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Does anyone know of a manufacturer or company that has engineered a way to capture the excess energy form the cardio equipment, instead of letting it heat dissipate?

Try SportsartFitness -recumbent bike 530r/ 530u -elliptical E8300 both machines are self generated powersupply. They don't have a treatmill.

If you are looking to save money on the electric bill, one way is to switch your equipment to the non-electric kind. Precor and Life Fitness are just two companies that design and produce climbers, cycles and ellipticals that require only your client's energy to power them (as well as treadmills that use less power than traditional models). And, some companies are beginning to develop cardio equipment that requires less energy to power it. For instance, SportsArt Fitness has developed a treadmill with an Eco-Powr motor that uses 32 percent less energy than traditional treadmill motors. You may also want to look for entertainment systems that allow the TVs to turn on only when the machine attached to it is in use. An added benefit to this is reduced wear and tear on the equipment, and a prolonged life -- when they are not in use, nothing is expended from a maintenance perspective.

[from "Fitness Facilities Go Green" by Amy Scanlin, Fitness Management, October 2007]

Using a new technology developed by Clearwater, Fla.-based ReRev.com LLC, Oregon State University has retrofitted 22 elliptical exercise machines in its Dixon Recreation Center as a means of collecting the power produced by students and feeding it back into the power grid. The ReRev technology features a patent-pending system called ReCardio that captures and converts the otherwise counter-productive heat energy from exercise machines.

[from "Student Exercisers Have Energy to Burn," Athletic Business E-News, March 11, 2009]