This seems to be the most important bit, but Ars skip over it:<p><i>Or, a GMP customer can buy a Powerwall outright for $6,500 and share access with GMP, receiving a $31.76 monthly credit, which a GMP press release says &quot;represents the value of leveraging the battery to help lower peak energy costs.&quot;</i><p>So this utility (which is generally progressive compared with their peers) is acknowledging that people having energy storage in their home is a benefit to the utility, and are even prepared to put a price on that.<p>There&#x27;s a parallel battle going on with rooftop solar, with some utilities paying money for the value they recieve from this which is above the consumer cost of electricity in many cases, and other utilities trying to shut down users by imposing fees to cover the costs they claim they are incurring.