In this paper key applications of blockchain (and smart contracts) are reviewed coming from across different industries around the world, and lessons learned are pulled from this review with a specific focus on what can be learned regarding the energy industry and in relation to the energy transition in particular. While it is difficult to obtain clear conclusions based on such early stage applications in other industrial sectors, like the financial sector, some basic insights emerged that could provide general lessons learned to inform players in the energy industry (in particular utilities and the innovation ecosystem around them) about the potential for blockchain in the energy industry, considering of course that stakeholders in this industry operate and innovate under a highly regulated market.