SunPower Corporation has become the latest US solar provider to pilot the deployment of residential storage systems in California by extending the terms of an existing partnership with homebuilding company KB Homes to include storage.

Barclays has voiced the opinion that solar PV-generated energy coupled with storage presents a long term disruptive risk to electric utilities in the US, as it was reported the bank’s investment arm had downgraded the entire electric sector of the US high grade corporate bond market.