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Resource Documents: Emissions (114 items)

RSSEmissions

Also see NWW "grid" FAQ

Documents presented here are not the product of nor are they necessarily endorsed by National Wind Watch. These resource documents are provided 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.


Date added:  September 11, 2017
Emissions, GridPrint storyE-mail story

How does intermittent wind power interact with controllable power?

Author:  Deroover, Marc

This article considers a typical load supplied by a set of identical controllable units. More and more wind power is then added to the production system, and the simulation shows how the system behaves and how the wind power is used.

The analysis considers only the energy and power balances at system level, using the Load Duration Curve representation of the load. No consideration is given to the network constraints, power prices and other similar topics. It is basically a theoretical exercise that uses simple hypothesis and modelling techniques to simulate the injection of intermittent power into a classical thermal system, and tries to illustrate what intermittent power is, how it works and what are its intrinsic limitations.

When a wind turbine begins to produce power, some running mirror controllable unit must reduce its output: this is backdown power. The amount of reduced power must remain ready to be produced again if the wind stops blowing: this is backup power. The wind turbine is so tightly coupled with its mirror controllable unit that from the point of view of the network operator they cannot be treated separately. Using this approach, it is possible to describe the way the wind power is inserted into the system, and to calculate the expected resulting output of the various units.

The model shows that the intermittent power is not “added” to the controllable power but is rather “merged” with it, partly replacing the controllable power and energy by its own. It explains why installation of wind power could not result in a reduction of installed conventional power. It describes how wind power destroys the power system by forcing controllable units to run in base. It shows the limits on installed wind power, and that these limits are mainly related to the availability of storage capacity. It asserts that the lack of storage capacity becomes critical when the total installed wind power exceeds some identified thresholds. Finally it describes how we could quantify the savings of CO₂ emissions due to wind power – and shows that there are probably no savings at all.

How does intermittent wind power interact with controllable power? The Dual IC model

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Review of the Regional Greenhouse Gas Initiative

Author:  Stevenson, David

The nearly decade-old Regional Greenhouse Gas Initiative (RGGI) was always meant to be a model for a national program to reduce power plant carbon dioxide (CO₂) emissions. The Environmental Protection Agency (EPA) explicitly cited it in this fashion in its now-stayed Clean Power Plan. Although the RGGI is often called a “cap and trade” program, its effect is the same as a direct tax or fee on emissions because RGGI allowance costs are passed on from electric generators to distribution companies to consumers. More recently, an influential group of former cabinet officials, known as the “Climate Leadership Council,” has recommended a direct tax on CO₂; emissions (Shultz and Summers 2017).

Positive RGGI program reviews have been from RGGI, Inc. (the program administrator) and the Acadia Center, which advocates for reduced emissions (see Stutt, Shattuck, and Kumar 2015). In this article, I investigate whether reported reductions in CO₂ emissions from electric power plants, along with associated gains in health benefits and other claims, were actually achieved by the RGGI program. Based on my findings, any form of carbon tax is not the policy to accomplish emission reductions. The key results are:

David Stevenson is Director of the Center for Energy Competitiveness at the Caesar Rodney Institute. He prepared this working paper for Cato’s Center for the Study of Science.

Download original document: “A Review of the Regional Greenhouse Gas Initiative

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Date added:  June 22, 2017
EmissionsPrint storyE-mail story

Why wind power does not substantially reduce emissions

Author:  Various

Several analysts (links below) have examined the consequences of fossil fuel-fired generators, particularly natural gas, having to modulate their output and frequently start and stop to balance the highly variable infeed from wind turbines so that electrical supply is stable and reliable. The question is to factor in the increased emissions from operating the generators in that way compared with operating them more steadily, i.e., if they were not required to cope with the fluctuating contribution from wind turbines: How do the extra emissions of running the generators less efficiently compare with the emissions saved by running them less?

Since natural gas–fired generators are best able to respond quickly enough to balance wind energy, they have been added almost in parallel with wind (see graphs provided by the Department of Energy’s Energy Information Agency), so it is not wind replacing coal-generated electricity, but wind plus its necessary partner natural gas (which, fracking and methane release aside, is much cleaner than coal). Might it not only be much cheaper and less land-intensive, but also even reduce emissions more to replace coal with natural gas only?

The hidden fuel costs of wind generated electricity” by K. de Groot and C. le Pair

The impact of wind generated electricity on fossil fuel consumption” by C. le Pair and K. de Groot

Wind integration: Incremental emissions from back-up generation cycling (Part V: Calculator update)” [with links to Parts I–IV] by Kent Hawkins

Big wind: How many households served, what emissions reduction? (a case study)” by Kent Hawkins and Donald Hertzmark

Integrating Renewables: Have Policymakers Faced the Realities?” by Kent Hawkins

Integrating Wind Power: Wind Fails in Two Important Performance Measures” by Kent Hawkins

Analysis of Ontario’s electricity system” by Kent Hawkins

Air emissions due to wind and solar power” by Warren Katzenstein and Jay Apt

Cost and quantity of greenhouse gas emissions avoided by wind generation” by Peter Lang

Calculating wind power’s environmental benefits” by Tom Hewson and David Pressman

Reduction in carbon dioxide emissions: estimating the potential contribution from wind-power” by David White

Less than one-fourth of projected fuel savings from wind on Falklands

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Date added:  August 24, 2016
Emissions, Germany, GridPrint storyE-mail story

Germany’s power mix

Author:  Clean Energy Wire; National Wind Watch

The following graphs show: 1) Installed net power generation capacity in Germany 2002–2016; 2) Gross power production in Germany 1990–2015 by source; and 3) German power import/export 1990–2015.

DE-capacity

Note that since 2011, the capacity of nonrenewable sources has not decreased. The slight decrease in nuclear was made up for by an increase in coal.

DE-production

Electricity production from coal and natural gas has hardly decreased, even with the substantial increase of production from renewables.

DE-import-export

Since 2002, when the share of electricity production from renewables approached 10%, overproduction steadily increased. In other words, electricity production from renewables – which does not follow actual demand and in the case of wind is highly variable – was mostly exported into the larger regional grid when it could no longer be absorbed by the domestic grid.

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