Wisconsin Power & Light (Alliant Energy) Rate Selection Guide
Wisconsin Power & Light, an Alliant Energy company, serves about 500,000 electric customers (plus gas) across southern and central Wisconsin under PSCW regulation. AMI smart meters provide near-real-time hourly usage viewable in the My Account portal with Excel export and up to 36 months of billing history; there is no Green Button, public API, or EDI, so C&I data access relies on the portal, Energy Analytics, and business guest-user access.
Wisconsin Power & Light (Alliant Energy) Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| Gs-1 (General Service) | Commercial, no demand | $0.7808/day + $0.13590/kWh | Small commercial sites without significant demand |
| Gd-1 (General Service Demand) | Commercial, TOU + demand | $0.7808/day; demand $10.80/kW on-peak + $2.75/kW | Mid-size commercial with metered demand |
| Cg-2 TOD (Commercial TOU) | Commercial, TOU + demand | $1.5452/day; demand $16.80/kW on-peak + $3.10/kW | Commercial demand customers managing peak usage |
| Cp-1 (Industrial Power) | Industrial, TOU + demand | $6.5753/day; demand $20.54/kW on-peak + $3.17/kW | Industrial loads over 200 kW |
Market Overview
Fully regulated by the PSCW with no retail electric choice. Base rates for 2026 and 2027 were approved in PSCW docket 6680-UR-125 (order dated 12/18/2025), with new rates effective January 1, 2026. Fuel costs are recovered through a separate fuel-cost mechanism.
Need to pull your actual usage data to compare rates? See the Wisconsin Power & Light (Alliant Energy) Data Access Guide →
Current Rate Schedules
WPL electric rates are set by the PSCW. C&I customers pay a daily customer charge plus per-kWh energy charges, and demand-based schedules add on-peak and customer demand charges (per kW). The figures below are from Alliant Energy's Wisconsin Schedule of Electric Rates, all effective January 1, 2026 under PSCW docket 6680-UR-125. Gas C&I rates are set in the same docket; see the gas tariff for current figures.
Effective: January 1, 2026 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Gs-1 - General Service | commercial | General nonresidential service without demand metering (smaller commercial loads). | Customer charge $0.7808/day (single phase) or $1.1712/day (three phase); energy charge $0.13590 per kWh; 2.5% primary-voltage discount available. Effective 01/01/2026. | — |
| Gd-1 - General Service Demand | commercial | General nonresidential service with demand metering (mid-size commercial). | Customer charge $0.7808/day (single) / $1.1712/day (three phase); TOU energy High $0.17314, Regular $0.09914, Low $0.06214 per kWh; On-peak Demand $10.80/kW, Customer Demand $2.75/kW; energy limiter $0.14800/kWh effective. Effective 01/01/2026. | — |
| Cg-2 TOD - Commercial Service Time-of-Use | commercial | Commercial demand customers on time-of-use pricing. | Customer charge $1.5452/day (single) / $2.3178/day (three phase); energy High $0.11934, Regular $0.05714, Low $0.04394 per kWh; On-peak Demand $16.80/kW, Customer Demand $3.10/kW; energy limiter $0.19200/kWh effective; primary-voltage discounts apply. Effective 01/01/2026. | — |
| Cp-1 - Industrial Power (Primary/Secondary) | industrial | Customers with measured maximum demand over 200 kW for at least 8 of 12 months; service up to 25,000 volts. | Customer charge $6.5753/day; energy High $0.09272, Regular $0.04940, Low $0.03696 per kWh; On-peak Demand $20.54/kW, Customer Demand $3.17/kW; energy limiter $0.18700/kWh effective; primary-voltage discounts apply. Effective 01/01/2026. | — |
| Gas C&I Service (General/Firm) | commercial | Commercial and industrial natural gas customers (WPL gas territory). | Fixed monthly facility charge plus per-therm distribution charge, with a separate gas-cost recovery pass-through; current per-therm figures are in the WPL gas tariff (PSCW docket 6680-UR-125, effective 01/01/2026). | — |
Rate Recommendations by Use Case
Small commercial site (low/no demand)
A small office, retail or service business without significant peak demand.
Gs-1 has a low daily customer charge ($0.7808) and a flat $0.13590/kWh energy rate with no demand charge, which suits small steady loads.
- Export monthly usage to Excel to benchmark consumption
- Enable Paperless Billing for 36 months of bill history
Mid-size commercial with metered demand
A facility with meaningful peak demand that can benefit from TOU pricing.
Demand schedules trade a lower energy rate for per-kW demand charges; Gd-1 ($10.80/kW on-peak) suits moderate demand while Cg-2 TOD ($16.80/kW) fits customers who can actively manage peaks.
