Imperial Irrigation District Rate Selection Guide
Imperial Irrigation District (IID) is California's third-largest public power utility, serving roughly 165,000 electric customers across the Imperial and Coachella valleys. As a publicly owned utility, IID is not subject to CPUC Green Button mandates, so programmatic data access is limited and largely manual.
Imperial Irrigation District Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| GS - General Service | commercial | Bundled energy + service charge + ECA (see tariff) | Small to medium commercial loads |
| GL - Large General Service | industrial | Energy + demand + service charge + ECA (see tariff) | Large C&I with significant demand |
| TOU-GL - Time-of-Use Large General Service | industrial | TOU energy + demand + ECA (eff 01-01-26) | Large C&I that can shift load off-peak |
| A-2 - General Wholesale Power Service | industrial | Energy + demand (see tariff) | Very large/wholesale power service |
Market Overview
IID is a vertically integrated, publicly owned utility governed by a locally elected Board of Directors. It is the sole electric provider in its territory; there is no competitive retail supplier choice or community choice aggregation. Rates are set by the Board, not the CPUC.
Need to pull your actual usage data to compare rates? See the Imperial Irrigation District Data Access Guide →
Current Rate Schedules
IID publishes all electric rate schedules and regulations on its rates page; commercial and industrial rates are set by Board action and updated periodically (most current C&I schedules carry a 01-01-26 effective date per the IID rate schedule index). Specific energy and demand charges are detailed in each schedule's tariff sheet; figures below describe structure and applicability rather than quoting per-kWh prices, which should be read from the live tariff sheets.
Effective: January 1, 2026 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Schedule GS - General Service | commercial | Small and medium commercial customers. | Bundled energy charge with monthly service charge; energy cost adjustment (ECA) applies. See tariff sheet for current rates. | — |
| Schedule GL - Large General Service | industrial | Large commercial and industrial customers above the GS threshold. | Bundled energy charge plus demand charge and monthly service charge; ECA applies. See tariff sheet for current rates. | — |
| Schedule TOU-GS - Time-of-Use General Service | commercial | General service customers electing time-of-use pricing. | Time-differentiated energy charges (on/off-peak) with service charge and ECA. Effective 01-01-26. | — |
| Schedule TOU-GL - Time-of-Use Large General Service | industrial | Large general service C&I customers electing time-of-use pricing. | Time-differentiated energy charges plus demand charge, service charge, and ECA. Effective 01-01-26. | — |
| Schedule A-2 - General Wholesale Power Service | industrial | Very large/wholesale power service customers. | Energy and demand charges for high-volume/wholesale service; ECA applies. See tariff sheet. | — |
| Schedule AG - Agricultural General Service | agricultural | Agricultural customers. | Energy charge with service charge; agricultural pumping (Schedule PA) available for pumping loads. See tariff sheet. | — |
Rate Recommendations by Use Case
Large industrial / high-demand facility
Demand-driven facilities should focus on Schedule GL or A-2 and aggressively manage billed demand.
Demand charges dominate the bill on these schedules; small kW reductions yield outsized savings.
- Request AMI interval data to identify coincident peaks
- Stagger equipment startups
- Evaluate on-site generation/storage for peak shaving
Commercial customer with flexible load
Commercial sites that can shift usage should compare standard GS against TOU-GS/TOU-GL.
Off-peak energy pricing rewards load shifting; the benefit depends on the on/off-peak spread.
- Map your load shape before electing TOU
- Shift HVAC pre-cooling and process loads off-peak
- Re-evaluate annually as schedules update
Energy consultant / aggregator managing IID accounts
Plan for manual data workflows since IID has no Green Button or API.
No automated data sharing exists; written authorization and manual requests are required for each account.
- Collect signed customer authorizations up front
- Request 24 months of bills plus interval data via customerservice@iid.com
- Budget 10-20 business days per interval request
Agricultural operation
Ag customers should compare AG general service with agricultural pumping (PA) for pumping-heavy loads.
Pumping loads may be more economical under PA depending on usage patterns.
- Separate pumping load analysis
- Consider TOU for irrigation scheduling
- Review ECA impact on volumetric charges
Historical Rate Trends
IID rates are adjusted by Board action and through the Energy Cost Adjustment (ECA), which tracks fuel and purchased-power costs. The most recent C&I rate schedules carry a 01-01-26 effective date per the rate schedule index, and TOU-GS was reflected with a mid-2025 update.
January 1, 2026
Most current C&I schedules (GS, GL, TOU-GS, TOU-GL, A-2, AG) reflect a 01-01-26 effective date per the IID rate schedule index.
see tariffJune 1, 2025
TOU-GS Time-of-Use General Service update reflected in 2025.
see tariffOverall trend: Periodic adjustments tied to cost of service and ECA; no retail-choice market pricing.
Next expected change: Future adjustments set by Board action; monitor the IID Rate Update page.
Cost Optimization Strategies
For C&I customers, the biggest levers are demand management, load shifting onto TOU schedules, and verifying the most economical schedule for the load profile. Because interval data is not self-service, obtaining AMI interval data via request is often the first step to optimize.
Optimize peak demand on GL/A-2
For: Large general service and wholesale C&I
Stagger large equipment startups and manage coincident peaks to reduce billed demand on demand-based schedules.
Shift load to off-peak with TOU-GS/TOU-GL
For: C&I able to time-shift load
Move flexible processes to off-peak periods to capture lower TOU energy prices.
Request and analyze AMI interval data
For: All C&I
Obtain interval data via customer service to baseline load shape before selecting a schedule or DR program.
Participate in Shift & Save demand response
For: C&I with curtailable load
Reduce load during called events for incentives.
To implement these strategies, you need your 15-minute interval data. Learn how to download Imperial Irrigation District interval data →
Frequently Asked Questions
Can a C&I customer get interval (15-minute) data from IID?▾
Not through self-service. IID's AMI collects interval data, but there is no portal download. A commercial or industrial customer must request it by phone (1-800-303-7756) or email (customerservice@iid.com), specifying account, date range, granularity, and format. Expect 10-20 business days and possible fees.
Does IID support Green Button or a Share My Data API for consultants?▾
No. As a publicly owned utility, IID is exempt from the CPUC Green Button mandate and offers neither Download My Data, Connect My Data, nor an ESPI/aggregator API. Third-party access to a C&I account is manual and requires signed written customer authorization.
How does an energy manager authorize a third party to access IID data?▾
Have the customer sign a written authorization specifying account number, data scope, date range, third-party contact, and an expiration date. Submit it with the data request to customerservice@iid.com. IID typically delivers data to the customer or, with authorization, to the third party.
What rate schedules apply to commercial and industrial accounts?▾
IID's C&I schedules include GS (General Service), GL (Large General Service), and the optional time-of-use schedules TOU-GS and TOU-GL, plus A-2 (General Wholesale Power Service) and agricultural schedules (AG, PA). Current rate sheets are published on the IID rates page and updated by Board action.
How far back does IID billing history go online?▾
IID Customer Connect provides up to 24 months of billing history, downloadable as PDF. There is no bulk CSV/XML export through the portal.
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