Article 1: New seasonal and peak periods are here

Your energy costs are based on how much electricity you use and when you use it. To better reflect energy use patterns and the impact on the electric grid, the California Public Utilities Commission recently approved these changes, effective December 1, 2017.

Seasonal periods

Energy use aligns with two seasonal periods and the winter season now includes the month of May.

Winter: November 1 to May 31 (previously November 1 to April 30)

Summer: June 1 to October 31 (previously May 1 to October 31)

Time of use periods

The year-round On-peak period, when electricity is needed the most and you pay the highest price, is 4 p.m. – 9 p.m.

Shifting energy use to Off-peak or Super off-peak hours can help you save energy and money. Review your pricing plan at to understand how these changes might impact your business.

You’ll receive more information about these changes in the next few weeks. In the meantime, if you have any questions, please call our Business Services team at 1.800.336.7343 or visit


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