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Isle of Wight County DominionPGEC

Solar panels in Windsor, Virginia: 1,380 kWh per kW per year

A south-facing kilowatt of panels in Windsor makes about 1,380 kWh a year, 1% above the Virginia median. Power here comes from Dominion or PGEC; the numbers below use the Dominion rate of 15.20¢ per kWh (2025 average). Your bill shows which one serves you.

1,380

kWh / kW / year

PVWatts, south-facing

5.02

Peak sun hours / day

annual average irradiance

11,040

kWh / yr from 8 kW

a common home system

15.20¢

Dominion price

2025 residential avg

Monthly solar production per kW in Windsor, VirginiaKilowatt-hours per month for a 1 kW south-facing system. Peak in May, low in Dec.050100150Jan96Feb95Mar112Apr125May138Jun131Jul138Aug132Sep118Oct112Nov98Dec85
NREL PVWatts v8, 1 kW DC, fixed roof mount, azimuth 180°, tilt 25°, 14% losses. May makes about 1.6× Dec.

Seasonality

Monthly solar production in Windsor

Virginia net metering carries excess credits forward for 12 months, so May's surplus offsets Dec's shortfall. Systems are sized to annual usage rather than to the lowest month. How the calculator models net metering; the current rules by utility are on this Virginia incentives page, maintained by the installer behind this site.

Capacity factor: 15.8%. Elevation about 24 m. Compare every town on the city list, or see how roof direction, tilt and shade change the number.

Payback in Windsor

Solar cost and payback for an average home in Windsor

Assumes 1,038 kWh a month (≈ $158) at Dominion Energy's 2025 average price, Windsor's PVWatts production, 3% annual rate growth and $2.78/W installed, no federal credit. Dollars are nominal. Change any of it in the calculator, or compare every utility in Are solar panels worth it in Virginia?

Run it with your bill

9.0 kW

System size

$25,020

Est. cost

$2,068

Year-1 savings

11.1 yrs

Break-even

$61,751

25-yr savings

$36,731

Net benefit

undiscounted

Utility

Electric utilities serving Isle of Wight County

Isle of Wight County is split between utilities. Rates are calendar-year averages; see all Virginia utilities for the full table.

UtilityTypeAvg price ¢/kWhAvg kWh / monthData year
Dominion EnergyInvestor-owned utility15.201,0382025*
Prince George Electric CooperativeElectric cooperative13.521,3942025*

Questions

Questions about solar in Windsor

How much electricity does a solar system produce in Windsor?
About 1,380 kWh per year for every kilowatt of panels on a south-facing roof, according to NREL's PVWatts. An 8 kW system would make roughly 11,040 kWh a year. East- or west-facing roofs make less; the calculator applies those factors.
Who is the electric utility in Windsor?
EIA's service-territory data lists Dominion Energy and Prince George Electric Cooperative for Isle of Wight County. Boundaries run through the locality; your bill shows which one serves you. Dominion's 2025 average residential price was 15.20¢ per kWh.
Is solar worth it in Windsor?
For an average Dominion home (1,038 kWh a month), the default assumptions give a 9.0 kW system costing about $25,020 with a break-even around 11.1 years and $36,731 net benefit (nominal) over 25 years. Your bill, roof and shade change that; the calculator lets you enter them. The statewide picture is in “Is solar worth it in Virginia?”.
Where does the sun data come from?
NREL PVWatts v8 (8.5.0), using the 1154737.csv typical-year weather dataset for grid cell 1154737, about 0 km from the town center. Inputs: 1 kW DC, fixed roof mount, 180° azimuth, 25° tilt, 14% system losses. Typical-year data doesn't change year to year.

Solar production in towns near Windsor

Sources: NREL PVWatts v8 (8.5.0, typical-year weather); EIA Form 861 2025 utility data and service territories; U.S. Census Bureau place coordinates. Formulas and assumptions on the methodology page.