Resource Documents: Environment (235 items)
Unless indicated otherwise, documents presented here are not the product of nor are they necessarily endorsed by National Wind Watch. These resource documents are shared here to assist anyone wishing to research the issue of industrial wind power and the impacts of its development. The information should be evaluated by each reader to come to their own conclusions about the many areas of debate. • The copyrights reside with the sources indicated. As part of its noncommercial effort to present the environmental, social, scientific, and economic issues of large-scale wind power development to a global audience seeking such information, National Wind Watch endeavors to observe “fair use” as provided for in section 107 of U.S. Copyright Law and similar “fair dealing” provisions of the copyright laws of other nations.
Author: Scottish Forestry
[A Scottish citizen made a freedom-of-information request, to which Scottish Forestry replied as follows.]
Thank you for your request dated 26 November and received on the 5 December and the clarification dated 19 December 2019 under the Environmental Information (Scotland) Regulations 2004 (EIRs).
You asked for:
a) the number of trees felled for all onshore wind farm development in Scotland to date.
b) the area of felled trees, in hectares, for all onshore wind farm development in Scotland to date.
I enclose some of the information you requested.
Specifically data covering renewable developments on Scotland’s national forests and lands, which is managed on behalf of Scottish Ministers by Forestry and Land Scotland. The area of felled trees in hectares, from 2000 (the date when the first scheme was developed, is 6,994 hectares [70 km², 17,283 acres]. Based on the average number of trees per hectare, of 2000, this gives an estimated total of 13.9M.
While our aim is to provide information whenever possible, in this instance the Scottish Government does not have some of the information you have requested. Namely data on renewable developments on privately owned woodlands.
Download original document: “Scottish Forestry information request 19-02646”
Aesthetics, Economics, Environment, General, Property values, Siting, Technology, U.S., Wildlife •
Author: Gross, Samantha; and Brookings Institution
Decreasing greenhouse gas emissions in the electricity sector is crucial to avoiding the worst impacts of climate change. The American public overwhelmingly favors renewable power, and the costs of wind and solar power have declined rapidly in recent years. However, inherent attributes of wind and solar generation make conflicts over land use and project siting more likely. Power plants and transmission lines will be located in areas not accustomed to industrial development, potentially creating opposition.
Wind and solar generation require at least 10 times as much land per unit of power produced than coal- or natural gas-fired power plants, including land disturbed to produce and transport the fossil fuels. Additionally, wind and solar generation are located where the resource availability is best instead of where is most convenient for people and infrastructure, since their “fuel” can’t be transported like fossil fuels. Siting of wind facilities is especially challenging. Modern wind turbines are huge; most new turbines being installed in the United States today are the height of a 35-story building. Wind resources are best in open plains and on ridgetops, locations where the turbines can be seen for long distances.
Even though people like wind and solar power in the abstract, some object to large projects near their homes, especially if they don’t financially benefit from the project. Transmission for renewable power can also be unpopular, and even more difficult to site when the power is just passing through an area, rather than directly benefiting local residents. This is an issue today building transmission to move wind power from the Great Plains and Upper Midwest states to cities in the east.
Technological and policy solutions can lessen the land use impact of renewable power and the resulting public opposition. Offshore wind eliminates land use, but it raises opposition among those concerned with the impact on the environment and scenic views. Building on previously disturbed land and combining renewable power with other land uses, like agriculture or building solar on rooftops, can minimize land use conflicts. Community involvement in project planning and regulations for land use and zoning can help to alleviate concerns. Nevertheless, there is no perfect way to produce electricity on an industrial scale. Policymakers must recognize these challenges and face them head-on as the nation transitions to a lower-carbon energy system.
Download original document: “Renewables, land use, and local opposition in the United States”
Toward understanding the physical link between turbines and microclimate impacts from in situ measurements in a large wind farm
Author: Rajewski, Daniel; et al.
Recent wind farm studies have revealed elevated nighttime surface temperatures but have not validated physical mechanisms that create the observed effects. We report measurements of concurrent differences in surface wind speed, temperature, fluxes, and turbulence upwind and downwind of two turbine lines at the windward edge of a utility‐scale wind farm. On the basis of these measurements, we offer a conceptual model based on physical mechanisms of how wind farms affect their own microclimate. Periods of documented curtailment and zero‐power production of the wind farm offer useful opportunities to rigorously evaluate the microclimate impact of both stationary and operating turbines. During an 80 min nighttime wind farm curtailment, we measured abrupt and large changes in turbulent fluxes of momentum and heat leeward of the turbines. At night, wind speed decreases in the near wake when turbines are off but abruptly increases when turbine operation is resumed. Our measurements are compared with Moderate Resolution Imaging Spectroradiometer Terra and Aqua satellite measurements reporting wind farms to have higher nighttime surface temperatures. We demonstrate that turbine wakes modify surface fluxes continuously through the night, with similar magnitudes during the Terra and Aqua transit periods. Cooling occurs in the near wake and warming in the far wake when turbines are on, but cooling is negligible when turbines are off. Wind speed and surface stratification have a regulating effect of enhancing or decreasing the impact on surface microclimate due to turbine wake effects.
Daniel A. Rajewski
Eugene S. Takle
Russell K. Doorenbos
Department of Agronomy, Iowa State University, Ames
John H. Prueger
National Laboratory for Agriculture and the Environment, Ames, Iowa
Journal of Geophysical Research: Atmospheres
Volume 121, Issue 22, 27 November 2016, Pages 13,392–13,414
Author: Baidya Roy, Somnath; and Traiteur, Justin
Utility-scale large wind farms are rapidly growing in size and numbers all over the world. Data from a meteorological field campaign show that such wind farms can significantly affect near-surface air temperatures. These effects result from enhanced vertical mixing due to turbulence generated by wind turbine rotors. The impacts of wind farms on local weather can be minimized by changing rotor design or by siting wind farms in regions with high natural turbulence. Using a 25-y-long climate dataset, we identified such regions in the world. Many of these regions, such as the Midwest and Great Plains in the United States, are also rich in wind resources, making them ideal candidates for low-impact wind farms.
Somnath Baidya Roy and Justin J. Traiteur
Department of Atmospheric Sciences, University of Illinois, Urbana
PNAS October 19, 2010 107 (42) 17899-17904; doi: 10.1073/pnas.1000493107
Download original document: “Impacts of wind farms on surface air temperatures”