Peak shaving reduces demand during expensive peak hours, while valley filling shifts energy usage to cheaper off-peak hours. Together, these methods significantly cut electricity costs. Whether you're managing a factory's fluctuating load or trying to optimize your home's solar setup. . Among the most effective strategies are peak shaving, valley filling, and energy-saving cost reduction. Types of Energy Storage for Cost Reduction Wall-Mounted Home Batteries (5–10kWh): Store off-peak electricity for. . energy storage is limited by the rated power. As mentioned in previous articles, once the flat-rate pricing is established, it does not fluctuate based on the administrative time-based regulations.