![Tesla Kauai solar-energy generation and storage project [photo: The Verge]](https://images.hgmsites.net/tmb/tesla-kauai-solar-energy-generation-and-storage-project-photo-the-verge_100625575_t.gif)
For years, renewable energy has been cast as the most expensive option to reduce emissions and the world's reliance on fossil fuels. But 2016 may have marked a turn for the renewable energy sector, with solar energy in particular rising significantly in output. For the first time in history, renewable energy sources accounted for fully two-thirds...