How SRP E-27 Pricing Works in 2026
SRP serves about a million customers across the East Valley — Mesa, Tempe, Scottsdale, Gilbert, Chandler, and parts of north Phoenix. Its most common residential plan, E-27, is fundamentally different from APS Saver Choice Plus in three ways: it charges for energy AND peak demand, the on-peak window is longer (2-8pm weekdays vs 4-7pm on APS), and solar customers now land on the Customer Generation Plan instead of net metering.
The summer on-peak energy rate is about $0.1100/kWh — notably lower than APS's $0.3439/kWh peak rate. That sounds like a win until you add the demand charge: about $14.50/kW of your highest single on-peak hour each month, applied to your whole bill. A typical East Valley home with a central AC hitting 8-10 kW during a summer afternoon pays $131/month in demand charges alone — before any energy charges. That's the SRP math every homeowner should understand before installing solar, adding a pool, or buying an EV.
What Changed in November 2025: SRP Retired Traditional Net Metering
For years, SRP solar customers on legacy plans received a near-retail credit for every kWh they sent back to the grid. That ended in November 2025. All new residential solar customers now move to the Customer Generation Plan (CGP), which has three big changes:
- Export credit dropped to roughly $0.035/kWh. That's about half of APS's $0.076/kWh export rate. Every kWh you push back to the SRP grid earns you $0.035 — but every kWh you buy back later from the grid costs anywhere from $0.07 to $0.11. Exporting is no longer a break-even activity; it's a loss-minimizing one.
- Monthly service charge bumped to about $32/month for CGP customers (vs roughly $20/mo for non-solar E-27). That's a fixed $384/year before you consume a single kWh.
- Demand charges still apply. Going solar doesn't eliminate them. If anything, it shifts your demand peak to later in the day when solar production drops and the AC is still running — which can actually make your demand charge worse without a battery.
For more on why this change happened and what it means for existing solar customers who are grandfathered on legacy plans, see our news post: SRP Retired Net Metering in November 2025 — What Arizona Solar Customers Need to Know.
How This Calculator Works
The calculator takes four inputs and applies the 2026 SRP E-27 rates (plus CGP if you toggle solar):
- Monthly kWh. Pull this from a recent SRP bill. East Valley homes range from roughly 800 kWh/month for a small efficient home in winter to 3,000+ kWh/month for a large home with central AC and a pool during a Phoenix summer. The default of 1,500 kWh/month is a fair midpoint.
- Season. SRP summer rates run May through October. Winter runs November through April. The annual option blends both for a full-year estimate.
- Peak demand (kW). This is the most important input on SRP — and the one most homeowners don't know off the top of their head. Your SRP bill shows this under "maximum demand" or "on-peak demand." It's the single highest 30-minute or 60-minute on-peak kW reading SRP logged during the billing period. A 2,000 sq ft home with a 4-ton AC compressor, pool pump, dryer, and oven running together typically hits 8-12 kW at some point each summer month.
- Usage profile. The share of your monthly kWh that lands in the on-peak window (2-8pm weekdays). SRP's on-peak window is six hours long vs APS's three, so the typical home runs more of its usage through the expensive window. We provide four presets — Typical, Heavy AC, Work From Home, and Evening Focused.
The calculator then multiplies your monthly kWh by each share to get on-peak / off-peak kWh, multiplies each by the corresponding SRP rate, adds the demand charge (kW × $14.50 summer or $10.50 winter), and adds the monthly service charge. If you toggle the solar switch, it subtracts the CGP export credit at $0.035/kWh and uses the higher $32/month CGP service charge.
What Changes Your SRP Bill the Most
For SRP customers, the biggest lever is almost always demand — not energy. The math is simple: a battery that cuts your peak demand from 10 kW to 5 kW saves $73/month in summer demand charges. That's $435 across the six summer months every year, before you count any energy arbitrage. That's why a well-sized home battery on SRP pays back faster than the same battery on APS, even though APS has slightly higher energy rates.
- Shift heavy AC usage before 2pm or after 8pm. Pre-cool the house to 73°F by 1:30pm, then let it coast up to 79°F by 7:30pm. This cuts both your on-peak energy kWh and your peak demand kW.
- Don't run multiple big loads simultaneously during on-peak. The demand charge is based on your single highest hour, so running the dishwasher + dryer + pool pump together at 4pm spikes your whole month's demand charge. Stagger them.
- Run pool pumps off-peak. A 1.5 hp pump pulling 1.1 kW for 6 hours during on-peak adds 1.1 kW to your demand reading. Schedule it 8am-2pm or after 8pm instead.
- Charge EVs after 8pm. A Level 2 charger pulling 7 kW during on-peak is a 7 kW demand spike by itself. Night charging is the right default on SRP.
- For solar: self-consume, don't export. Every self-consumed kWh avoids the $0.07-$0.11 energy rate. Every exported kWh only earns $0.035. That's a 2-3x gap. Right-size your system to match daytime load and consider a battery to soak up whatever excess you do produce.
Where This Calculator Gets the Rates
All rates come from the published 2026 SRP E-27 tariff and the Customer Generation Plan rider. Specifically: on-peak summer $0.1100/kWh, on-peak winter $0.0800/kWh, off-peak summer $0.0700/kWh, off-peak winter $0.0600/kWh, summer demand charge $14.50/kW, winter demand charge $10.50/kW, CGP export credit $0.035/kWh, CGP monthly service charge $32/month. SRP updates rates separately from APS — confirm the current numbers at mysrp.com before making a solar or battery decision.