"Panasonic is quietly selling grid batteries in the U.S." http://fortune.com/2015/09/10/panasonic-batteries-america/ http://fortune.com/2015/09/10/panasonic-bat

"Panasonic is quietly selling grid batteries in the U.S." http://fortune.com/2015/09/10/panasonic-batteries-america/ http://fortune.com/2015/09/10/panasonic-batteries-america/ They've also done some larger grid storage projects in other countries, and with partners other than Tesla.