Solar Atlas · Pennsylvania
Is solar worth it in Philadelphia, PA?
A 7 kWdc rooftop array in Philadelphia makes about 9,516 kWh a year (NLR PVWatts, modeled) and pays back in 13.2 years at PECO Energy Co’s 19.3¢/kWh residential rate (Aug 2025–Jul 2026), with no federal credit. Exports follow Pennsylvania net metering.
39.95°N · 9.2–14.8 h daylight · site signature
- Production
- 1,359 kWh per kWdc per year · capacity factor 15.5% AC
- Residential rate
- 19.3¢/kWh · PECO Energy Co
- Exported solar
- Pennsylvania net metering · credited at retail
- Climate
- humid subtropical (Köppen Cfa, bordering Dfa) · 13.5 °C mean, 1,120 mm/yr
Source: NLR PVWatts v8.5.0 (NSRDB PSM V3 GOES tmy-2020 3.2.0) — 1 kW, tilt 20°, azimuth 180°, roof mount, 14% losses · fetched 2026-09-24 · modeled, not metered
Source: EIA-861M utility average · Aug 2025–Jul 2026 · EIA Pennsylvania average Jan–Jul 2026 21.0¢ · utility’s EIA-861 2024 average 16.2¢
PECO Energy Co customers who buy supply from a competitive supplier or community choice aggregator pay delivery plus their supplier’s price; the average shown is the utility’s default (bundled) service.
Source: Customers of Pennsylvania electric distribution companies (investor-owned) · checked 2026-09-24
Source: NOAA NCEI Climate Normals 1991–2020, PHILADELPHIA INTL AP, PA US (10.5 km away) · fetched 2026-09-24
No federal credit: the homeowner credit (§25D) ended for systems installed after 2025-12-31. A lease or PPA price may reflect the lessor’s §48E credit. 26 U.S.C. §25D(h) and (e)(8)(A) · policy as of 2026-09-24
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Your exact roof, or a business
The payback calculator runs hourly PVWatts at your address. The Modeler opens a grid-tied home at Philadelphia. A business goes to the Quote Studio with the 15.9¢/kWh commercial rate.