a home using 944 kWh a month, the Idaho average. Each kilowatt of panels here makes about 1,529 kWh a year on a south-facing roof.
Is solar worth it in Twin Falls?
Over 25 years, solar power here costs about 10.1¢ per kWh, against 13.0¢ from the grid today. Payback is about 14.8 yrs if your utility credits exported power at the full retail rate, and 23.9 yrs if it pays about 30% of retail. Most new customers in Idaho are on the lower rate.
How many peak sun hours does Twin Falls get?
5.4 a day on panels tilted to 37°, and 4.6 on flat ground. The best month is Jul; the weakest is Dec.
What is the best angle for solar panels in Twin Falls?
37° for the most energy over a year, facing south. 66° is best in winter and 13° in summer. On a normal pitched roof, anything within 15° of 37° gives you about 95% of the maximum.
How long would a home battery last in a Twin Falls power outage?
A Tesla Powerwall 3 running a fridge, freezer, furnace fan, lights, Wi-Fi, TV and microwave (6.9 kWh a day) lasts about 43 hours with no sun. With 7 kW of solar to recharge it, it gets through a three-day outage even in overcast January.
Solar near Twin Falls
| City | Miles | kWh per kW | Sun hours |
|---|---|---|---|
| Pocatello, ID | 104 | 1,524 | 5.3 |
| Boise, ID | 114 | 1,519 | 5.4 |
| Meridian, ID | 122 | 1,515 | 5.3 |
| Nampa, ID | 127 | 1,515 | 5.3 |
| Caldwell, ID | 134 | 1,510 | 5.3 |
Cities with the same sunshine as Twin Falls
These far-away cities get almost exactly as much solar energy per panel.
- Enid, OK 1,553 kWh per kW
- Sarasota, FL 1,551 kWh per kW
- North Port, FL 1,545 kWh per kW
Snow: NASA records about 19 cm of snow on the ground here in an average January. Covered panels make little until it slides off, and these figures (like PVWatts') don't subtract that.
Sources: NASA POWER 2001–2020 monthly climatology (grid cell 8 km from Twin Falls's Census point), our PV model (within 1.6% of NLR PVWatts® on average), U.S. EIA prices and use, U.S. Census 2025 population estimates and ACS 2020–2024. Estimates for an average home, not a site survey. How we calculate.