, Columnist
A BMW Billionaire Backs Batteries
Storage systems will allow more customers to cut their connection
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Stefan Quandt, the billionaire behind BMW, has quietly put some of his money into a small company that lets customers store electricity they generate from their solar panels in a battery.
Solarwatt and its peers have big ambitions. Sonnenbatterie, a rival staffed by a group of ex-Tesla employees, wants to have more customers than German utility Eon within 10 years. Revenue last year was 15 million euros, double that the previous year, but still somewhat short of Eon's 112 billion euros.