Alliant Energy (IPL) electric rates and bills in Iowa

Alliant's residential price in three periods

Interstate Power and Light Company (IPL) is the Iowa utility of Alliant Energy, an investor-owned utility with 419,451¹ residential customers in 2025. EIA publishes three figures that answer "Alliant Energy rates per kWh", and each covers a different stretch of time.

The full-year 2025 average, from the EIA-861 survey of every utility, was 17.77¢ per kWh¹. EIA's monthly sample gives 18.37¢ per kWh for the last 12 months (September 2025 to August 2026) and 21.48¢ per kWh² for August 2026³ alone. Months from January 2026 onward are preliminary.

All three are average revenue per kWh: what Alliant's residential customers paid in total, divided by the kWh they used. That total takes in the fixed monthly charge, the energy charges and the riders that recover fuel and other costs, so none of the three matches a rate printed in Alliant's tariff. The August 2026³ figure is one summer month and sits well above the other two; the section on summer explains why.

Iowa's dearest large utility, a typical US price

Among the 9 Iowa utilities with 10,000 or more residential customers, Alliant was the highest in 2025, and MidAmerican Energy, which serves 51.0% of the state's homes against Alliant's 33.4%, was the lowest at 11.21¢ per kWh. The gap between the two, 6.56¢ per kWh, is the whole of Iowa's range among its larger utilities. Iowa's cooperatives averaged 13.61¢ per kWh and its municipal and other public utilities 12.22¢ per kWh¹.

Outside Iowa the picture changes. Of the 177 US utilities with 100,000 or more residential customers reporting a full-service price, Alliant ranked 51st highest of 177, and the median of that group was 15.07¢ per kWh. Its average was 0.1% below the national average for investor-owned utilities, which stood at 17.78¢ per kWh¹ in 2025. Alliant is priced like an average American investor-owned utility in a state whose overall average, 13.62¢ per kWh, ranked 16th lowest⁴.

MidAmerican Energy (IA)11.21¢

Alliant Energy (IPL) (IA)17.77¢

Alliant Energy (WPL) (WI)18.47¢

Source: EIA-861 annual electric power industry report, 2025 final. EIA-861 2025 final. Average revenue per kWh is all charges divided by kWh; it is not a tariff rate.

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Utility	average residential price (bundled customers)
MidAmerican Energy (IA)	11.21¢
Alliant Energy (IPL) (IA)	17.77¢
Alliant Energy (WPL) (WI)	18.47¢

Lower use than most Iowa homes, a higher bill

An Alliant home used 739 kWh a month on average in 2025, less than the Iowa average of 861 kWh across all providers, yet paid $131.38 against the state's $117.30⁵. A MidAmerican home used 828 kWh and paid $92.85¹. Over the last 12 months (September 2025 to August 2026) Alliant's average bill was $136.45 for 743 kWh² a month.

MidAmerican Energy (IA)$92.85

Alliant Energy (WPL) (WI)$128.22

Alliant Energy (IPL) (IA)$131.38

Source: EIA-861 annual electric power industry report, 2025 final. EIA-861 2025 final. Average revenue per kWh is all charges divided by kWh; it is not a tariff rate.

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Utility	average monthly residential bill
MidAmerican Energy (IA)	$92.85
Alliant Energy (WPL) (WI)	$128.22
Alliant Energy (IPL) (IA)	$131.38

Because the average spreads the fixed monthly charge over every kWh, smaller users pay more per kWh than the average and larger users less. A household's own bill depends on its rate schedule and its use, not on the utility-wide figure.

Rate increase: a small dip in 2025, higher in 2026

From 2024 to 2025 Alliant's residential average went from 17.90¢ per kWh to 17.77¢ per kWh, a fall of 0.7%, while the Iowa average across all providers rose 1.6%⁴. The bill moved the other way, from $127.80 to $131.38 (+2.8%), because use per home climbed from 714 kWh⁶ to 739 kWh¹ a month.

The monthly survey shows prices rising again since. The last 12 months (September 2025 to August 2026) averaged 18.37¢ per kWh, above the 2025 figure, and August 2026³ came in +3.2%² against the same month a year earlier. All 2026 months are preliminary until EIA's annual survey replaces them.

Alliant Energy (IPL)Iowa average, all providers

Source: EIA-861M monthly sales and revenue by utility; EIA, Electric Power Monthly / EIA-861M sales and revenue by state. Residential revenue divided by kWh in each month, as reported to EIA's monthly survey (EIA-861M; months since January 2026 preliminary).

