EV Charging Load and Peak Risk Planner

Estimate EV charging load, energy use, and potential demand-charge exposure using simple assumptions.

Educational only. EV load behavior varies. Demand charges depend on tariff rules and whether EV load sets the monthly peak.

Processed in-browser. Nothing is stored.

Inputs

% of ports charging at peak

$

Demand Exposure (optional)

$

EV peak vs billing peak overlap

Show warning if exceeded

Results

Enter inputs and click Calculate

How to use this tool

  1. 1Enter number of ports and power per port.
  2. 2Enter a concurrency factor (what % of ports charge at the same time).
  3. 3Enter sessions per day and kWh per session to estimate monthly kWh.
  4. 4Enter blended energy rate and demand rate (if applicable).
  5. 5Review results and use them to size pilots and set charging policies.

What the results mean

EV charging can raise costs in two ways: more kWh (energy cost) and higher monthly peak kW (demand cost).

Load management (power sharing, caps, TOU pricing) is usually the cheapest lever.

Common pitfalls

  • Assuming all ports charge simultaneously (overstates peak)
  • Ignoring demand charges entirely (understates risk)
  • No metering or billing plan (cost recovery becomes messy)
  • Not planning maintenance ownership (uptime drops)

Change log

v1.0 (2026-01): Latest release