美国已经在 42 个州都通过了《净电量计量法》 (net metering rules)，即允许光伏发电 系统上网和计量，电费按电表净读数计量，允许电表倒转，光伏上网电量超过用电量
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net metering rules
净计量规则
以上为机器翻译结果，长、整句建议使用 人工翻译 。
However, in districts where there are net metering rules in place, schools could sell excess energy back to the utility and get close to offsetting all of their energy bills.
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