Well, even if you use a gas turbine, such as GE, Seimens, Mitsubishi, Rolls Royce or Mitsui 7 series or the like, with new heat rates below 7, which acutally ups the effciency, you still need to put that power over transmission lines, which creates a rather sizeable line loss in the transmission of power. This would allow for production of power, at the source of use, and would not have any line loss. That means it's in reality much more efficient.
Also, you forget that if methane is used for these units, the first power units to be taken offline will be No 2 and No 7 Oil based units, then baseload coal units, that create HUGE amounts of CO2. Gas fired units will remain in the qeue for back up. Also, nothing is more expensive in the power business than the constrution and maintenence of transmission lines. That cost should be greatly reduced to eliminated.
Also, the efficiency of these now is 60% comparable to existing combined cycle natural gas fired generation, plus the upside of no transmission which makes them much cheaper, since you are not only not paying for the line loss, but for the cost of transmission across the utilities power grid. The more this efficiency goes up, the more in the money this gets. Even with a subsequent rise in gas cost that could be expected from increased Nat Gas demand, you are still way in the money since the US is now SO LONG nat gas. Also, the increase would not be 1:1, since it would be offset by large generation units that would have used natural gas being taken off line.
Also, you forget that if methane is used for these units, the first power units to be taken offline will be No 2 and No 7 Oil based units, then baseload coal units, that create HUGE amounts of CO2. Gas fired units will remain in the qeue for back up. Also, nothing is more expensive in the power business than the constrution and maintenence of transmission lines. That cost should be greatly reduced to eliminated.
Also, the efficiency of these now is 60% comparable to existing combined cycle natural gas fired generation, plus the upside of no transmission which makes them much cheaper, since you are not only not paying for the line loss, but for the cost of transmission across the utilities power grid. The more this efficiency goes up, the more in the money this gets. Even with a subsequent rise in gas cost that could be expected from increased Nat Gas demand, you are still way in the money since the US is now SO LONG nat gas. Also, the increase would not be 1:1, since it would be offset by large generation units that would have used natural gas being taken off line.