Phoenix Homeowners: Your Powerwall Can Do More
Arizona utilities are raising rates fast. Grid Getter's DemandGuard watches your demand every minute and manages your Powerwall discharge strategy so you stop overpaying on APS and SRP demand charges.
Without DemandGuard
With DemandGuard
*Based on SRP's Customer Generation Plan E-27 for summer peak effective Nov 2025. Shown for example only.
Phoenix Energy Bills Are Out of Control
APS and SRP rate hikes are hitting Phoenix homeowners hard.
Summer Bills Hit $200-$450/mo
Phoenix summers mean running your AC around the clock. With on-peak demand charges stacking on top of usage charges, monthly bills between $200 and $450 are common for homeowners with standard rate plans.
20% Rate Increase Since 2021
APS and SRP have raised residential rates over 20% since 2021, and more increases are on the way. Your Powerwall should be working harder to offset those rising costs, not sitting idle during peak hours.
Solar Alone Isn't Enough
Phoenix gets plenty of sun, but solar production drops off right when on-peak hours begin in the late afternoon. Without smart battery management, you're still pulling expensive peak power from the grid when it matters most.
How Demand Charges Work in Phoenix
Understanding the billing mechanic that's inflating your bill
30 or 60-Minute Demand Intervals
APS and SRP measure your highest average power draw (kW) across 30 or 60-minute intervals, depending on your rate plan. One spike from your AC compressor kicking on, your EV charger, or your pool pump can set your demand charge for the entire month.
On-Peak Hours Are Expensive
Demand charges are calculated during on-peak windows, typically 2-8 PM on weekdays when Phoenix temperatures peak. Every kW of demand during these hours costs you significantly more than off-peak usage.
SRP 2029 Deadline
SRP is transitioning residential customers to demand-based rate plans by 2029. If you're not already on a demand plan, you will be. Getting ahead of this now means lower bills when the switch happens.
Grid Getter's DemandGuard: Built for Phoenix
Smart Powerwall management that watches every minute so you don't have to.
Set Your Demand Target
Choose the maximum grid power (kW) you want to draw during on-peak hours. DemandGuard enforces that limit automatically, keeping your demand charges predictable month after month.
Minute-by-Minute Monitoring
DemandGuard watches your real-time power usage every minute during peak hours. It knows exactly when your utility's billing interval starts and ends — 30 or 60 minutes depending on your rate plan — and adjusts your Powerwall accordingly.
Smart Discharge Strategy
Instead of draining your Powerwall all at once, DemandGuard alternates between battery and grid power across each interval. This keeps demand low while preserving battery for when you need it most.
Predictable Monthly Bills
No more bill shock from a single hot afternoon. By enforcing your demand limit during every peak interval, your charges stay consistent and budgetable.
Fully Automatic
Set it once and forget it. DemandGuard runs continuously during on-peak hours with zero manual input. Override anytime if you need to through the Grid Getter app.
Works With APS & SRP
DemandGuard is configured for Arizona utility billing intervals and peak schedules. It works with your existing Tesla Powerwall. No additional hardware needed.
What Phoenix Homeowners Get
Real results for Arizona energy bills
Ready to Take Control of Your Energy Bills?
Phoenix homeowners are saving with DemandGuard. Connect your Powerwall in under 5 minutes and start managing your demand charges today.
Get StartedNo additional hardware needed. Works with your existing Tesla Powerwall.