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Solar panels in Manassas, Virginia: 1,348 kWh per kW per year

A south-facing kilowatt of panels in Manassas makes about 1,348 kWh a year, 1.3% below the Virginia median. Power here comes from Manassas or Dominion; the numbers below use the Manassas rate of 12.31¢ per kWh (2025 average). Your bill shows which one serves you.

1,348

kWh / kW / year

PVWatts, south-facing

4.91

Peak sun hours / day

annual average irradiance

10,784

kWh / yr from 8 kW

a common home system

12.31¢

Manassas price

2025 residential avg

Monthly solar production per kW in Manassas, VirginiaKilowatt-hours per month for a 1 kW south-facing system. Peak in Jun, low in Dec.050100150Jan87Feb98Mar121Apr129May127Jun134Jul133Aug129Sep114Oct107Nov85Dec85
NREL PVWatts v8, 1 kW DC, fixed roof mount, azimuth 180°, tilt 25°, 14% losses. Jun makes about 1.6× Dec.

Seasonality

Monthly solar production in Manassas

Virginia net metering carries excess credits forward for 12 months, so Jun'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: 15.4%. Elevation about 69 m. Compare every town on the city list, or see how roof direction, tilt and shade change the number.

Payback in Manassas

Solar cost and payback for an average home in Manassas

Assumes 1,108 kWh a month (≈ $136) at City of Manassas Utilities's 2025 average price, Manassas'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

9.9 kW

System size

$27,522

Est. cost

$1,847

Year-1 savings

13.8 yrs

Break-even

$53,621

25-yr savings

$26,099

Net benefit

undiscounted

Utility

Electric utilities serving Manassas

Manassas is split between utilities. Rates are calendar-year averages; see all Virginia utilities for the full table.

UtilityTypeAvg price ¢/kWhAvg kWh / monthData year
City of Manassas UtilitiesMunicipal utility12.311,1082025*
Dominion EnergyInvestor-owned utility15.201,0382025*

Questions

Questions about solar in Manassas

How much electricity does a solar system produce in Manassas?
About 1,348 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 10,784 kWh a year. East- or west-facing roofs make less; the calculator applies those factors.
Who is the electric utility in Manassas?
EIA's service-territory data lists City of Manassas Utilities and Dominion Energy for Manassas. Boundaries run through the locality; your bill shows which one serves you. Manassas's 2025 average residential price was 12.31¢ per kWh.
Is solar worth it in Manassas?
For an average Manassas home (1,108 kWh a month), the default assumptions give a 9.9 kW system costing about $27,522 with a break-even around 13.8 years and $26,099 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 1130607.csv typical-year weather dataset for grid cell 1130607, about 2 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 Manassas

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.