Dual Fuel is a plan where you can have electric heat, on a separate meter, with a fossil fuel or storage heat backup and gain the comfort and security of electric heat at a special low electric rate on that separate meter.
The system comprises of two fuel sources - electricity as the primary system - and an alternate fuel such as LP, natural gas, thermal storage or fuel oil as the secondary source. If you presently have an electric heating system, you can still benefit by oil, natural gas, thermal storage or LP. If you have an oil, natural gas or LP furnace or boiler, you can benefit by adding an electric system.
Your Dual Fuel system is then connected by a radio controlled relay on the separate meter to the central control station. During peak periods, when demand for electricity is highest, a dispatcher can switch your home heating system from electric to the secondary fuel for a few hours. Another signal will switch your home back to electric heat. Though rare, the maximum amount of controlling can be 12 hours in a 24 hour period.
Below are electric heat links to websites that have more information on those respective types: