The official OR-OSHA report on the August 2007 turbine collapse at the Klondike III wind facility in Oregon can be accessed below. Siemens Power Generation, Inc. was fined $10,500 and cited in part for failing to properly train personnel.

The Role of Wind Energy in a Power Supply Portfolio

....Wind is primarily an energy resource that makes relatively little contribution to meeting system peak loads. Even with large amounts of wind, the Northwest will still need to build other generating resources to meet growing peak load requirements.......But wind energy cannot provide reliable electric service on its own.
When wind energy is added to a utility system, its natural variability and uncertainty is combined with the natural variability and uncertainty of loads. This increases the need for flexible resources such as hydro, gas-fired power plants, or dispatchable loads to maintain utility system balance and reliability across several different timescales. The demand for this flexibility increases with the amount of wind in the system.

Editor's Note Presented on October 20th during the 2006 Electric Market Forecasting Conference sponsored by EPIS, Inc. this addresses, in part, the issue of whether emissions are reduced with the addition of industrial wind energy. This is a large pdf file (8.55MB) and is available via the weblink below.