This museum is housed in a group of buildings classified as national heritage - the Central Tejo or Lisbon power station. Besides the building itself, the main interest is the machinery used to supply electricity to the city of Lisbon in the first half of the 20C. It includes 19C dynamos and electric motors, steam engines, high-pressure boilers, hydraulic generators and other tools and equipment. Includes great representations of the work and workers involved in the power station's work.