Interstate Power and Light (Alliant Energy) Rate Selection Guide
Interstate Power and Light (IPL), an Alliant Energy company, is a regulated electric and natural gas utility serving Iowa. IPL has deployed Sensus FlexNet AMI smart meters territory-wide, exposing hourly interval data and billing history through its My Account portal, but offers no Green Button, public API, or formal Share My Data program for automated third-party access.
Interstate Power and Light (Alliant Energy) Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| Large General Service (447/487) | commercial | $16.68/kW winter, $21.67/kW summer demand; $0.08309 on-peak, $0.03128-$0.04115 off-peak energy (verified, eff. 2024-10-01) | Facilities over 20,000 kWh/month with meaningful demand |
| Non-Residential General Service (600/607) | commercial | Service charge + energy; see tariff book | Smaller commercial loads |
| Time-of-Use Demand (507/707) | industrial | TOU demand + energy; see tariff book | Loads that can shift off peak |
Market Overview
Iowa does not offer retail electric competition for IPL customers. IPL provides bundled generation, transmission, and distribution at rates approved by the Iowa Utilities Commission. C&I customers select among IUC-approved tariff schedules (e.g., Non-Residential General Service, Large General Service) but cannot choose a competitive supplier.
Need to pull your actual usage data to compare rates? See the Interstate Power and Light (Alliant Energy) Data Access Guide →
Current Rate Schedules
IPL's Iowa electric rates were reset under the 2024 IUC rate case (effective Oct 1, 2024). Verified Large General Service charges are shown below; other C&I schedules follow the same regulated demand-plus-energy structure and are detailed in the IPL Iowa electric tariff book. All schedules add riders (Energy Adjustment Clause, Regional Transmission Service, taxes) that adjust periodically.
Effective: October 1, 2024 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Large General Service (Rate 447/487) | commercial | Establishments expecting >20,000 kWh/month for 12 consecutive months. | Verified per tariff effective 2024-10-01: Service charge $3.13518/day (~$95.36/month); Monthly demand charge $16.68/kW winter and $21.67/kW summer (June 1-Aug 31); Energy on-peak $0.08309/kWh, off-peak $0.03128/kWh winter and $0.04115/kWh summer. Billing demand is the highest 15-minute demand in on-peak hours (7 a.m.-8 p.m. CST weekdays). Power-factor and primary-service discounts apply; plus EAC, RTS, and tax riders. | — |
| Non-Residential General Service (Rate 600/607) | commercial | General commercial customers below the Large General Service usage threshold. | Regulated service-charge-plus-energy structure for smaller commercial loads; larger accounts within the class may carry a demand component. Specific per-kWh and per-kW figures are published in the IPL Iowa electric tariff book (cited); not independently verified here. | — |
| Time-of-Use Demand (Rate 507/707) | industrial | Larger C&I customers electing time-differentiated demand and energy pricing. | Time-of-use demand and energy tariff with on-peak/off-peak periods. Exact rates are set in the IPL tariff book (cited); described qualitatively here as TOU demand-plus-energy. | — |
| Net Metering Pilot (Rate NM) | commercial | Customers with qualifying on-site generation (e.g., solar). | Net metering pilot tariff governing interconnection and bill credits for customer generation; terms per the filed pilot tariff. | — |
Rate Recommendations by Use Case
Large industrial / high-load-factor facility
Plants over 20,000 kWh/month should confirm Large General Service (447/487) is the cheapest fit and attack the demand component, which dominates the bill.
Summer demand at $21.67/kW and a 15-minute on-peak billing window make demand control the top lever; primary-service discounts further cut demand charges.
- Track the highest 15-minute on-peak demand in real time
- Evaluate primary-service metering for 4.42-10% demand discounts
- Maintain power factor above 95%
Mid-size commercial business
Businesses near the 20,000 kWh threshold should model both Non-Residential General Service and Large General Service to find the lower total cost.
Crossing into demand-based LGS can help or hurt depending on load shape; the tariff book defines the breakpoints.
- Export 13 months of hourly data from My Account to model both schedules
- Enroll in business Energy Analytics for rate comparison
- Add an energy consultant as a guest user
Multi-site portfolio manager
Sustainability and energy teams managing several Iowa sites should centralize IPL data through guest-user access and Excel exports since no API exists.
IPL has no Green Button or API, so consistent manual export plus Energy Analytics is the reliable path to portfolio data.
- Standardize monthly Excel exports per site
- Use Privacy Center requests for bulk historical pulls
- Watch EAC and RTS riders for bill variability
Historical Rate Trends
IPL's most recent base-rate change came from a 2024 IUC rate case. The original request was reduced through a settlement; the Commission capped class increases and approved a conditional moratorium.
October 1, 2024
IUC approved a settlement reducing the electric base-rate revenue increase to $185 million (ROE 9.65%), with class increases capped at 15% and the Residential class held to about 5.92%. New rates effective Oct 1, 2024.
+5.92% (residential; classes capped 15%)Overall trend: Base rates increased once in late 2024 then held flat under the moratorium; rider components (EAC, RTS) continue to vary.
Next expected change: No base-rate change expected before the moratorium ends in October 2029, absent the ROE triggers; riders adjust periodically.
Cost Optimization Strategies
Because IPL C&I rates are demand-driven and time-differentiated, the highest-leverage savings for commercial and industrial customers come from peak-demand management, power-factor correction, and load shifting away from summer on-peak windows.
Peak demand management
For: Large General Service and TOU customers
Stagger startups and use demand limiting to reduce the highest 15-minute on-peak demand that sets the monthly billing kW.
Power-factor correction
For: Demand-metered C&I
Maintain power factor above 95% to earn demand-charge reductions; correct loads below 85% to avoid penalties.
Summer on-peak load shifting
For: TOU and LGS customers
Move discretionary load out of summer on-peak energy hours (2-7 p.m. CST) and high-demand windows.
Smart Hours demand response
For: Business customers with smart thermostats
Enroll eligible facility thermostats in Smart Hours for seasonal incentives and automated peak relief.
To implement these strategies, you need your 15-minute interval data. Learn how to download Interstate Power and Light (Alliant Energy) interval data →
Frequently Asked Questions
Can a C&I energy consultant pull our IPL interval data programmatically?▾
No. IPL offers no Green Button or API. The practical options are to add the consultant as a view-only guest user in business My Account, or to export hourly/daily usage to Excel and share it. A Privacy Center request with written authorization is available for bulk historical data.
How much interval history can we get and at what granularity?▾
My Account exposes up to 13 months of history at hourly, daily, and monthly granularity for AMI smart-meter accounts. Data updates roughly daily; there is no real-time or sub-hourly feed.
Which rate schedule applies to a large commercial or industrial facility?▾
Facilities expecting more than 20,000 kWh per month for 12 consecutive months qualify for Large General Service (rate codes 447/487), which is a demand-plus-energy time-of-use tariff. Smaller commercial loads take Non-Residential General Service (rate codes 600/607).
Are IPL base rates expected to change soon?▾
A 2024 IUC rate case settlement established a conditional base-rate moratorium through October 2029, so base rates should be stable, but riders such as the Energy Adjustment Clause and Regional Transmission Service Clause continue to adjust periodically.
Does IPL support EDI for usage data?▾
No. IPL uses Transcepta only for supplier and vendor invoicing. There is no customer-facing EDI 867 historical usage exchange in this regulated Iowa territory.
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