Electricity Maps provides actionable electricity data for more than 200 regions. We help businesses more effectively reduce their emissions, and enable products and services to differentiate their offerings by empowering end-users to be more carbon-aware. As wind and solar production fluctuate throughout the day, this information needs to be dynamic and updated in real-time. As this real-time information about the physical origin of electricity will be scrutinized and challenged by many parties, the effort has to be collaborative, open, and transparent. This is what motivated the creation of Electricity Maps. It started as a simple real-time data visualization in June 2016 and turned into a comprehensive data platform with high scientific integrity. More than 40,000 people use our app on a daily basis and market leaders like Google and Microsoft, are using our API for extensive projects in order to reach their climate goals and help their users take action against climate change. Our goal: a truly decarbonized electricity system. To get there, we will organize the world's electricity information, and use it to drive the transition toward a truly decarbonized electricity system.