Dive Brief:

• Tesla is teasing a big, April 30 announcement that is widely believed to involve the unveiling of a battery large enough to power a home.

• Billionaire Elon Musk, Tesla’s CEO and product architect, has hinted that his electric car company has created a battery that could keep a home or another building running during a power outage and lessen its dependence on the electricity grid.

• Details have leaked about a battery that homeowners can charge overnight with electric company juice, and then use to power their houses the next day with little or no help from the utility. The new battery is rumored to include a way to store power generated by solar panels and wind turbines.

Dive Insight:

Musk, also the chairman of SolarCity, which installs photovoltaic panels on residential rooftops, has already said those panels will come with battery storage within a decade.

SolarCity already has installed some Tesla batteries on commercial buildings like Walmart stores to help them lower their reliance on utility-supplied electricity during hours of peak, daytime demand when rates are at their highest. SolarCity is testing the batteries on 500 California Homes.

As Utility Dive reported, the home battery will also have a least option for customers for a $1500 initial payment, and $15 monthly payments for the following 10 years.