States › Iowa › Interstate Power and Light Co

investor-owned utility · EIA utility 9417

Interstate Power and Light Co

417,153 residential customers in Iowa · 84 counties in territory · balancing authority MISO

Form EIA-861, 2024 final2025 early release shown in trendMonthly to Jul 2026

Average residential price, 2024. Dial position: 91% of 1,230 US utilities had this price or lower. Ticks: Iowa and US averages.

Average price is revenue divided by sales for the sector and year; it is not a tariff rate. Reliability figures are as reported by utilities to EIA on Form 861 and may use different calculation methods. Annual figures: Form EIA-861 for 2024, final release. Monthly state figures run to July 2026.

Interstate Power and Light Co is an investor-owned utility that reported 417,153 residential customers in Iowa on Form EIA-861 for 2024, with a service territory that touches 84 counties.

Its average residential price that year was 17.90¢ per kilowatthour, 34% above the Iowa average of 13.40¢ and 8.6% above the US average of 16.48¢. The figure is residential revenue divided by residential sales, so it folds in fixed charges, riders and every rate schedule the utility bills under.

That works out to an average residential bill of $127.80 a month on average use of 714 kWh a month. Across Iowa the average bill was $111.54 on 832 kWh, so a bill gap reflects how much power households use as well as what each kilowatthour costs.

For reliability it reported a SAIDI of 116.3 minutes per customer with major event days included and 99.4 minutes with them excluded, calculated under another method. The median among Iowa utilities reporting was 85.7 minutes with major event days; this utility's figure is 36% above that median.

The average price is up 7.2% on 2019, against up 7.5% for Iowa as a whole, and little changed on 2023. EIA's early release for 2025, which has not been fully edited, shows 17.77¢.

17.90¢average residential price per kWhIowa 13.40¢ · US 16.48¢

$127.80average monthly residential billon 714 kWh a month

417,153residential customers504,146 customers in all sectors

116.3SAIDI minutes per customer, all eventsIowa median 85.7

Compared with Iowa, the US and other investor-owned utilities

Measure, 2024	This utility	Investor-owned utilities, US median	Iowa	United States
Average residential price per kWh	17.90¢	16.17¢	13.40¢	16.48¢
Average monthly residential bill	$127.80	$131.47	$111.54	$142.26
Average monthly use, kWh	714	787	832	863
Residential price change, 1 year	+0.2%	—	+0.7%	+3.0%
Residential price change, 5 years	+7.2%	—	+7.5%	+26.7%
SAIDI, all events (minutes)	116.3	278.7	85.7 median	184.5 median
SAIDI, without major event days	99.4	106.5	70.5 median	99.8 median

State and US prices, bills and use are EIA's own averages over every customer. The ownership column and the reliability columns are medians across utilities with at least 1,000 residential customers, computed on this site from the final 2024 file. Among the 3 filings by investor-owned utilities in Iowa, the median price was 15.53¢. In Iowa this utility's price ranks 1 of 22, counting from the highest.

Average price by year

Interstate Power and Light CoIowa averageUS average

Cents per kWh, nominal. The hollow point is EIA's 2025 early release, which has not been fully edited.

Year by year

Year	¢ per kWh	Iowa ¢	Monthly bill	kWh a month	Residential customers	All sales
2025 early release	17.77¢	13.72¢	$131.38	739	419,451	13.9 TWh
2024	17.90¢	13.40¢	$127.80	714	417,153	13.7 TWh
2023	17.86¢	13.31¢	$128.75	721	414,637	13.9 TWh
2022	17.75¢	13.15¢	$136.01	766	412,497	14.3 TWh
2021	16.84¢	12.73¢	$125.89	748	410,149	14.3 TWh
2020	16.61¢	12.46¢	$122.98	740	407,849	13.9 TWh
2019	16.70¢	12.46¢	$124.10	743	405,205	14.2 TWh
2018	15.85¢	12.24¢	$122.72	774	403,726	14.7 TWh
2017	15.27¢	12.34¢	$110.71	725	403,160	14.4 TWh
2016	14.77¢	11.94¢	$111.20	753	402,199	14.6 TWh
2015	14.06¢	11.63¢	$104.84	746	429,533	14.9 TWh
2014	13.36¢	11.16¢	$104.32	781	444,512	15.5 TWh
2013	13.44¢	11.04¢	$107.75	801	444,172	15.4 TWh

Bundled residential service only in the price, bill and use columns. Bill = residential revenue ÷ customers ÷ 12; use = residential sales ÷ customers ÷ 12. EIA describes its early release as not fully edited; it is shown for this utility alone and enters no average, median or rank on this site.

Month by month

Interstate Power and Light CoIowa average

Form EIA-861M monthly sample, bundled residential service in Iowa. Preliminary until EIA finalises the year. Latest: 20.73¢ in July 2026, average bill $225.01 on 1,086 kWh.

Sales by sector, 2024

Sector	Customers	Sales	Share of sales	Revenue	¢ per kWh, bundled
Residential	417,153	3.6 TWh	26%	$639,738,000	17.90¢
Commercial	85,663	4 TWh	29%	$537,537,000	13.42¢
Industrial	1,330	6.1 TWh	44%	$497,215,000	8.19¢

Customers, sales and revenue count every service type the utility reported (bundled, energy-only and delivery-only). The price column uses bundled service alone, because part-bill revenue would understate it. Sources of energy: 16.9 TWh in total, of which 70.1% was its own net generation and 5.1 TWh was bought wholesale; summer peak demand 2,833 MW.

Reliability

SAIDI, all events116.3 min

SAIDI, without major event days99.4 min

Minutes of sustained interruption per customer in 2024, as the utility reported them under another method. SAIFI: 1.08 interruptions per customer with major event days, 1.01 without; CAIDI 107.7 minutes per interruption. EIA's Iowa total across all reporting utilities was 166.7 minutes with major event days and 89.8 without. Major event days are storms and similar events that a utility's chosen method sets apart; methods differ, so treat comparisons as approximate. What SAIDI and SAIFI mean.

Year	SAIDI, all events	SAIDI, no major events	SAIFI, all events	SAIFI, no major events	Method
2025 early release	88.5	74.0	0.82	0.76	Other
2024	116.3	99.4	1.08	1.01	Other
2023	149.4	88.2	1.00	0.82	Other
2022	70.5	68.6	0.74	0.74	Other
2021	107.4	74.1	0.82	0.75	Other
2020	3,180.0	89.5	1.54	0.79	Other
2019	123.6	99.5	1.01	0.95	Other
2018	157.2	93.9	1.03	0.94	Other
2017	114.1	85.3	0.93	0.83	Other
2016	87.1	83.2	0.88	0.85	Other
2015	91.4	76.2	0.86	0.81	Other
2014	192.5	94.9	1.12	0.93	Other
2013	119.9	59.3	0.78	0.64	Other

Generation at plants it operates, 2025

Natural gas 41.7% 5.7 TWh
Wind 31.5% 4.3 TWh
Coal 21.2% 2.9 TWh
Solar 5.6% 758.7 GWh

Net generation of 13.7 TWh at power plants this utility operates, from Form EIA-923. It is not the mix delivered to customers: utilities also buy power wholesale (5.1 TWh in 2024), sell generation to others and may co-own plants that another company operates.

Counties in its service territory

Counties the utility listed on Form EIA-861 for 2024. Listing a county does not mean the utility serves all of it.

Other utilities in Iowa

Utility	Ownership	Residential customers	¢ per kWh	Monthly bill	SAIDI, all events	SAIDI, no major events
MidAmerican Energy Co	Investor-owned	710,254	10.90¢	$85.54	234.0	96.5
Linn County REC	Cooperative	30,323	14.23¢	$120.99	116.0	116.0
City of Ames	Municipal	24,979	12.10¢	$68.99	39.2	18.8
Eastern Iowa Light & Power Coop	Cooperative	20,749	13.56¢	$153.74	220.0	99.0
Cedar Falls Utilities	Municipal	17,772	10.42¢	$81.94	3.2	—
Midland Power Coop	Cooperative	11,939	13.60¢	$191.38	123.5	105.0
Maquoketa Valley Rrl Elec Coop	Cooperative	11,051	13.76¢	$145.65	133.5	70.9
Board of Water Electric & Communications	Municipal	10,123	12.63¢	$102.03	40.8	8.5

All Iowa utilities · Investor-owned utilities nationwide

Questions and answers

How much does electricity cost from Interstate Power and Light Co?

Residential customers paid an average of 17.90¢ per kilowatthour in 2024. EIA derives this by dividing residential revenue by residential sales; it is an average across all rate schedules and charges, not a tariff rate.

How does that compare with Iowa?

The Iowa average residential price in 2024 was 13.40¢ and the US average 16.48¢; Interstate Power and Light Co was 34% above the state figure. Among 22 utility filings with a bundled residential price in Iowa, it had the 1st highest.

What is the average Interstate Power and Light Co bill?

$127.80 a month in 2024, on average residential use of 714 kWh a month (annual revenue and sales divided by customers and by twelve). The Iowa average was $111.54 on 832 kWh.

How reliable is Interstate Power and Light Co service?

It reported 116.3 minutes of interruption per customer (SAIDI) including major event days and 99.4 minutes excluding them, with 1.08 interruptions per customer (SAIFI) in 2024. Utilities calculate these under differing methods, so comparisons are approximate.

Is the Interstate Power and Light Co price rising?

The average residential price was little changed in 2024 compared with 2023 and up 7.2% compared with 2019. EIA's early, not fully edited release for 2025 shows 17.77¢.

Which counties does Interstate Power and Light Co serve?

Its Form EIA-861 service territory lists 84 counties, including Adair County, IA, Adams County, IA, Allamakee County, IA, Appanoose County, IA, Benton County, IA and Black Hawk County, IA. A county can appear in several utilities' territories.

Provenance

Source: U.S. Energy Information Administration. Annual figures are from Form EIA-861 (sales to ultimate customers, reliability, operational data and service territory files), final release for 2024, respondent "Interstate Power and Light Co", utility number 9417; the 2025 row is from EIA's early release. Monthly utility figures are from the Form EIA-861M sample. State and US averages are from the Form EIA-861M sales and revenue workbook, published through July 2026. Generation by fuel is from Form EIA-923, 2025 final. All are US government works in the public domain. Page built 30 Sep 2026. Errors in processing are corrected at the next build; see corrections. For tariffs and rate schedules, consult the utility or the state utility commission.