Is there pond pump equipment that uses solar energy?

Yes, there are solar pond pumps available. You can find them at Pond Depot (http://www.pondepot.com/solarpondpumps.html) or Foster and Smith Aquatics (http://www.fosterandsmithaquatics.com/pond-supplies/solar-pond-supplies/ps/c/5163/14783). Amazon.com also sells pond pumps.