You could design a teleportation power that was still very powerful even while obeying conservation of energy. Imagine you have a store of energy you can convert potential and kinetic energy into or back out of when teleporting, and you can also recharge it by touching a high-voltage wire- you could teleport people to Mars orders of magnitude cheaper than by rocket since you're just paying the raw potential energy difference and don't have to deal with the rocketry equation (burning fuel to move your own fuel), the energy to slow down as you approach, travel delays or anything like that. Or you could do things like teleport a mineral-rich asteroid into earth orbit, then use the energy from that to teleport scientists and miners up to the asteroid. Then when you teleport minerals down to earth you get more energy from that.