Why Centennial homeowners call an electrician
Centennial is one of the youngest cities in the country. It didn't incorporate until 2001, joining together suburban neighborhoods that had already grown out from Denver decades before. So the city is new on paper, but the homes aren't. The largest share were built in the 1970s, and most of the rest went up in the 1980s and 1990s. A house in this "new" city is often a fifty-year-old home running on the electrical it was built with. That gap is what brings two very different projects to the same homes. The older parts of town tend to bring panel worries. The newer parts tend to bring capacity worries. When your part of town was built usually decides which one you're facing.
An old or flagged panel
When a panel gets flagged at a sale, a home inspection, or an insurance review, you have two questions. Is yours one of the problem brands, and what does it take to clear it? A handful of panel brands from past decades carry a documented design pattern, not isolated bad luck. The breakers can fail to trip on an overload or a short. So the panel that's supposed to be the home's main protection can't be counted on. Federal Pacific Electric (FPE) Stab-Lok panels and Zinsco panels draw the most concern and the sharpest insurance attention. They line up with exactly the years Centennial's dominant stock was built. The defect is built into the panel itself, so swapping a single breaker doesn't fix it. The panel is the fix.
Those problem-brand panels can also become an issue at a home sale or an insurance review, and replacing the panel clears the flag.
Not every old panel is a problem. Square D (QO and Homeline), GE, Siemens (ITE), Murray, and Cutler-Hammer panels went into Centennial homes alongside the flagged ones, and those generally aren't the brands insurers raise.
A service that can't carry a new load
The other project starts the opposite way. You buy an EV, get a heat-pump quote, swap to an induction range, or finish a basement, and you find out the existing service can't take the added load. The same fifty-year-old homes run on the 100-amp service they were built with. A Level 2 EV charger is a continuous electrical load that an original service was never sized for. The wiring and breaker for it get sized above the charger's running draw. Add that on top of everything the home already runs, and a 100-amp service can run short, which is what a service change resolves.
An open breaker slot looks like spare room, but you can't tell from the slot whether your service can carry a new load. That depends on everything the home already draws. We work that out by looking at your actual service for your specific home, not the open slot. A heat pump, an induction range, an addition, or a finished basement adds load the same way and gets the same look.
Which Centennial homes tend to have which panel
Centennial's parts of town sort fairly cleanly by the years they were built, and the panel brands common in each era sort with them. Where they haven't been replaced, here's what tends to be behind the cover.
| Centennial part of town | Built | Panels commonly from that era, and where to read more |
|---|---|---|
| The 1970s neighborhoods, the largest share of the city, such as Willow Creek, Homestead Farm, and Piney Creek | 1970s, now around fifty years old | The heaviest concentration of Federal Pacific (Stab-Lok) and Zinsco-era panels, the brands that draw the sharpest insurance and sale concern; also the aluminum-branch-wiring window → FPE / Zinsco pages |
| The 1980s neighborhoods | 1980s | Still within the problem-panel window, a decade newer; flagged brands commonly present → FPE / Zinsco pages |
| The 1990s and newer parts of town | 1990s to post-2000 | Newer panels, generally sound. Here the issue is more often capacity, original service pushed by modern loads → service change |
Square D, GE, Siemens, Murray, and Cutler-Hammer panels went in alongside the flagged brands across these same decades. The map points to what's common in an era, not what's in your panel. The only way to know is to have someone open it up and look.
Backup power for an outage
We install manual transfer switches for standby generators, so when the power drops you can run the circuits that matter. If backup power is on your list, that's the piece we handle.
What we handle so your project passes inspection. Centennial's boundaries are irregular, so a home with a Centennial mailing address can actually sit in unincorporated Arapahoe County and permit through the county instead of the city. A property is also served by either Xcel Energy or CORE Electric Cooperative, which coordinate a service upgrade differently. And along Cherry Creek and Little Dry Creek, a home in a mapped flood area may need electrical equipment below the flood line relocated. We confirm the jurisdiction and the utility for your address, account for the current code, and handle the permit and inspection as part of the project.
Code and jurisdictional references on this page apply to Colorado's Front Range. If you're outside this area, do not rely on them; consult a locally licensed professional.
Common questions from Centennial homeowners
Is my Centennial address in the city or in unincorporated Arapahoe County?
Centennial's irregular boundaries leave pockets of unincorporated Arapahoe County wrapped inside them, so a Centennial mailing address can sit under county authority and permit through the county rather than the city. We confirm the correct authority for your address and pull the permit as part of the work.
Who provides my electric service in Centennial?
A Centennial property is served by either Xcel Energy or CORE Electric Cooperative, depending on the address. The two coordinate a service upgrade differently. We confirm the serving utility for your address before we scope the project.
A home inspection flagged my electrical panel. Do I have to replace it?
Not always. Some panel brands from past decades carry a documented problem and are worth replacing; others from the same years are generally sound. The flag is a reason to have a licensed electrician look at your specific panel, which tells you whether yours needs to be replaced.
Can my current service handle an EV charger?
That depends on your home's full electrical load, not an open breaker slot. An EV charger is a continuous load added on top of everything else, so for an EV we run a load calculation to confirm your service can carry it or needs to grow to a larger one.
Will replacing my panel or finishing my basement trigger code updates?
It can. A panel or service replacement and a significant remodel can bring in added code requirements. We account for what the current code requires as part of the work, so it's right and it passes inspection.
I smell something burning or hear buzzing at the panel. What should I do?
A burning smell, buzzing, or repeated flickering is worth a real look rather than a guess. If you have an active hazard, get to safety first. When it's safe, schedule a visit and we'll find out what's going on.
Schedule a visit
Tell us what's going on with your panel or your project and we'll set up an on-site assessment. We confirm who handles your project and what comes next, and you talk to a licensed electrician, not a call center.
Sources
- Consumer Product Safety Commission — documented design patterns for Federal Pacific Electric Stab-Lok and Zinsco panels
- Carrier underwriting guidance and documented homeowner cases — flagged-panel impact on binding, renewal, and home sales (consequence, not advice)
- City of Centennial and Arapahoe County — residential electrical permit and inspection authority, including the unincorporated-county enclaves within the city, on the Colorado-adopted current code
- Xcel Energy and CORE Electric Cooperative — serving-utility territories and meter/interconnection requirements across Centennial
- Federal Emergency Management Agency (FEMA) and City of Centennial floodplain regulations — base-flood-elevation requirements for substantial improvements in the mapped Cherry Creek and Little Dry Creek flood areas
General educational information about residential electrical patterns in Centennial, Colorado. Every home is different, and nothing here is a diagnosis for any specific property. The only way to know a home's condition is an on-site look. Dunlap Electric Company, LLC · Colorado Electrical Contractor License #8223 · In the electrical trade since 1998.
Looking for another part of our service area? See our service area.