Imperial Irrigation District (IID) electric rates and bills
Imperial Irrigation District's 142,916 residential customers in California paid an average of 18.69¢ per kWh in 2025, for an average bill of $202.30 a month on 1,083 kWh.1 Over the last 12 months (Sep 2025–Aug 2026) the average was 20.20¢, and 16.24¢ in August 2026.2
EIA-861 2025 final (released October 7, 2026) and EIA's monthly utility survey through August 2026 (preliminary); next monthly update expected November 24, 2026. Averages are revenue divided by kWh, all charges included: not the rate printed in a tariff.
3 of 58 California counties served (EIA-861 2025)
Imperial Irrigation District's residential customers paid an average of 18.69¢ per kWh in 2025, 40.4% below the California average, yet their average bill of $202.30 a month was higher than at SCE or SDG&E. The reason is volume: an IID home bought 1,083 kWh1 a month, more than twice the California average, and 2,127 kWh in August 20262.
IID's average price per kWh, period by period
EIA classifies the Imperial Irrigation District as a public power district: a public agency that sells both the electricity and its delivery to all of its 142,9161 residential customers. There is no separate supplier or delivery-only group, so one residential average covers every home on its lines. That average is average revenue per kWh, meaning everything IID billed residential customers divided by the kWh they bought; it is not a line on IID's rate schedule.
- Calendar 2025 (EIA-861, final): 18.69¢ per kWh1, up from 17.91¢ per kWh3 in 2024.
- Last 12 months, September 2025 to August 2026 (EIA-861M, 2026 months preliminary): 20.20¢ per kWh.
- August 20264 alone (preliminary): 16.24¢ per kWh, −0.3%2 against the same month a year earlier.
The single-month figure moves with the season: in high-use summer months the fixed monthly charge is spread over many more kWh, which lowers the average per kWh. Comparing one month with the 12-month figure mixes a season with a full year.
Within California, IID's 2025 average was the 3rd lowest of the 25 utilities with 10,000 or more residential customers; the lowest, Turlock Irrigation District, averaged 17.40¢ per kWh. Nationally the position is different: IID ranked 43rd highest of 177 large US utilities, whose median was 15.07¢ per kWh, and its average was 29.0% above the national average for public power1.
A low price per kWh, a high monthly bill
IID homes used 1,083 kWh a month on average in 2025. California's average was 494 kWh, the lowest among the states, and the US average 874 kWh5. Homes at two other large California public utilities used less: 751 kWh at Modesto Irrigation District and 663 kWh1 at SMUD.
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.
Show the numbers
| Utility | average monthly residential use |
|---|---|
| SDG&E (CA) | 367 |
| PG&E (CA) | 464 |
| Southern California Edison (CA) | 474 |
| SMUD (CA) | 663 |
| Modesto Irrigation District (CA) | 751 |
| Imperial Irrigation District (CA) | 1,083 |
A low price times high use still makes a high bill. IID's average residential bill was $202.30 in 2025, against $149.07 for Southern California Edison's full-service customers, $167.87 for SDG&E's and $173.951 for PG&E's, although each of those utilities' average price per kWh was well above IID's. California's average bill across all providers was $154.73 and the US average $150.685.
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.
Show the numbers
| Utility | average monthly residential bill |
|---|---|
| SMUD (CA) | $125.42 |
| Southern California Edison (CA) | $149.07 |
| SDG&E (CA) | $167.87 |
| Modesto Irrigation District (CA) | $173.07 |
| PG&E (CA) | $173.95 |
| Imperial Irrigation District (CA) | $202.30 |
The comparison with SCE and SDG&E covers their bundled customers only, those who buy both power and delivery from the utility. Many homes on their wires buy power from a community choice aggregator instead; their delivery-only figures are on those utilities' pages and cannot be compared with IID's full-service average.
The desert summer swing
EIA's monthly sample includes IID. Across September 2025 to August 2026, monthly use per home swung between 593 kWh in February 2026 and 2,127 kWh in August 2026, with average bills of $143.00 and $345.39 in those months. SCE's highest month averaged 1,159 kWh per home, and SDG&E's 588 kWh2.
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.
