Tesla Motors says its ambitious plan to produce battery packs strong enough to power houses will be reality within six months. The promise comes as the company revealed lower-than-expected sales figures for Model S vehicles.

“We are going to unveil the Tesla home battery, the consumer battery that would be for use in people’s houses or businesses fairly soon,” company’s CEO Elon Musk said during the latest earnings call, adding that the design stage of the product is over.

The new type of battery is likely to be unveiled in the next “month or two,” Chief Technology Officer JB Straubel stated, adding that the idea is “really great” and “I’m really excited about it,” without further elaborating on the details of the design.

 “We are trying to figure out what would be a cool stationary [battery] pack,” Musk said.“Some will be like the Model S pack: something flat, 5 inches off the wall, wall-mounted, with a beautiful cover, an integrated bi-directional inverter, and plug and play.”

Below is one type I saw at The Home Improvement Show in ExCel London