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Utilities buy most of their power at wholesale rates, which are lower than the consumer rate they charge the end user. Net metering rules in some jurisdictions obligate the utilities to buy solar/battery power from users at consumer rates. That can be a good financial opportunity for homeowners and it’s driven a lot of the investment in home solar setups. But local policies can change. The rules are changing in California and it’s not going to be such a good deal anymore in the future.