text: The report uses an economic model of New Zealand which is totally unsuited to analysing the effect of 20% energy generation from wind. Any model that does not take into account the intermittent and seasonal nature of wind and its effect on power prices and the fact that, in a dry year, hydro cannot back up wind, is worthless. The model makes no allowance for the fact that over peak demand periods, only about 10% of the wind generation can be relied on. It also does not consider the need for extra transmission lines and the poor efficiency of the gas fired power stations that must be built to back up wind. For example, one study in the United States showed that, in Texas, a large amount of wind energy results in a tiny reduction in carbon dioxide emissions.