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Month	Alliant Energy (IPL) (¢/kWh)	kWh per customer	Bill per customer
January 2025	16.63¢	894	$148.60
February 2025	16.22¢	772	$125.23
March 2025	15.40¢	628	$96.70
April 2025	15.50¢	539	$83.44
May 2025	16.09¢	555	$89.24
June 2025	19.84¢	848	$168.32
July 2025	20.27¢	1,032	$209.31
August 2025	20.82¢	915	$190.40
September 2025	17.69¢	690	$122.04
October 2025	18.09¢	585	$105.89
November 2025	17.32¢	629	$108.96
December 2025	16.59¢	853	$141.57
January 2026	16.56¢	902	$149.39
February 2026	17.64¢	682	$120.33
March 2026	17.51¢	636	$111.46
April 2026	17.11¢	559	$95.66
May 2026	16.83¢	612	$103.03
June 2026	20.61¢	782	$161.25
July 2026	20.73¢	1,086	$225.01
August 2026	21.48¢	897	$192.65

Alliant's current electric base rates come from its last rate case before the Iowa Utilities Commission. In September 2024 the commission approved a settlement that includes a conditional moratorium on electric rate base increases through October 2029. In August 2026, reviewing actual costs after the new rates took effect, the commission found the electric results within the expected range and changed only natural gas rates. A moratorium on rate base does not by itself fix the bill: fuel and other cost-recovery charges still move with costs and use. The guide to rate cases explains how such decisions reach a bill.

Summer: more kWh, and dearer ones

Over the last 12 months, use per Alliant home ranged from 559 kWh in April 2026 to 1,086 kWh in July 2026. The average bill rose much more steeply, from $95.66 to $225.01²: use roughly doubled, the bill more than doubled. Summer kWh therefore carried a higher average price than spring kWh.

690Sep

585Oct

629Nov

853Dec

902Jan

682Feb

636Mar

559Apr

612May

782Jun

1,086Jul

897Aug

Source: EIA-861M monthly sales and revenue by utility. kWh per residential customer in each month (EIA-861M; months since January 2026 preliminary). The table adds the average bill and price for the month.

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Month	kWh per customer	Bill per customer	¢/kWh
September 2025	690	$122.04	17.69¢
October 2025	585	$105.89	18.09¢
November 2025	629	$108.96	17.32¢
December 2025	853	$141.57	16.59¢
January 2026	902	$149.39	16.56¢
February 2026	682	$120.33	17.64¢
March 2026	636	$111.46	17.51¢
April 2026	559	$95.66	17.11¢
May 2026	612	$103.03	16.83¢
June 2026	782	$161.25	20.61¢
July 2026	1,086	$225.01	20.73¢
August 2026	897	$192.65	21.48¢

This is why the August 2026 average, 21.48¢ per kWh, sits so far above the 12-month 18.37¢ per kWh. A single summer month is not a guide to the year; compare it only with the same month a year earlier, which is what the +3.2%² change does. For the Iowa market as a whole, August 2026 averaged 17.06¢ per kWh, +10.2%³ on a year earlier.

Rooftop solar and time-of-use

Alliant has more rooftop solar per customer than its Iowa neighbour. EIA's 2025 meter data list 12,379 residential net-metered installations totalling 100.1 megawatts, or 29.5 per 1,000 residential customers, against 7.8 per 1,000 at MidAmerican and 12.4⁷ at Alliant's Wisconsin utility.

Nearly every meter is an advanced (AMI) meter (99.4%), which allows time-based pricing. 17,154 residential customers, 4.1% of the total, were enrolled in a time-of-use rate in 2025, against 0.0%⁷ at MidAmerican. The time-of-use guide shows how shifting use changes a bill on such a rate.

Outages

Alliant's Iowa customers averaged 89 minutes without power in 2025 counting all events, fewer than the Iowa average of 152 minutes, and 74 minutes excluding major event days. Each customer saw 0.82 interruptions on average, against 1.03⁸ statewide. Alliant reports under another method (not IEEE 1366), so its minutes are not strictly comparable with utilities that follow the IEEE standard.

Alliant in Wisconsin: same parent, different trend

Alliant Energy's other utility, Wisconsin Power and Light, serves 440,746 residential customers in Wisconsin. Its 2025 residential average was 18.47¢ per kWh, +9.4% on 2024, while the Iowa utility's fell 0.7%¹. Over the last 12 months (September 2025 to August 2026) the Wisconsin utility averaged 18.93¢ per kWh and the Iowa one 18.37¢ per kWh². The two are regulated separately, by each state's commission, so their prices follow different decisions; the Alliant Energy Wisconsin page covers the other half.

Business customers

Alliant's 85,846 commercial accounts paid 15.05¢ per kWh on average in 2025, and its 1,201 industrial accounts 8.75¢ per kWh, with the average industrial bill at $36,817.10 a month. Across all customer classes the average was 13.03¢ per kWh¹.

Where Alliant serves, and help with bills

EIA's territory records list Alliant in 84⁹ Iowa counties, and in every one of them at least one other utility also reports customers, whether another investor-owned utility, a cooperative or a municipal utility. Iowa has no retail choice for homes, so a county or town name does not settle which utility serves a house; Alliant's own service-area map decides by address.

Alliant Energy (IPL) onlyAlliant Energy (IPL) and other utilitiesOther utilities

Source: EIA-861 2025, service territory; Census Bureau, Cartographic boundary file, counties. EIA-861 2025 service territory: 84 counties. Counts whole counties even where the utility serves only part of one; check the utility's own service-area map for an address.

Iowa received $58.8 million¹¹ in federal LIHEAP heating and cooling assistance for fiscal year 2026, which helps eligible households with energy bills. For prices across the state, see electricity in Iowa and the MidAmerican Energy page.