Interstate Power and Light Co bill decoder
Interstate Power and Light sells under this tariff at 17.46¢ per kWh all-in, +3.74¢ against the Iowa average of 13.72¢. The $15.50 fixed charge is 9% of the bill.
Interstate Power and Light at 1,000 kWh, line by line
Interstate Power and Light bills $0.5096 a day, 9% of the $174.62 total at 1,000 kWh. Interstate Power and Light charges 18.466¢ in Jun to Aug and 15.06¢ in Sep to May, 23% apart. 1,000 kWh costs $166.10 in the cheapest month, $200.16 in the most expensive.
Interstate Power and Light: what the tariff charges
| Line | Charged | Amount |
|---|---|---|
| Customer charge | $0.5096 per day, about 30.4 days a month | $15.50 |
| Energy, Sep to May | Every kWh | 15.06¢ per kWh |
| Energy, Jun to Aug | Every kWh | 18.466¢ per kWh |
Interstate Power and Light at 500, 1,000 and 2,000 kWh
| kWh | Total | ¢/kWh | Fixed | Energy | IA avg |
|---|---|---|---|---|---|
| 500 | $95.06 | 19.01 | $15.50 | $79.56 | $68.60 |
| 714 (average home) | $129.11 | 18.08 | $15.50 | $113.61 | $97.96 |
| 1,000 | $174.62 | 17.46 | $15.50 | $159.12 | $137.20 |
| 2,000 | $333.73 | 16.69 | $15.50 | $318.23 | $274.40 |
Interstate Power and Light by month at 1,000 kWh
| Month | Total | ¢/kWh |
|---|---|---|
| January | $166.10 | 16.61 |
| February | $166.10 | 16.61 |
| March | $166.10 | 16.61 |
| April | $166.10 | 16.61 |
| May | $166.10 | 16.61 |
| June | $200.16 | 20.02 |
| July | $200.16 | 20.02 |
| August | $200.16 | 20.02 |
| September | $166.10 | 16.61 |
| October | $166.10 | 16.61 |
| November | $166.10 | 16.61 |
| December | $166.10 | 16.61 |
How the Interstate Power and Light total climbs
$55.28 at 250 kWh becomes $492.85 at 3,000 kWh, 8.9 times the bill for 12 times the power.
Interstate Power and Light total in dollars, by kWh
- 55250
- 95500
- 135750
- 1751,000
- 2541,500
- 3342,000
- 4933,000
Check your Interstate Power and Light bill
Interstate Power and Light: tariff against EIA
EIA-861 puts the 2024 home price at 17.90¢ for Interstate Power and Light, across 417,153 home accounts using 714 kWh a month. The tariff gives 18.08¢ ($129.08). The -0.18¢ gap, about -$1.28 a month, is riders, other plans and rate changes.
Other Interstate Power and Light residential plans
1 more Interstate Power and Light plan fit the model; the decoder prices it.
| Plan | Since | Type | 1,000 kWh | Fixed |
|---|---|---|---|---|
| Electric Residential Service Usage Time of Day - 407 | 2025-07-01 | time of use | $173.10 | $15.50 |
Interstate Power and Light: sources and limits
- Tariff: Electric Residential Service Usage - 400, effective 2025-07-01, record 688099521ed11411230c3a2d, updated 2025-07-23; decode_tariffs.csv.
- Tariff sheet cited by the record: https://www.alliantenergy.com/-/media/alliant/documents/accountandbilling/ratesandtariffs/.
- Data: OpenEI URDB, EIA-861, EIA state data.
Interstate Power and Light: taxes, riders and adjustments sit outside these rates.
Keep going
Questions
What is the monthly fixed charge at Interstate Power and Light?
$0.5096 per day ($15.50 a month) however little you use. At 500 kWh the $95.06 total is 16% fixed.
What does Interstate Power and Light charge for 1,000 kWh?
The tariff gives $174.62 (17.46¢ a kWh): energy $159.12, fixed $15.50. Add taxes and riders.
What makes a Interstate Power and Light bill run higher than the tariff?
At 714 kWh the tariff gives 18.08¢ against 17.90¢ in EIA's 2024 average, -0.18¢ apart. Riders, fees and other plans sit in that gap.
Why does the Interstate Power and Light bill change by season?
1,000 kWh costs $166.10 in the cheapest month and $200.16 in the most expensive, $34.06 apart.
Is the Interstate Power and Light tariff on this page current?
It dates from 2025-07-01, 9 months before the April 2026 snapshot. Interstate Power and Light may have filed newer rates since.
What does an average Interstate Power and Light home use?
714 kWh a month in 2024 (EIA-861), which costs $129.08 on this tariff.