This document provides an overview of innovation in the energy sector and the UK government's support for low-carbon innovation. It discusses what innovation is, why it is important for achieving energy and climate goals, and examples of technologies being supported. It outlines the government's £1 billion annual spend on energy innovation and describes various programmes and funding mechanisms used to support both technology push through grants and demonstration projects, as well as market pull through subsidies and policies. International collaboration is also highlighted as important for delivering the scale of innovation needed.