SRP Legacy Plan Migration Calculator
SRP is phasing out E-13, E-21, E-22, E-23, E-24, and E-26 by approximately November 2029. This calculator estimates how your monthly bill will change when you're forced onto a current plan — and what you can do now to soften the hit.
Your Current SRP Plan
Check your monthly SRP bill (top right) or My Account on srpnet.com. Plans retiring by ~November 2029 are marked.
Retiring by 2029
Current (no migration needed)
Your Usage Profile
How much of your electricity use falls during SRP's on-peak window (2-8pm weekdays)? This drives the migration impact.
Monthly Electricity Usage (kWh)
Typical Arizona home runs 900-1,500 kWh/month. Summer months with AC can hit 1,800-2,500+ kWh. Check your SRP bill for the exact number.
Estimated Migration Impact
What your monthly SRP bill may look like when migrated to E-27 TOU (current). Illustrative only — actual bills vary with monthly adjustments.
Current bill (est)
$182
Your plan today
New bill on E-27
$203
After migration
Monthly change
+$21
+12% vs today
Bill Breakdown on E-27 TOU (current)
Annual delta: +$252/year
Mitigation strategies
- →Shift high-draw loads (dishwasher, laundry, pool pump, EV charging) out of the 2-8pm window — this alone can cut the increase by 30-50%.
- →Your 6 kW peak demand drives a $87/mo demand charge. A battery that shaves peak to 4 kW cuts that by ~$29/mo.
- →Pre-cool your home to 73°F by 2pm, then let it drift to 78°F during the peak window. Typical savings: $50-$100/mo in summer.
Why This Migration Matters
Legacy SRP plans like E-13 and E-21 charge one flat rate all day. Current plans like E-27 charge 3x more during the 2-8pm peak window plus a demand charge of $14.50/kW in summer. For customers who haven't built load-shifting habits, this transition can add 20-40% to a monthly bill.
6-Hour Peak Window
SRP on-peak runs 2-8pm weekdays year-round. Twice as long as APS's 3-hour peak window. Load shifting is harder but the savings are bigger.
Demand Charges
Current SRP plans add a demand charge of $14.50/kW in summer, based on your single highest peak-hour draw. One hot afternoon can set your demand charge for the whole month.
Battery Leverage
On SRP, every kW a battery shaves off your peak demand saves $14.50/month. Plus energy arbitrage. Batteries pay back faster on SRP than APS.
Keep Reading
Rates
Full SRP Legacy Plan Retirement Guide
Which plans retire, when, what you'll be moved to, and the 4 strategies to protect your bill before 2029.
Rates
SRP TOU Rates 2026 Guide
Complete breakdown of E-27, demand charges, and Customer Generation Plan for solar owners.
Calculator
AZ Pre-Cooling Savings Calculator
Pre-cooling before the 2-8pm peak is the #1 free mitigation for migration impact.
Calculator
Powerwall Payback Calculator
Battery storage pays back faster on SRP thanks to demand charge shaving. See your exact payback.
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Disclaimer
Rate estimates based on SRP's 2026 residential rate schedule. Actual bills vary with monthly Electric Adjustment Mechanism charges, seasonal rates (summer rates May-October are higher than winter), and exact hourly usage patterns. SRP sets individual migration timing; some customers may be moved earlier than November 2029. Always verify your current plan and target plan directly with SRP before making major equipment or rate-related decisions. This is not financial or professional advice.