Salt River Project Agricultural Improvement and Power District Rate Selection Guide
Salt River Project (SRP) is one of the largest public power utilities in the United States, serving more than 1.1 million electric customers across the greater Phoenix metro. For commercial and industrial energy teams, SRP offers self-service usage and demand data through its My Account and SPATIA business portals, plus an unofficial JSON API used by aggregators — though it does not yet support Green Button or EDI for customer data. As a community-governed political subdivision with an elected board, SRP sets its own rates and Arizona has no retail electric choice in its territory.
Salt River Project Agricultural Improvement and Power District Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| E-36 General Service | Commercial | Svc $15.16/mo; demand $4.37-$7.13/kW; energy ~$0.076-$0.14/kWh | Most commercial and small-industrial sites without a strong daily load pattern |
| E-32 TOU General Service | Commercial | Svc $15.16/mo; demand $1.26-$6.99/kW; energy ~$0.06-$0.19/kWh by period | Commercial customers who can shift load away from the 5-10 p.m. on-peak window |
| E-65 Substation LGS | Industrial | Svc $5,767.02/mo + Facilities Rider; demand $2.85-$16.84/kW; energy ~$0.056-$0.153/kWh | Large industrial loads served at a dedicated substation transformer |
Market Overview
SRP operates as a self-regulated public power district. Rates are approved by its elected Board of Directors via a public pricing process, not a state utility commission. Retail competition (direct access) is currently inactive in Arizona, so SRP customers cannot shop for a competitive electric supplier.
Need to pull your actual usage data to compare rates? See the Salt River Project Agricultural Improvement and Power District Data Access Guide →
Current Rate Schedules
SRP's commercial and industrial price plans combine a fixed monthly service charge, per-kW demand charges (applied to kW over 5 kW on general service plans), and per-kWh energy charges that vary by season (Summer, Summer Peak, Winter) and, on TOU plans, by time of day. All existing plans took a base rate increase effective with the November 2025 billing cycle (General Service +2.7% base / +1.3% net after a 1.4% FPPAM decrease; Large General Service +4.4% base / +1.3% net after a 3.1% FPPAM decrease). The figures below are from SRP's published November 2025 rate books and exclude separately billed adjustments.
Effective: November 1, 2025 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| E-36 General Service | commercial | Commercial, business, professional, small industrial, and recreational facilities served through one meter; the default plan where no other standard plan applies. | Monthly service charge plus seasonal per-kW demand charges (on kW over 5 kW) and tiered, seasonal per-kWh energy charges. Billing demand is the maximum 15-minute integrated kW in the cycle. | Monthly service charge $15.16; energy roughly $0.076-$0.14/kWh depending on season and tier (e.g., Summer first 350 kWh $0.1187/kWh, all additional $0.0772/kWh)+ Per kW over 5 kW: Summer $4.73, Summer Peak $7.13, Winter $4.37 |
| E-32 Time-of-Use General Service | commercial | Commercial, business, professional, small industrial, and recreational facilities that can be metered by time of day and want a TOU rate. | Monthly service charge plus seasonal/time-of-day per-kW demand charges (on kW over 5 kW) and on-peak/shoulder/off-peak per-kWh energy charges. On-peak is 5-10 p.m. weekdays; off-peak 8 a.m.-3 p.m. daily. Billing demand is the max 30-minute integrated kW. | Monthly service charge $15.16; energy from about $0.06/kWh off-peak to $0.19/kWh summer-peak on-peak (e.g., Summer Peak on-peak $0.1924/kWh, off-peak $0.1093/kWh)+ Per kW over 5 kW (summer on-peak): Summer $5.29, Summer Peak $6.99, Winter $4.69; max-of-shoulder/off-peak $1.26 |
| E-65 Substation Large General Service | industrial | Large customers metered at the low side of a dedicated or customer-owned substation transformer; usage measurable by time of day. Three-phase service. | Large fixed monthly service charge plus a customer-specific Facilities Charge, seasonal per-kW on-peak demand charges, and seasonal/time-of-day per-kWh energy charges. Billing demand is the max 30-minute integrated on-peak kW. | Monthly service charge $5,767.02 (with one meter) plus Facilities Rider; energy roughly $0.056-$0.153/kWh by season and period (e.g., Summer Peak on-peak $0.1529/kWh, off-peak $0.0663/kWh)+ Per on-peak max kW: Summer $6.76, Summer Peak $16.84, Winter $2.85 |
Rate Recommendations by Use Case
Mid-size commercial building
Office, retail, or light-industrial site on standard general service.
E-36 is SRP's default commercial plan and works well for sites with a flat or unpredictable daily profile that cannot reliably shift load off the evening peak.
- Track the maximum 15-minute demand to understand your billed kW
- Watch the July-August Summer Peak when demand charges nearly double
- Pull hourly usage from My Account or SPATIA to find demand spikes
Load-flexible commercial operation
Business that can move discretionary load away from the 5-10 p.m. weekday peak.
E-32's on-peak/off-peak spread rewards shifting consumption to off-peak (8 a.m.-3 p.m.) and shoulder hours, where energy can be roughly half the summer-peak on-peak price.
