The gap between the price of wind and that of thermal generation continues to narrow. On the best sites, wind generated electricity now costs around $0.04/kWh and large projects planned for the next two to three years will bring that figure down even lower. New gas-fired plant now costs at least $0.03/kWh, but comes with an external cost of around $0.01/kWh, so the gap is quite small and higher gas prices and/or lower wind costs will extinguish it. In the US, wind's $0.017/kWh tax credit means it can compete with gas, the price of which is going up again in America.
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Senior Renewable Energy Analyst (WindGEMINI Product Lead) DNV GL Bristol (City Centre), City of Bristol