- Use Energy Analytics to identify and shave peak demand
- Shift flexible load out of the 10 a.m.-10 p.m. on-peak window
Industrial load over 200 kW
An industrial plant with sustained demand above 200 kW for most of the year.
Cp-1 carries the lowest per-kWh energy charges (High $0.09272) in exchange for the highest demand charges ($20.54/kW on-peak, $3.17/kW customer demand); high-load-factor industrials come out ahead, especially with primary-voltage discounts.
- Pursue primary-voltage service for the 2.5% discount + $0.36/kW credit
- Invest in demand management/storage to limit the on-peak kW
- Request a Business Resource Center rate analysis to confirm Cp-1 vs Cg-2 TOD
Historical Rate Trends
WPL base electric and gas rates for 2026 and 2027 were approved by the PSCW in docket 6680-UR-125 (order dated 12/18/2025), with new rates effective January 1, 2026 and a further step on January 1, 2027. Fuel costs are recovered through a separate fuel-cost plan.
January 1, 2026
2026 base-rate increase approved in PSCW docket 6680-UR-125 (e.g., Cp-1 on-peak demand $20.54/kW, Cg-2 TOD on-peak demand $16.80/kW).
see docket 6680-UR-125January 1, 2027
Second-step base-rate change scheduled for 2027 under the same approved rate review.
see docket 6680-UR-125Overall trend: Base rates increased for 2026 with another step in 2027 per the approved rate review; fuel/gas-cost recovery adjusts separately.
Next expected change: Second-step base-rate change effective January 1, 2027 under docket 6680-UR-125; next full rate review thereafter.
Cost Optimization Strategies
On WPL demand and TOU schedules, demand charges (per kW) and on-peak energy are the largest controllable costs. Savings come from shaving peak demand, shifting load to off-peak/low-rate periods, taking primary-voltage service where feasible, and confirming the lowest-cost qualifying schedule.
Reduce peak demand (kW)
For: Demand-metered C&I (Gd-1, Cg-2 TOD, Cp-1)
Stagger equipment startup, use demand controls/storage, and flatten the load profile to cut the on-peak demand charge ($10.80-$20.54/kW depending on schedule).
Shift load to off-peak / low-rate periods
For: TOU schedules (Gd-1, Cg-2 TOD, Cp-1)
Move flexible loads into Regular/Low TOU windows; on-peak demand applies 10 a.m.-10 p.m. weekdays.
Take primary-voltage service
For: Larger C&I capable of primary metering
Where the customer owns/operates substation equipment at primary voltage, take the 2.5% energy/demand discount plus $0.36/kW customer-demand credit.
Confirm the optimal schedule
For: All C&I accounts
Use Energy Analytics and the Business Resource Center's free rate analysis to verify Gs-1 vs Gd-1 vs Cg-2 TOD vs Cp-1 is lowest cost for your load.
To implement these strategies, you need your 15-minute interval data. Learn how to download Wisconsin Power & Light (Alliant Energy) interval data →
Frequently Asked Questions
Can a C&I customer get hourly interval data from Wisconsin Power & Light?▾
Yes, to a point. AMI smart meters let business customers view near-real-time hourly electric usage in the My Account portal and Energy Analytics, with Excel export of monthly/daily summaries (up to 13 months). However, there is no Green Button or API feed and no sub-hourly (15-minute) data exposed, so automated/programmatic interval retrieval is not available.
Is there an API or Green Button for automated data?▾
No. WPL/Alliant does not offer Green Button (DMD or CMD), a public API, or aggregator partnerships. Third parties use business guest-user access to view Energy Analytics and manually export to Excel, or receive customer-authorized data delivery via the Business Resource Center.
How does a third-party consultant access a business customer's data?▾
The account holder requests a guest user through the Business Resource Center, providing the consultant's name, company, email and data scope. Alliant issues guest credentials; the guest can then view Energy Analytics and export usage to Excel, but cannot change account, billing or payment settings. Access is revocable anytime.
Which rate schedule fits a commercial or industrial site?▾
Small commercial loads typically take General Service (Gs-1) or General Service Demand (Gd-1). Larger demand customers take Commercial Service Time-of-Use (Cg-2 TOD), and customers above 200 kW for 8+ months take Industrial Power (Cp-1). The Business Resource Center offers free rate analysis to confirm the lowest-cost option.
How much billing history can we pull for a facility?▾
Business usage history is up to 13 months and bills are retained up to 36 months with Paperless Billing. Enable Paperless Billing for the longest retention, and export monthly usage to Excel for external benchmarking.
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