The claim that energy usage peaks after sunset comes from the diagram[0] in the OP's link[1]. In the diagram, you can see that solar power peaked at around 3pm

The claim that energy usage peaks after sunset comes from the diagram[0] in the OP's link[1]. In the diagram, you can see that solar power peaked at around 3pm on the graphed day, then declined to near-zero by 6pm. Meanwhile, the total load rose steadily throughout the day, peaking at about 9pm before declining. [0] - https://en.wikipedia.org/wiki/File:Duck_Curve_CA-ISO_2016-10-22.agr.png https://en.wikipedia.org/wiki/File:Duck_Curve_CA-ISO_2016-10... [1] - https://en.wikipedia.org/wiki/Duck_curve https://en.wikipedia.org/wiki/Duck_curve