Time of use optimization is the strategic management of electricity consumption and battery charging to minimize costs under time-varying rate structures. This approach shifts loads to low-cost periods, typically off-peak hours, and stores energy during low-rate windows for use during expensive peak periods. Optimization can reduce electricity bills by 15% to 35% depending on rate structure and system flexibility.
Technical Details
Time of use rates typically define three pricing periods: off-peak (10 PM to 8 AM), partial-peak (8 AM to 4 PM and 9 PM to 10 PM), and peak (4 PM to 9 PM). Residential rates range from $0.12 to $0.18 per kWh off-peak and $0.28 to $0.65 per kWh during peak periods. Battery systems optimize by charging during off-peak hours and discharging during peak periods. Smart controllers and home energy management systems automate this process using forecasted rates and consumption patterns.
Practical Significance
Home battery systems combined with time of use rates generate annual savings of $400 to $800 per kWh of installed capacity. Electric vehicle owners achieve 30% to 40% fuel cost reductions through scheduled off-peak charging. Commercial facilities with flexible loads realize greater savings through comprehensive demand management, reducing peak demand charges by 20% to 50%. Advanced analytics platforms now predict optimal charging windows with 90% accuracy using machine learning algorithms.