My electric bill is PAINFUL!

[stillcleaning]

I adopted a juvenile albino corn snake and a juvenile leopard gecko at the same time about 3 months ago. The gecko, Indica, has a heating pad and my snake, Daiblo has a heat lamp with a dimmer switch set on top of the mesh of his enclosure. I manually dial the light up and down morning and night. Both animals seem to be doing very well. Here's the thing, my electric bill has basically doubled! I can't even believe it. So, what can I do to reduce the cost of keeping these babies? I really enjoy them but wow, what an ongoing hit to my wallet! Any recommendations as to what wattage is the minimum I can get away with or getting rid of the lamp and just doing regular room lighting with a heating pad instead for Diablo on a thermostat? Help!
P.S. Diablo's lamp is 260V 660W