Alliant Energy (Wisconsin Power & Light) (Wisconsin Power & Light Co)

Last verified (benchmark): Feb 25, 2026
Last verified (tariff snapshot): Feb 25, 2026
EIA data year: 2024
EIA updated: Mar 4, 2026
Page updated: Feb 25, 2026

Alliant Energy (Wisconsin Power & Light), operating as Wisconsin Power & Light Co, is an investor-owned electric utility serving customers in Wisconsin. Wisconsin Power & Light (WPL); serves Janesville, Madison area, and south-central Wisconsin. PSC-approved 2025 rates.

This page brings together tariff-based rate information from our research, federal EIA statistics on sales and generation when available, and the cities and states this provider serves.

Residential rates

Tariff snapshot (Janesville, WI)

Customer charge: $16.77/mo
Energy charge (example tier): 14.02¢/kWh

Seasonal/tiered rates and riders may apply. Example tier used in our estimates.

alliantenergy.com· verified 2026-02-25

Example bill at 1,000 kWh (derived from tariff snapshot): $156.94/mo

Based on snapshot; excludes local taxes/fees; riders may vary.

For city-specific estimates (including water, sewer, trash), see Janesville's full breakdown

Typical bill benchmark (regulator / utility)

Typical residential bill at 1,000 kWh (example): $156.95/mo (15.70¢/kWh)

alliantenergy.com· verified 2026-02-25

Gs-1 residential: ~$0.5589/day customer charge + $0.13390/kWh + fuel adj ~$0.00627/kWh. Serves Janesville and south-central Wisconsin.

Benchmarks reflect typical delivered bills; tariff snapshots show a specific rate schedule component used in our estimates.

Our estimates use tariff and official rate data from utility and regulatory sources. See our methodology for how we calculate bill estimates.

EIA Form 861 & 860 data (2024)

Supplemental data from the U.S. Energy Information Administration. Our tariff-based rates above remain primary for bill estimates. EIA data provides context on scale and generation.

Residential statistics

Avg. price (EIA): 16.89¢/kWh; EIA "avg price" reflects the full delivered price over the year (including riders/delivery and seasonal effects), so it can be higher than a single tariff energy tier.
Residential sales: 3.5M MWh
Customers: 437.2K
Revenue: $596.5M

Generation mix (capacity)

27.9% renewable · 5,592.7 MW total

Natural gas2,497.5 MW
Subbituminous coal1,525.7 MW
Solar1,096.6 MW
Wind421.2 MW
Hydroelectric43.1 MW
Purchased steam8.6 MW

Sources: EIA-861 (sales, revenue, customers), EIA-860 (generation).

States & cities served

Cities in our dataset where this provider offers electric service. Click through to see utility cost estimates for each city.

Wisconsin

Janesville(used for tariff snapshot)

Data sources

Our research: Tariff documents, PSC/regulatory filings, and official utility rate schedules. Each city page cites sources and last-verified dates.
EIA (2024): Form 861 (sales, revenue, customers) and Form 860 (generation capacity by fuel). Supplementary context; our tariff-based rates remain primary for bill estimates.

Methodology · All providers

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