SUMMIT Energy Solutions

Mokena city reference

Solar in Mokena, checked against utility math.

A city-level guide for Will County homeowners comparing quotes, system size, incentive timing, and Commonwealth Edison billing assumptions.

Reference ZIP
60448
Utility
ComEd
Focus
Illinois Shines + utility billing

Local numbers

The Mokena baseline

A 7 kW south-facing system in Mokena produces about 9,300 kWh/year per NREL PVWatts. Pre-incentive install cost runs $19,600 to $23,800, with cash payback around 7 to 8 years before financing markup.

9,300 kWh/year

Annual production

PVWatts v8, 7 kW south-facing.

~$9,100

Net cash cost

After incentives, before financing.

7 to 8 years

Cash payback

No dealer-fee markup.

12 to 15 years

Financed payback

With typical dealer fees.

Utility context

The bill rules are local.

Most of Mokena is served by Commonwealth Edison. Net metering, rate trajectory, and program timing differ by utility; the Illinois state hub covers the cross-utility picture.

ComEd Will County Verified 2026-05-29