Static electricity

Static electricity was utilised by the Daleks in their city on Skaro, rather than using an internal power source they picked up power through the floor. The Doctor, Ian, Barbara and Susan realised this by the smell they made when moving, and attributed it to dodgems at a fairground. They disabled a Dalek by pushing it onto a Thal cloak, insulating the Dalek base from the electricity. They then used the empty Dalek shell to inifiltrate the Dalek city.(DW: The Daleks)

The Trods were also powered by static electricity. (TVC: The Trodos Tyranny)

Edward Waterfield also experimented with static electricity. (DW: The Evil of the Daleks)