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It costs $595, but a “Bike Power Generator” from  Windstream Power (”Innovations in renewable energy since 1974″) is something an at-home indoor bike trainer enthusiast will understand. The cyclist mounts his bike to a frame while the rear tire turns a friction drum, generating electricity that is either stored in a battery or can be used to power direct-current (DC) appliances (e.g., water pumps) or converted to alternating current (AC) with a DC to AC inverter.  The e-commerce site provides all the details. It is one of the most straight forward ways available to turn bike exercise into electricity for the home.