I'll have to check out Jumper. The mention of necessary energy and momentum changes reminded me of Niven's teleportation dynamic in the Known Space works. Earth has a teleportation infrastructure analogous to a modern telecommunications network, with "booths" capable of performing necessary momentum and energy tweaks on the fly. Since its global, and generally people teleporting closer to the poles are balanced by people teleporting away from the poles, there's little net energy change over the globe. Large reservoirs of water exist at various main teleportation stations and the water is availible to be teleported up/down or warmed / cooled as needed, to even out intermittent peaks and valleys.  His essay "Theory and Practice of Teleportation" is also an interesting read.