ForgeAsset / Utilities / Madison Gas and Electric (MGE)

Madison Gas and Electric (MGE) Cg-2 — EV fast-charging electricity cost

MGE Cg-2 is the filed rate schedule ForgeAsset models for DC fast-charging sites in Madison Gas and Electric territory in Wisconsin. Energy prices at 9.2¢/kWh–11.7¢/kWh by time of day; the demand side bills $17.72/kW of monthly peak. For one reference Supercharger site held constant across the whole library, that works out to 49.5¢/kWh per dispensed kWh — rank 64 of 86 filed tariffs (1 = least expensive).

Modeled rates

Madison Gas and Electric's commercial time-of-use rate: three daytime pricing windows that map directly onto the wizard's three rate fields, against the heavier of the utility's two demand figures — the tariff's low-load-factor provision halves the demand rate for qualifying sites, and the un-halved rate is carried here because the provision lapses once load factor reaches 15% in two months of twelve. Figures fold Madison's 5.5% combined sales taxes. Wisconsin's 3¢/kWh charging excise is carried separately in the state tax profile. An ordered rate step takes effect January 2027.

The filed rate book for this territory records no EV-specific commercial rate, so the modeled cost is the standard schedule. Demand follows the model's conservative convention — 150 kW per stall billed every month, the worst-case coincident peak — so a site whose metered peak runs below that would see a lower demand line.

Source: Madison Gas and Electric (MGE) filed rate schedule. Rates are digit-verified against the utility's own filed sheets and update within two weeks of any revision; derivations are on the methodology page.

What the reference site pays here

Reference site: 8 Tesla V4 stalls at 235 kWh/stall/day (57,183 kWh dispensed per month), a 150kW per-stall demand assumption, the model's default time-of-use mix, and a 12% loss gross-up — identical to the full utility ranking, where this tariff sits at position 64 of 86.

The rest of the Wisconsin picture

The tariff is one layer. State taxes, incentives, clean-fuels programs, and the charging market shape the remainder — Tesla Supercharger ROI in Wisconsin covers them, and the US Supercharger Economics Map shows every US Supercharger over utility territories colored by this same effective-cost derivation.

Madison Gas and Electric (MGE) Cg-2 — questions

What does Madison Gas and Electric (MGE) charge for energy on Cg-2?

The modeled rates are 9.2¢/kWh–11.7¢/kWh by time of day. At the model's default time-of-use mix (30% peak, 45% off-peak, 25% super-off-peak) that blends to 11.0¢/kWh.

Does Cg-2 carry a demand charge?

Yes: $17.72/kW of monthly peak. For a reference 8-stall site at 150 kW per stall that comes to about $21,262 per month.

What does electricity cost per kWh dispensed on this tariff?

For the reference site — 8 Tesla V4 stalls dispensing 235 kWh per stall per day, with a 12% loss gross-up — the all-in utility cost works out to 49.5¢/kWh per dispensed kWh, rank 64 of 86 tariffs in the library (1 = least expensive).

ForgeAsset is software, not investment, tax, or legal advice — outputs are model estimates from your inputs, not guarantees. Rates current as of research; verify current terms with the utility's filed schedule before committing capital.