NOVELTY - System (I), comprises: a biological reactor having at least a first chamber containing at least a cathode, culture comprising methanogenic microorganisms and water, and a second chamber containing at least an anode, where the reactor has an operating state, and the culture is maintained at above 50 degrees C; a source of electricity coupled to the anode and the cathode; a supply of carbon dioxide coupled to the first chamber; and an outlet to receive methane from the first chamber.    USE - (I) is useful to: convert electric power into methane; and create carbon credits (claimed).    ADVANTAGE - (I): provides a non-fossil carbon-based energy resource, hence reduces reliance on fossil-based carbon fuels; converts or processes carbon dioxide to generate the energy resource, hence it removes carbon dioxide from the environment, and prevents release of carbon dioxide into the atmosphere or into a storage system or into another process; converts or processes carbon dioxide into methane using electricity to convert electricity into another energy resource when demand for electricity may be such that the electricity would otherwise be wasted or even sold at a loss to the electricity producer; and converts electrical energy or power into methane, which may be transmitted via natural gas transmission pipes which on a per unit energy basis are less expensive than electrical transmission lines and in some locales the electrical transmission lines may not have as much spare transmission capacity as the natural gas transmission lines.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a method of converting electricity into methane, comprising: supplying electricity to an anode and a cathode of biological reactor having at least a first chamber containing at least the cathode, culture comprising methanogenic microorganisms and water, and a second chamber containing at least the anode, where the biological reactor has an operating state, and the culture is maintained at above 50 degrees C; supplying carbon dioxide to the first chamber; and collecting methane from the first chamber;    (2) a method of creating carbon credits, comprising: supplying electricity to an anode and a cathode of biological reactor having at least a first chamber containing at least the cathode, a culture comprising methanogenic microorganisms, and water, and a second chamber containing at least the anode, where the biological reactor has an operating state and the culture is maintained at 50 degrees C; supplying carbon dioxide to the first chamber; and receiving carbon credits for the carbon dioxide converted in the biological reactor into methane;    (3) a biological process for producing methane gas, comprising: providing an electromethanogenic reactor having an anode, cathode, and many methanogenic microorganisms disposed on the cathode; providing electrons to the methanogenic microorganisms disposed on the cathode; and providing carbon dioxide to the methanogenic microorganisms, where the methanogenic microorganisms reduce the carbon dioxide to produce methane gas;    (4) a biological process for producing methane gas, comprising: inserting an anode and a cathode in a methanogenic reactor comprising methanogenic microorganisms; and providing electrons to the methanogenic microorganisms, increasing the efficiency of the methanogenic reactor to produce methane gas; and    (5) an electromethanogenic reactor, comprising: an anode; and a cathode comprising methanogenic microorganisms.    DESCRIPTION OF DRAWING(S) - The figure is a schematic view of a system for converting carbon dioxide into methane.