Show the numbers
| Month | kWh per customer | Bill per customer | ¢/kWh |
|---|---|---|---|
| September 2025 | 1,682 | $275.99 | 16.40¢ |
| October 2025 | 1,109 | $184.26 | 16.62¢ |
| November 2025 | 795 | $166.94 | 21.01¢ |
| December 2025 | 614 | $131.41 | 21.39¢ |
| January 2026 | 636 | $152.41 | 23.97¢ |
| February 2026 | 593 | $143.00 | 24.12¢ |
| March 2026 | 781 | $184.84 | 23.67¢ |
| April 2026 | 996 | $232.70 | 23.37¢ |
| May 2026 | 1,011 | $236.00 | 23.34¢ |
| June 2026 | 1,401 | $322.64 | 23.04¢ |
| July 2026 | 1,850 | $370.32 | 20.02¢ |
| August 2026 | 2,127 | $345.39 | 16.24¢ |
Bills swing less than use because the fixed monthly charge weighs less per kWh in high-use months. Across the 12 months, an IID home used 1,134 kWh a month on average and paid $229.062.
The 2025 rate update and what EIA's data show
IID's prices are set by its own board, not by the California Public Utilities Commission. The American Public Power Association reported that IID's board approved a rate update on January 21, 2025, the district's first rate adjustment since 2015, citing reliability work and higher fuel and power procurement costs. In March 2025, according to the same association, IID eliminated its Energy Cost Adjustment charge and returned the excess funds to customers as a reduction on June-to-September 2025 bills. IID's rate update page lists the scheduled changes through 2028.
In EIA's annual data, the residential average rose 4.4%, from 17.91¢ per kWh in 2024 to 18.69¢ per kWh in 2025. The average bill changed by −2.5%, from $207.56 to $202.30, because use per home dropped from 1,159 kWh3 to 1,083 kWh1 a month. The 12-month average for September 2025 to August 2026 was 20.20¢ per kWh2, above the 2025 figure. The August 20264 reading is compared with the same month of 2025; bills for June to September 2025 carried the summer reduction. Monthly figures for 2026 are preliminary.
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).
Show the numbers
| Month | Imperial Irrigation District (¢/kWh) | kWh per customer | Bill per customer |
|---|---|---|---|
| January 2025 | 22.25¢ | 659 | $146.63 |
| February 2025 | 21.39¢ | 608 | $130.13 |
| March 2025 | 21.49¢ | 567 | $121.76 |
| April 2025 | 21.04¢ | 781 | $164.35 |
| May 2025 | 20.81¢ | 943 | $196.29 |
| June 2025 | 20.44¢ | 1,456 | $297.48 |
| July 2025 | 16.01¢ | 1,846 | $295.58 |
| August 2025 | 16.29¢ | 1,843 | $300.23 |
| September 2025 | 16.40¢ | 1,682 | $275.99 |
| October 2025 | 16.62¢ | 1,109 | $184.26 |
| November 2025 | 21.01¢ | 795 | $166.94 |
| December 2025 | 21.39¢ | 614 | $131.41 |
| January 2026 | 23.97¢ | 636 | $152.41 |
| February 2026 | 24.12¢ | 593 | $143.00 |
| March 2026 | 23.67¢ | 781 | $184.84 |
| April 2026 | 23.37¢ | 996 | $232.70 |
| May 2026 | 23.34¢ | 1,011 | $236.00 |
| June 2026 | 23.04¢ | 1,401 | $322.64 |
| July 2026 | 20.02¢ | 1,850 | $370.32 |
| August 2026 | 16.24¢ | 2,127 | $345.39 |
Three counties, shared with other utilities
EIA's service-territory records place IID in three counties: Imperial, Riverside and San Diego. In all three, at least one other utility also reports customers, so a county, city or ZIP code does not settle which utility serves a home. IID's own service-area map decides by address.
Source: EIA-861 2025, service territory; Census Bureau, Cartographic boundary file, counties. EIA-861 2025 service territory: 3 counties. Counts whole counties even where the utility serves only part of one; check the utility's own service-area map for an address.
Show the numbers
| County | Other utilities reporting service |
|---|---|
| Imperial County | Southern California Edison, WAPA-- Western Area Power Administration |
| Riverside County | Southern California Edison, Riverside Public Utilities, City of Banning, City of Moreno Valley, Anza Electric Cooperative, City of Corona, WAPA-- Western Area Power Administration |
| San Diego County | PG&E, Southern California Edison, SDG&E, City of Escondido |
Smart meters, rooftop solar and outages
Advanced (AMI) meters made up 100.0% of IID's residential meters in 2025. IID reported 11,728 net-metered residential solar installations with 89.6 megawatts of capacity, or 82.1 per 1,000 residential customers, against 156.0 per 1,000 across California and 158.78 at SCE. Electricity that panels produce and use on site is not in EIA's kWh per home, which counts only what IID sells.
IID customers averaged 114 minutes without power in 2025 including major events, fewer than the California average of 345 minutes, and 56 minutes excluding them, with 0.72 interruptions per customer (IEEE 1366). SCE's customers averaged 545 minutes in 2025 and SDG&E's 130 minutes9.
Business customers and help with bills
IID's 22,074 commercial customers paid an average of 18.24¢ per kWh in 2025, close to the residential figure, with an average monthly bill of $1,010.43. Its 807 industrial customers paid 18.59¢ per kWh. Across all 165,797 accounts the average was 18.49¢ per kWh1.
Households that struggle with summer bills can apply for federal LIHEAP aid, which brought California $242.1 million10 in fiscal year 2026. For statewide prices and the other utilities, see electricity in California.
IID electricity: common questions
What is IID's electric rate per kWh?
IID's residential customers paid an average of 18.69¢ per kWh1 in 2025 and 20.20¢ per kWh2 over the last 12 months (September 2025 to August 2026, EIA-861M, 2026 months preliminary). Both are total residential revenue divided by kWh sold, so they blend the monthly customer charge, the energy charge and any credits; IID's published rate schedules list the separate charges.
What is the average IID electric bill?
$202.30 a month in 2025, for 1,083 kWh1 of use. Over the last 12 months (September 2025 to August 2026) the average was $229.06, from $131.41 in December 2025 to $370.32 in July 20262 (preliminary).
Did IID raise electric rates?
Yes. IID's board approved a rate update on January 21, 2025, its first rate adjustment since 2015, with changes phased in through 2028. EIA's residential average rose 4.4%1 from 2024 to 2025, and the 12-month average for September 2025 to August 2026 was 20.20¢ per kWh2.
Is IID cheaper than SCE or SDG&E?
Per kWh, yes: in 2025 IID's residential customers paid 18.69¢ per kWh on average, SCE's full-service customers 31.48¢ per kWh and SDG&E's 45.77¢ per kWh. Per month, no: IID homes used far more electricity, so the average IID bill ($202.30) was above SCE's ($149.07) and SDG&E's ($167.871). The address, not the customer, decides which utility serves a home.
Related pages
Sources
- EIA-861 annual electric power industry report, 2025 final; table Sales_Ult_Cust_2025; 2025, final; released October 7, 2026. www.eia.gov
- EIA-861M monthly sales and revenue by utility; table sales_ult_cust_2025 and _2026; released October 23, 2026. www.eia.gov
- EIA-861 annual electric power industry report, 2024 final; table Sales_Ult_Cust_2024; 2024, final (file updated December 3, 2025); released December 3, 2025. www.eia.gov
- EIA, Electric Power Monthly / EIA-861M sales and revenue by state; table sales_revenue.xlsx (EPM Table 5.6.A); January 2001 to 2026-08; months since January 2026 preliminary; released October 23, 2026. www.eia.gov
- EIA-861 2025, average monthly bill by state; table Average_Bill_2025; 2025, final; released October 7, 2026. www.eia.gov
- EIA-861 2025, service territory; table Service_Territory_2025; 2025, final; released October 7, 2026. www.eia.gov
- Census Bureau, Cartographic boundary file, counties; table cb_2025_us_county_5m; cb_2021_us_county_5m; 2025 (2021 for Connecticut). www.census.gov
- EIA-861 2025, advanced meters, dynamic pricing and net metering; table Advanced_Meters, Dynamic_Pricing, Net_Metering 2025; 2025, final; released October 7, 2026. www.eia.gov
- EIA-861 2025, reliability; table Reliability_2025; 2025, final; released October 7, 2026. www.eia.gov
- HHS, LIHEAP funding releases to states; table FY2027 first release; FY2026 final; FY2027 first release (October 9, 2026); FY2026 total; released October 9, 2026. acf.gov
How every figure is built: methodology. Found an error? Write to [email protected]; corrections are listed on the updates page.