Indeed, it’s mainly for storing solar electricity. Grid scale power generation and storage are more efficient and effective. Yet the consumer solar and battery market is booming. There’s lots of factors at play. People already own their roofs. They pay a premium on using grid power vs commercial users. It’s an easy and relatively safe way to invest your own money, etc… And then the batteries follow the solar panels. If grid operators would manage their own batteries and pay us properly for the energy we put into the net, then privately owning a battery would not make sense.