For two decades, the capacity factor of wind power measuring the mean energy delivered by wind turbines has been assumed at 35% of the name plate capacity. Yet, the mean realized value for Europe over the last five years is closer to 21% thus making levelized cost 66% higher than previously thought. We document this discrepancy and offer rationalizations, emphasizing the long term variations of wind speeds. We conclude with the consequences of the capacity factor miscalculation and some policy recommendations. Click on the link below to download the full document.

This document authored by Acoustic Ecology Institute provides a comprehensive overview of noise issues pertaining to utility-scale wind energy development. This AEI Special Report will be continually updated, incorporating new research, more recent reports, and suggestions/comments from readers. Planned topics to be added over time include: effects of noise on wildlife and habitat, offshore wind energy, and the health effects of chronic noise exposure.

Executive Summary of a document prepared by the Kansas Corporation Commission (KCC) which discusses the cost/benefit of deploying wind turbines to meet the Kansas Governor's challenge “to have 1,000 megawatts of renewable energy capacity installed in Kansas by 2015.” Included below are sections 0.80 and 0.90 of the executive summary. The full document can be accessed by clicking on one of the below links.

Mr. Robert L. Cook, a wildlife biologist and former Executive Director of the Texas Parks and Wildlife Department (TPWD) provided this testimony before the Brown County Commissioners Court. Mr. Cook supports his recommendation that a wind farm tax abatement not be granted on wind projects in the county.

In this letter to residents of Burke, NY, Dr. Nina Pierpont briefly discusses her findings of health impacts on families living in proximity to industrial-scale wind turbines.

This 12-month diary (January 2007 through December 2007) was compiled by Gail Mair. Mrs. Mair lives with her husband Walter in Tuscany, Italy. Gail (fluent in English, German, and Italian) and Walter (a native of Italy) bought this piece of property some years ago and, in October 2006, moved into the (modest) dream house they had just built. It was to be their retirement home. As construction on their new home was coming to an end, wind developer, Gamesa, was completing construction on its windfarm nearby. In November 2006, the turbines were turned on and the problems of noise were started -- Day after day, relentless, unending. Gail and Walter have asked that their diary be circulated widely, in the hope of saving other communities and individuals from the misery they are living through.

Mr. Sean Cox presented evidence at the Resource Management Act hearing for the Te Uku wind farm which directly countered the economic case for the wind farm, its carbon emissions justification, the available wind resource at Te Uku, adverse noise and health effects, and challenged the expertise of some of wind developer Wel's consultants. When completed, Wel counsel Simon Berry asked that the hearing be adjourned to permit the developer time to respond to Mr. Cox's submission. An excerpt of Mr. Cox's testimony is included below. The full transcript can be accessed by clicking on one of the two links provided.

Pace Global Energy Services, LLC (“Pace”) was commissioned by Delmarva Power and Light (“Delmarva”) to independently assess the economic impacts of the proposed Bluewater Wind off-shore wind farm (the “BWW Project”) on Delmarva’s Standard Offer Service (“SOS”) customers. The review undertaken by Pace was based solely on publicly-available information and data sources. The report can be downloaded by clicking on the below link.

This important collaborative document describes the current research on wind energy and the assessment of impacts on nocturnally active birds and bats.