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In page Tesla Powerwall:

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Another possible savings comes from areas with time-of-use (TOU) pricing. For example, northern California's Pacific Gas and Electric Company charged as low as 12 cents/kWh in 2021 during the off-peak hours (12a–3p) and as high as 52 cents/kWh during the peak hours (4p–9p). When configured for cost savings, the Powerwall can allow a home to go off-grid during peak hours, avoiding the highest cost power usage.[citation needed]