Innovation is the key to the future and central to the expansion of renewable sources of energy. There are a number of innovations that could radically transform the clean energy equation. Although renewable energy is growing exponentially around the world these sources of power have a number of shortcoming that make it difficult to scale-up so that they can replace dirty energy sources like fossil fuels. However, those who doubt that renewable energy will be able to replace fossil fuels lack imagination. We need to get outside the box to envision a future powered entirely by clean energy.