Electrical Japan [ja], a website by researcher Asanobu Kitamoto [ja] lets you explore electric power plants and energy consumption in Japan through data-visualization.

screenshot of power plant database compiled by researchers at Electrical Japan

Screenshot of power plant database compiled by researchers at Electrical Japan

The color of the dots represents the type of power plant, for example fossil-fuel plants are red and hydroelectric plants are blue. The size of the dot represents the amount of power generated. Users can also explore real-time energy consumption [ja] on a regional basis through this map.