Tesla installed a 52 Mega-watt-hour solar energy plant on the island of Kauai . Which has power of 52 megawatt-hours storage and 13 megawatts of panels .(Tesla, Inc. is an American automaker, energy storage company, and solar panel manufacturer based in Palo Alto, California.)
In kauai there’s no natural gas pipeline or rail line to haul in coal, they have traditionally generated electricity by shipping in many barrels of diesel fuel by using thermal power plant .After installing solar plant ,it is expected to reduce the utility cost to generate energy from fuel and it will also help to make clean environment .
There is great power difference during day and night time so tesla offered a large battery that stores charge during day time when demand is low and supply at night time when demand is excess .