A 3,500 square foot home in Utah typically uses about 1,691 kWh per month at the state average rate of 11.2¢/kWh (EIA). With 5.8 peak sun hours per day, most homeowners need a 11.7 kW solar system — roughly 30 panels at 400W. After the 30% federal ITC, net cost is about $24,600, with 12.4-year payback and $58,300+ in estimated 25-year savings.
Content roles: This page is your Utah-specific sizing decision for 3,500 sq ft. For national methodology and roof/orientation depth, see the 3,500 sq ft national guide. For bill-based sizing, see $300/month (~$189/mo equivalent in Utah). Policy depth: Utah solar data.
⚡ System Size
How Many Solar Panels for a 3,500 sq ft House in Utah?
Utah electricity rates and sun hours change panel count versus the US average:
System size (kW) = Annual kWh ÷ (Peak sun hours × 365 × 0.82)
For 3,500 sq ft in Utah:
Estimated monthly usage: ~1,691 kWh
Peak sun hours: 5.8 h/day
System size:11.7 kW (~30 × 400W panels)
Metric
Utah
US average
Rate
11.2¢/kWh
16.3¢/kWh
Sun hours
5.8 h/day
4.5 h/day
System size
11.7 kW
15.1 kW
Panels (400W)
30
38
Utah requires a smaller system than the national average for the same square footage. Use our solar system size calculator with your actual utility bills for a precise ZIP-level result.
Find your exact solar savings
Enter your ZIP code for a personalized estimate using your state's electricity rate and sun hours.
💰 System Cost
What Does Solar Cost for a 3,500 sq ft Home in Utah After the ITC?
At $3.00/W installed (SEIA 2026), a 11.7 kW system in Utah costs about $35,100 before incentives. The 30% ITC saves ~$10,530, for $24,600 net cost.
📈 Payback Period
How Long Is Solar Payback on a 3,500 sq ft Home in Utah?
A 11.7 kW system saving ~$1,978/year pays back in about 12.4 years after the ITC. At 3% rate escalation, 25-year utility spend totals ~$82,900 vs $24,600 net solar — $58,300+ lifetime advantage.
Solar vs utility company · 25-year comparison
Total cost of staying on the grid vs owning solar for a $300/month bill (national average assumptions).
Utah’s Residential Energy Tax Credit provides 25% of the purchase price and installation costs of a solar system (capped at $1,600 for systems under 2 kW, $2,400 for larger systems). Utah also has a Solar Property Tax Exemption and net metering policies governed by the Utah Public Service Commission.
At Utah's average rate of 11.2¢/kWh and 5.8 peak sun hours, a 3,500 sq ft home (~1,691 kWh/month) typically needs a 11.7 kW system — about 30 panels at 400W. See the [national 3,500 sq ft guide](/guides/how-many-solar-panels-3500-sq-ft-house/) for methodology.
A 11.7 kW system in Utah costs roughly $35,100 installed before incentives. The 30% federal ITC reduces net cost to about $24,600. Utah's Residential Energy Tax Credit provides 25% of the purchase price and installation costs of a solar system (capped at $1,600 for systems under 2 kW, $2,400 for larger systems). Utah also has a Solar Property Tax...
At $24,600 net cost and ~$1,978/year in bill savings, simple payback in Utah is about 12.4 years.
Most Utah homeowners in this size range see **$58,300+** estimated 25-year savings vs utility power. Equivalent monthly bill: **~$189** — compare the [$300/month bill guide](/guides/solar-panels-300-month-electric-bill/) for bill-based sizing.
The US average needs a 15.1 kW system at 11.0-year payback. Utah needs 11.7 kW with 12.4-year payback at 11.2¢/kWh and 5.8 sun hours.
$300/month electric bill by state
System size and payback vary by electricity rate and sun hours — see your state.