- Automate HVAC pre-cooling and equipment scheduling around the 5-10 p.m. window
- Use SPATIA 15-30 minute interval data to verify load shifting
- Consider battery storage to flatten the evening peak
Large industrial / substation-served load
Manufacturing or large facility served at a dedicated substation transformer.
E-65 trades a high fixed service and Facilities charge for lower per-unit energy, which favors high-load-factor industrial operations. Transmission-voltage service (>69 kV) earns a further 20.1% transmission-charge reduction.
- Model the Facilities Rider charge for your specific substation
- Concentrate production in off-peak/shoulder hours to cut on-peak demand
- Loads of 1 MW+ may qualify for the Full Electric Service Requirements Rider
Multi-site portfolio data automation
Energy or sustainability team aggregating SRP usage across many accounts.
SRP has no official API or Green Button, so portfolio teams should rely on SPATIA, the Strategic Energy Manager, or Nectar's API (docs.nectarclimate.com) for standardized interval data — and may qualify for the aggregation discount.
- Use Nectar's API (docs.nectarclimate.com) or the srpenergy client for programmatic interval data
- Set up third-party authorizations early (5-10 business days)
- Pursue the $0.0003/kWh aggregation discount above 300,000 kWh/month
Historical Rate Trends
SRP's elected Board sets rates through a periodic public pricing process. The most recent change took effect with the November 2025 billing cycle, raising base rates while lowering the Fuel and Purchased Power Adjustment, for a modest net increase on commercial plans.
November 1, 2025
Approved commercial base rate increases effective the November 2025 billing cycle: General Service +2.7% base and Large General Service +4.4% base, partially offset by FPPAM decreases (-1.4% GS, -3.1% LGS) for a net +1.3% on both. The E-33 plan was frozen to new customers and will retire by November 2029.
+1.3%Overall trend: Gradual net increases. The November 2025 cycle produced a net 1.3% increase for both General Service and Large General Service plans (General Service: +2.7% base offset by a 1.4% FPPAM decrease; Large General Service: +4.4% base offset by a 3.1% FPPAM decrease). Monthly commercial service charges were unchanged.
Next expected change: Set through SRP's next public pricing process; no specific date announced as of June 2026.
Cost Optimization Strategies
Because SRP C&I bills are driven by demand (kW) and seasonal/time-of-day energy, the biggest savings come from shaving peak demand, shifting load off the 5-10 p.m. weekday on-peak window, and choosing the right plan and metering arrangement.
Manage Summer Peak demand
For: All demand-metered C&I plans
Demand charges spike in the July-August Summer Peak season (e.g., E-36 jumps to $7.13/kW; E-65 on-peak to $16.84/kW). Staging equipment, battery storage, and demand-response participation reduce the billed peak kW.
Shift load off the on-peak window (TOU)
For: TOU general service customers (E-32)
On E-32 and other TOU plans, on-peak energy (5-10 p.m. weekdays) can be roughly 2x off-peak. Moving discretionary load to off-peak (8 a.m.-3 p.m.) or shoulder hours lowers energy cost.
Pursue the aggregation discount
For: Large or multi-account C&I customers
Customers receiving all SRP electric services across qualifying plans who meet 300,000 kWh/month for three consecutive months earn a $0.0003/kWh aggregation discount.
Optimize voltage and power factor
For: Larger C&I customers with suitable metering
Primary-voltage metering earns a 1% reduction on per-kW and per-kWh charges, and keeping power factor at/above 85% avoids billing adjustments.
To implement these strategies, you need your 15-minute interval data. Learn how to download Salt River Project Agricultural Improvement and Power District interval data →
Frequently Asked Questions
Does SRP offer an API for commercial energy data?▾
SRP publishes no official, documented API. C&I customers access 15-30 minute interval data through the SPATIA business portal, and developers can use a reverse-engineered My Account JSON endpoint (no SLA). Nectar provides API access to SRP billing and interval data — see docs.nectarclimate.com.
Can a consultant or energy manager pull our SRP data on our behalf?▾
Yes. The customer authorizes a third party either online through My Account or via the mailed Third Party Authorization Form (5-10 business days to process). Once on file, the third party requests data by phone or email — there is no automated API delivery directly from SRP.
How does SRP charge commercial customers for demand?▾
Most C&I plans bill a per-kW demand charge on kW over 5 kW (general service) that varies by season and peaks in the July-August Summer Peak. For example, E-36 demand runs $4.37/kW in winter up to $7.13/kW in Summer Peak; E-65 on-peak demand reaches $16.84/kW in Summer Peak.
Can SRP commercial customers shop for a competitive electric supplier?▾
No. SRP is a self-regulated public power district and Arizona has no active retail electric choice in SRP territory. Rates are set by SRP's elected Board through a public pricing process, and all customers buy bundled electric service from SRP.
When did SRP's commercial rates last change?▾
Effective with the November 2025 billing cycle. General Service base rates rose 2.7% and Large General Service 4.4%, each partially offset by an FPPAM decrease for a net 1.3% increase. Monthly commercial service charges were unchanged.
Does SRP support Green Button?▾
No. SRP does not participate in the Green Button Alliance and offers neither Download My Data nor Connect My Data. Standardized interval data is available programmatically through Nectar — see docs.nectarclimate.com.
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