Rankine cycle tops out at 40%, gas turbines are more like 50%, and combined cycle, which is really what's being implemented here, can reach around 60%. When th

Rankine cycle tops out at 40%, gas turbines are more like 50%, and combined cycle, which is really what's being implemented here, can reach around 60%. When the gas is essentially free, there's not much incentive for efficiency, but they could have powered the compressor with a smaller yet more efficient combined cycle system. If you can economically extract power from a powerplant's waste heat, the original power plant was suboptimally designed.