150-Amp Electrical Service in Chicago

We're most often asked about 150-amp service by homeowners who fall between two stools: their 100-amp panel is full or marginal, but a 200-amp upgrade would require more work on their property than they're prepared to take on right now. Typical scenarios include:

• Regular breaker trips when modern HVAC, electric laundry, and a microwave run simultaneously
• Adding a ductless heat pump or upgrading a smaller central AC system
• Finishing a basement or [basement electrical wiring](/services/chicago/basement-electrical-wiring-chicago) for a guest suite
• Kitchen or bathroom expansion — see [kitchen electrical remodel](/services/chicago/kitchen-electrical-remodel-chicago) and [bathroom electrical](/services/chicago/bathroom-electrical-chicago)
• Inadequate circuits — panel is full, tandems are already stacked
• Uneven power distribution causing voltage sag when large motor loads start

Many Chicago homes built in the 1990s-2000s originally came with 100-amp service, and many vintage homes in Rogers Park, Edgewater, and Avondale were upgraded to 100-amps decades ago during a previous wave of renovations. A 150-amp upgrade is a practical intermediate step that adds meaningful capacity without the full equipment and permit cost of 200 amps.

A full 150-amp service upgrade in a Chicago home typically includes:

• ComEd coordination for the service disconnect and reconnect
• New meter socket rated for 150-amp service per ComEd Book of Standards
• New service entrance cable or conduit from weatherhead to meter
• New 150-amp main breaker panel sized for future circuits
• Grounding electrode system — ground rods, water pipe bond, gas line bond where required
• All connections tightened to manufacturer torque spec
• Permit pulled through the Chicago Department of Buildings
• Final electrical inspection and ComEd release

A single-story home upgrade usually takes a full day on-site. For a two-flat or a vintage home with a long run from the weatherhead to the panel, a second day may be needed. We schedule the ComEd disconnect for early in the work window so power is restored the same day.

In an era when nearly every new electrical upgrade leans toward 200-amp service, 150 amps still has a place. It makes sense when:

• Your load calculation clears 150 with headroom but doesn't approach 200
• Your meter socket, service entrance, or masthead configuration can accept a 150 but would need relocation work for 200
• You're on a tight budget and genuinely don't plan to add an EV charger, induction cooking, or heat pump
• You're adding service to an accessory structure (garage, coach house, detached studio) where 150 is more than enough

For most single-family homeowners with any intention to add modern electric loads in the next decade, we recommend going directly to 200 amps. See our [200-amp electrical service page](/services/chicago/200-amp-electrical-service-chicago) and [electrical panel upgrade](/services/chicago/electrical-panel-upgrade-chicago) for a full comparison, plus the [panel upgrade cost guide](/services/chicago/cost-guides/cost-panel-upgrade-chicago).