The Environment Agency permits cover the discharge and disposal of radioactive waste and cooling water and running of standby generators.

BBC: Environmental permits granted for Hinkley Point station

After subtracting the draw of running lights, headlight, cooling fan, among other components, the excess power is available to run add-ons including lights.

MSN: Motorcycle gear gets touch of science fiction

This means sealing air leaks around windows and doors, properly insulating attics, replacing standard light bulbs with compact fluorescent lamps and giving your heating and cooling systems an annual checkup to ensure they're running properly.

FORBES: Magazine Article