What Is Electricity Arbitrage?
Electricity arbitrage is the practice of timing your electricity use (or battery charging and discharging) to take advantage of price differences between peak and off-peak periods. On a time-of-use rate plan, electricity might cost 10 cents/kWh at midnight and 35 cents/kWh at 7 PM. Every kWh you shift from evening to overnight saves 25 cents. Do that at scale, and the savings compound quickly.
Arbitrage doesn't require fancy equipment — even simple behavioral changes like running appliances overnight instead of in the evening constitute basic arbitrage. But with smart home technology and battery storage, you can systematically capture most of the available spread with minimal ongoing effort.
The Arbitrage Opportunity by State
The value of electricity arbitrage depends entirely on the peak-to-off-peak price differential in your specific rate plan:
| Utility / Rate Plan | Off-Peak Rate | Peak Rate | Spread |
|---|---|---|---|
| PG&E (CA) EV2-A | ~9¢/kWh | ~48¢/kWh | 39¢/kWh |
| SCE (CA) TOU-D-PRIME | ~9¢/kWh | ~42¢/kWh | 33¢/kWh |
| ConEdison (NY) TOU-SC9 | ~8¢/kWh | ~22¢/kWh | 14¢/kWh |
| Xcel Energy (CO) TOU | ~7¢/kWh | ~17¢/kWh | 10¢/kWh |
| Duke Energy (NC) TOU | ~6¢/kWh | ~14¢/kWh | 8¢/kWh |
| APS (AZ) TOU | ~8¢/kWh | ~23¢/kWh | 15¢/kWh |
| FPL (FL) EV TOU | ~7¢/kWh | ~15¢/kWh | 8¢/kWh |
California has the most valuable arbitrage opportunity in the US — up to 39 cents/kWh spread on some rate plans. The strategies below are most impactful for California customers but apply wherever TOU rates exist.
No-Battery Arbitrage: Behavioral Load Shifting
You don't need a battery to do electricity arbitrage. You just need to shift high-draw activities to off-peak hours:
- EV charging: Program to charge after 9 PM. At a 25 cent spread, charging 40 kWh off-peak saves $10 per charge. Monthly savings for a typical EV driver: $50–$80.
- Laundry: Washer + dryer use 4–6 kWh per load. Shifting one daily load from 6 PM to 11 PM saves $1.00–$2.50/load, or $30–$75/month.
- Dishwasher: Use delay start to run overnight. 1–2 kWh/cycle × 25¢ spread = $0.25–$0.50/cycle savings.
- Pool pump: Program to run overnight rather than afternoon. A 1.5 kW pump running 8 hours saves $2–$3/day at a 25¢ spread = $60–$90/month.
- Pre-cooling: Cool your home to 74°F before 4 PM (cheaper), then let it drift to 78°F during peak hours with AC minimized. This "thermal banking" can shift 5–15 kWh of AC usage daily.
Smart Home Automation Arbitrage
Manual behavior change is unreliable. Automating load shifting with smart home devices captures the savings without ongoing effort:
- Smart EV charger (ChargePoint, Wallbox, JuiceBox): Program once, saves every day. Connects to utility TOU schedule automatically on some models.
- Smart thermostat (Nest, Ecobee): Set a TOU schedule — pre-cool at lower temperatures before peak, relax cooling setpoint during peak. Ecobee explicitly supports TOU schedules.
- Smart water heater controller (Aquanta, EcoNet): Shifts water heater operation to off-peak hours entirely. The tank stores "cheap" thermal energy for use during peak hours.
- Smart pool pump controller: Programs pump to run during off-peak windows automatically.
Battery Arbitrage: The High-Investment, High-Return Approach
A home battery like the Tesla Powerwall 3 (13.5 kWh) can charge from cheap off-peak grid electricity overnight and discharge during expensive peak hours — capturing the full price spread automatically, without any behavioral change, every single day.
Daily arbitrage math with 10 kWh usable discharge and a 25¢ spread:
10 kWh × $0.25 = $2.50/day in savings
Annual: $2.50 × 365 = $912.50/year
Battery cost after 30% tax credit (Powerwall at $14,000): $9,800
Payback: approximately 10–11 years from arbitrage alone. Better if you also capture backup power value and solar self-consumption benefits.
In California with a 39¢ spread:
10 kWh × $0.39 × 365 = $1,423.50/year → payback of 7 years.
Virtual Power Plants: Getting Paid Extra for Your Battery
Several utilities and aggregators now offer programs where home batteries participate in a virtual power plant (VPP) — the utility can dispatch your battery during grid emergency events in exchange for additional bill credits or payments. Programs offered by PG&E, Pacific Gas & Electric, Tesla Energy, and Sunrun can add $200–$600/year in additional compensation for battery owners in some markets.
The Tax Credit Math
All battery storage systems — whether charged by solar or grid power (under current IRS guidance) — qualify for the 30% federal investment tax credit. This meaningfully improves battery arbitrage economics. Check current IRS guidance on the standalone storage tax credit eligibility, as regulations may evolve.
Bottom Line
Electricity arbitrage is real and accessible at every level — from simple behavioral load shifting (free, saves $50–$150/month in high-spread markets) to full battery arbitrage ($10,000+ investment, $900–$1,400/year returns). The opportunity is most valuable in California and other high-rate states with large TOU spreads. Start with behavioral and smart device automation — the payback is near-instant. Consider battery storage if you're in a high-spread market, plan to be in your home for 10+ years, and value outage protection as an additional benefit. Use our electricity cost calculator to quantify the specific value of load shifting at your rate.