a16z backs Base Power in $200M round for home backup batteries

In less than a year, Base Power has grown from a stealthy startup to one of the largest battery fleets in Texas.

Now the company has raised $200 million to fund a rapid expansion, including dozens more megawatt-hours of battery storage and plans for a domestic battery factory.

The Series B round was led by Addition, Andreessen Horowitz, Lightspeed Venture Partners, and Valor Equity Partners. Altimeter, Terrain, Thrive Ventures, and Trust Ventures participated.

Backup batteries are nothing new — Tesla has been selling its Powerwall for…