DuPage County, IL — Generator Installation Guide
Standby Generator Installation in Downers Grove, IL
From the 2020 derecho to the 2021 tornado that struck neighboring Woodridge and Darien, DuPage County outages are a recurring reality. Real install-cost drivers, honest sizing, and local permit rules — what a Downers Grove homeowner needs before buying a whole-home standby generator.
Free and no obligation. Your request goes to one established installer covering Downers Grove — never sold to a list of contractors.
Why Downers Grove Homeowners Buy Standby Generators
August 2020
The Midwest derecho drove 80+ mph winds across the region and cut power to more than 800,000 ComEd customers, roughly 58,000 of them in DuPage County; some areas waited 4–5 days for restoration. Downers Grove is ComEd-served, so it shares that regional outage exposure.
June 2021
An EF-3 tornado tracked through neighboring Woodridge and Darien — both immediately adjacent to Downers Grove — damaging about 900 structures and knocking out power to 22,000+ DuPage County customers. A whole-home standby generator restores power within seconds of an outage like this.
July 2024
A derecho sequence brought roughly 90 mph downburst gusts across DuPage and neighboring counties, comparable to the 2020 event — damaging wind storms recur here most years.
Each event above is documented northern Illinois storm history — dated events, not marketing. A standby generator turns on within seconds of an outage — no extension cords, no starting a portable unit in the rain.
Downers Grove at a Glance
$449,800
Median Home Value
$115,114
Median Household Income
75.2%
Homeownership Rate
62.0% of housing
Single-Family Homes
Downers Grove village, ACS 2024 5-yr. Census tables B25077 · B19013 · B25003 · B25024. Retrieved 2026-07-01.
What Does a Generator Cost in Downers Grove?
Downers Grove is in the Chicago-area labor market. Installed costs run higher than the national averages you will find on generic home improvement sites. For most Downers Grove homes, a 22kW Generac Guardian installed starts around $12,000 — permits excluded, standard site conditions.
| Generator | Starting Installed Price | Notes |
|---|---|---|
| 14kW Generac Guardian | $10,500 | Essentials or small whole-home. Tight on NG for 4-ton AC. |
| 18kW Generac Guardian | $11,900 | Good whole-home option for smaller homes. |
| 22kW Generac Guardian | $12,000 | Recommended for most 2,500 sq ft homes in Downers Grove |
| 24kW Generac Guardian | $12,500 | For larger homes or EV charger included. |
| 26kW Generac Guardian | $13,000 | Largest air-cooled residential option. |
Source: GSHA Services (serving Cook, DuPage, Lake, Will, Kane counties). Starting prices — permits excluded. Standard install = 10 ft gas and electric piping above grade. Long gas runs, panel upgrades, or difficult access add cost.
Recommended size for Downers Grove
For a typical Downers Grove home — about 2,500 sq ft with gas appliances and a 3–4 ton central AC — the recommended standby generator size is 22kW. That is the right call for most Downers Grove homes: a home that size needs more load headroom than a 14kW unit can reliably hold during a summer outage.
Want the full sizing math — why 14kW runs out of headroom and where 22kW gets its margin? See the complete generator sizing guide.
Still deciding? Weigh the 20-year cost of ownership and ROI, or learn how to compare installer quotes.
Downers Grove Permit Requirements
A permit is required; the Village of Downers Grove issues building permits. Fees are set by the village fee schedule and quoted at application.
For the metro-wide picture — verified fees by jurisdiction, who can pull the permit, ComEd vs. municipal electric, Nicor meter upgrades, and the inspection sequence — see the Chicago-area generator permits & utility guide.
| Requirement | Detail |
|---|---|
| Electric utility | ComEd |
| Gas utility | Nicor GasDowners Grove is served by Nicor Gas. If adding a generator exceeds your existing meter capacity, contact your gas utility to request a meter capacity review before installation. Allow 3–4 weeks for utility response. |
| Setbacks — NFPA 37 / manufacturer |
|
HOA Note
Downers Grove city permits do not override HOA covenants (CC&Rs). Some HOAs require board approval, screening requirements, or specific placement for generator installations. Check your CC&Rs before ordering equipment — this is a separate process from the city permit.
What Makes Downers Grove Different
Downers Grove homes are served by ComEd for electricity and Nicor Gas for natural gas. The Village runs an electricity municipal-aggregation program, but that only changes who supplies the power — ComEd still owns the lines and handles outages.
The Village has adopted the 2020 National Electrical Code, so your generator's transfer switch and wiring must meet NEC 2020 and be installed by a licensed electrician.
A licensed electrician must pull the electrical permit and perform the install — the Village issues electrical permits only to homeowners or qualified licensed contractors.
Comparing Installer Quotes in Downers Grove
The surest way to know a Downers Grove quote is fair is to put two or three comparable quotes side by side. These guides show what to check before you sign.
Guides to read before you sign
- How to compare installer quotes — a line-by-line checklist, the questions to ask, and the red flags.
- Transfer switches & load management — what stays on, and how a smaller unit can back your whole home.
- The warranty guide — what five years really covers, and what keeps it valid.
- The Chicago-area standby generator guide — costs, sizing, brands, and every city we cover.
Downers Grove Generator FAQ
Do I need a permit to install a standby generator in Downers Grove?
Yes, and the Village is specific about who may pull it: a licensed electrician must pull the electrical permit and perform the install, because Downers Grove issues electrical permits only to homeowners or qualified licensed contractors. Permit fees are set by the Village and quoted at application — confirm the current amount and submittal requirements on the Village permits page before ordering equipment.
I buy my electricity through the Village aggregation program. Does that change anything in an outage?
No. Downers Grove runs an electricity municipal-aggregation program, but that only changes who supplies the power you are billed for. ComEd still owns the lines and handles outages and restoration. Aggregation does not give the Village its own crews, and it has no effect on how a standby generator is permitted or installed.
What electrical code does my generator install have to meet?
The Village has adopted the 2020 National Electrical Code, so your generator’s transfer switch and wiring must meet NEC 2020 and be installed by a licensed electrician. This is worth confirming in writing on a quote — code edition drives transfer-switch selection and some of the wiring detail, and it is a common source of surprise when comparing bids from contractors working across multiple suburbs.
What size generator does a Downers Grove home need?
For most homes, 22kW is the typical recommendation. Air-conditioning startup surge usually determines the answer rather than square footage, and older housing stock with an undersized panel may need a service or panel upgrade alongside the generator. An installer should size the unit to your actual load rather than to a square-foot rule of thumb.