The Kauai project consists of a 52 megawatt-hour battery installation plus a 13 megawatt SolarCity solar farm. Tesla and the Kauai Island Utility Cooperative, the power company that ordered the project, believe the project will reduce fossil fuel usage by 1.6 million gallons per year.
This.
Meanwhile in Australia… “Wholesale power prices have doubled since the carbon tax was axed”
Source: Tesla built a huge solar energy plant on the island of Kauai – The Verge