21 May '11, 1pm

CO2 avoidance cost with wind energy in Australia and carbon price

I’m really struggling with this deep curvature, because it suggests power plants become abominably inefficient. While I can understand a 50% penalty for throttling, simply by looking at turbo genset design specs, I fail to see how it can get to 95% at just 19 percent penetration, except perhaps if all the rest of the grid consists of pulverized coal plants. This would suggest that a 40% efficient coal plant goes to 4%, a little incredible I think. If you assume a sluggish pulverized coal boiler then the heat has to be wasted mostly to throttle, so yes perhaps you can get very low efficiencies this way. But if you assume a single cycle gas turbine grid then I fail to see how you can get more than about 50% inefficiency compared to a 100% combined cycle turbine grid. It would mean that the CCGT is 60% efficient and the single cycle peakers in the wind grid would be 3% effici...

Full article: http://bravenewclimate.com/2011/05/21/co2-avoidance-cost-...

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