Electric utilities across the country are transitioning millions of residential customers from flat-rate billing to Time-of-Use (TOU) rate plans. Under a flat rate, every kilowatt-hour (kWh) costs the exact same whether you brew coffee at 7 AM or run laundry at midnight.
Under Time-of-Use pricing, electricity costs fluctuate dramatically throughout the day based on grid demand. During high-demand "On-Peak" hours (typically 4 PM to 9 PM on summer weekdays), rates can surge to $0.45-$0.65/kWh. During "Off-Peak" or "Super Off-Peak" periods (late night and midday solar hours), electricity may drop as low as $0.10-$0.15/kWh.
Calculate your potential savings from shifting usage: thetoolss.com/tool/electricity-peak-vs-off-peak-calculator
Understanding Peak vs Off-Peak Rate Tiers
- On-Peak Hours (Highest Cost): 4:00 PM – 9:00 PM on weekdays. People return home from work, turn on air conditioning, cook dinner, and watch television. Grid operators must fire up expensive peaker gas plants.
- Off-Peak Hours (Moderate Cost): 6:00 AM – 4:00 PM and 9:00 PM – 11:00 PM. Balanced grid operations.
- Super Off-Peak Hours (Cheapest Cost): Midnight – 6:00 AM, and spring weekends with abundant solar/wind generation.
The 5 Most Effective Appliance Shifting Strategies
- Schedule EV Charging Overnight: An electric car battery consumes 40-75 kWh per full charge. Charging at peak rates ($0.45/kWh) costs $31.50 per session; scheduling the charge for 2 AM ($0.12/kWh) cuts that cost to just $8.40!
Compare EV charging costs: thetoolss.com/tool/ev-charging-cost-calculator
- Pre-Cool Your Home with Air Conditioning: Run your AC during early afternoon off-peak hours to drop home temperatures to 70°F, then set the thermostat to 78°F between 4 PM and 9 PM during peak rates.
Calculate AC electricity consumption: thetoolss.com/tool/ac-electricity-cost-calculator
- Run Dishwashers and Washing Machines on Delay Timers: Most modern appliances feature a 4-to-8 hour delay start button. Load dishes after dinner, but delay start until 11:30 PM.
- Manage High-Wattage Space Heaters in Winter: Portable space heaters draw 1,500 Watts continuously.
Check space heater running costs: thetoolss.com/tool/space-heater-cost-calculator
- Pair with Solar and Battery Storage: A home solar system generates peak power when the sun is brightest. Adding a home battery lets you store excess solar energy to power your home during expensive evening peak hours.
Calculate solar panel payback and ROI: thetoolss.com/tool/home-solar-payback-calculator