Load calculations are required, not optional
In unincorporated Arapahoe County, an EV charger needs its own permit and an electrical service load calculation. That is good practice anywhere; here it is on paper. If the calculation shows the panel is tight, a lower-amperage setting or a load-management device can often avoid a service upgrade.
Charging on Xcel or CORE
On Xcel’s side of the county, the rule is simple: charge outside 5–9 pm on weekdays. On CORE’s side, ask CORE about current EV rates or programs; co-op offers are set by CORE’s board and differ from Xcel’s.
Long commutes from the east county make a Level 2 charger more useful than a wall outlet — a full overnight charge instead of a partial one.
Solar, chargers and backup together
If you’re adding solar at the same time, plan the charger into the solar design. In unincorporated areas each piece is a separate permit, and designing them together avoids conflicting panel work. For a vehicle that supports it, our bidirectional systems, from about $19,000, let the car back up the house.
The federal §30C charger credit ended for chargers placed in service after June 30, 2026.
FAQ
Questions we hear
Do I need a load calculation to install an EV charger in unincorporated Arapahoe County?
Yes. The county requires an electrical service load calculation with the separate charger permit.
My new house in unincorporated Arapahoe County was built after 2024. Is it EV-ready?
Homes permitted under the county’s code effective July 9, 2024 must meet EV-charging provisions, which usually makes a charger install simpler. We confirm what was actually installed before quoting.
What’s the cheapest time to charge on Xcel in Aurora or Centennial?
Any time outside 5–9 pm on non-holiday weekdays, when Xcel’s on-peak price is about 2.7 times off-peak.
Does CORE have special EV rates?
Ask CORE directly; co-op rates and programs are set by its board and change independently of Xcel’s.