The Western U.S. could reap huge benefits in pollution savings and reduced spending on fossil fuels by installing more wind and solar power plants, according to a comprehensive new analysis released today by the National Renewable Energy Laboratory (NREL). The study found that obtaining 25 percent of electricity in the Western U.S. from renewable energy will reduce carbon dioxide pollution by up to 34 percent and save $7 billion annually in fossil fuel costs.
The NREL report also conclusively puts to rest the fossil fuel industry myth that wind energy’s pollution savings are smaller than expected because fossil-fired power plants run at lower efficiency when wind is generating electricity. Even at the very high level of renewable energy use examined in the report, the impact on the efficiency of fossil-fired power plants was found to be “negligible,” reducing the carbon emissions reduction benefits of wind and solar by only 0.2 percent, so that on net wind and solar produced 99.8 percent of the expected emissions savings.
A chief reason for the study’s findings is that electric utility system operators can reliably and efficiently integrate wind and solar energy using the same tools they have used for more than a century to accommodate large swings in electricity demand as well as abrupt failures at conventional power plants. Dozens of studies have demonstrated that wind and solar energy only slightly add to total power system variability, and that most changes in wind and solar output are canceled out by much larger opposite changes in supply and demand. System operators in the Midwest and Texas have each been able to integrate more than 10,000 megawatts of wind energy with only very small increases in their need for operating reserves.
As shown above, the study found that one megawatt-hour of wind energy, the amount produced by a typical wind turbine approximately every 90 minutes, saves 1190 pounds of carbon dioxide pollution on average, equivalent to the amount produced by a cross-country drive in a fuel-efficient car. As indicated below, the negative impact on the efficiency of fossil-fired power plants reduced those carbon dioxide savings by only 2.4 pounds, the amount produced by a typical drive to the grocery store.
Some representatives for competing energy sources have spent years propagating the myth that wind energy’s emissions savings are less than expected, despite having no peer-reviewed analysis to support their claims and being contradicted by all independent grid operator data and analysis. It is simple economics and science that wind energy directly displaces the output of the most expensive power plant, which is almost always the least efficient fossil-fired power plant.
Some advocates for competing energy sources have even called for an analysis based on real-world data from emission monitors at power plants. With today’s study they got it, though they may not like the results. It is now impossible for anti-clean energy advocates to continue sticking their heads in the sand denying the reality of wind’s environmental benefits.
Today’s study used real-world hourly emissions data from nearly every power plant in the Western U.S. and was reviewed by 55 experts including representatives from eight utilities. The analysis of wind’s impact on fossil-fired power plants was largely conducted by engineers at Intertek who specialize in optimizing the operation of power plants for utility clients.
Today’s study also produced an interesting result with regard to the cost of cycling conventional power plants. For two of the three natural gas price scenarios analyzed, wind and solar energy (shown below as HiMix) actually reduced the total costs associated with cycling conventional power plants, and in the other scenario those costs only amounted to 0.5 percent to about 2 percent of the $7 billion in annual fuel cost savings produced by wind and solar energy. In addition, previous work by NREL and others has demonstrated that the addition of any new low-marginal-cost energy source, whether a new nuclear, coal, or wind plant, would lead to the same result of additional cycling at existing power plants.
NREL’s report is available here.
NREL will present the study’s results on Wednesday, September 25, at noon ET:
Photo credit: David K. Clarke
Related articles on utility integration – cost:
Fact check: Wind power benefits consumers and environment, in Germany and U.S., September 20, 2013
Correcting fossil fuel industry misinformation about Germany's success with renewable energy, September 10, 2013
Fact check: Correcting math errors leads back to original finding: Wind power is affordable, reliable, August 20, 2013
Citing low costs, Xcel Energy plans 'significant increase' in wind purchases, July 11, 2013
Fact check: Exelon's faulty math (and logic) on wind's consumer benefits, June 11, 2013
Mid-American Energy announces $1.9-billion investment in additional wind generation capacity, May 8, 2013
Georgia Power to acquire 250 MW of wind; utility underscores strategy of portfolio diversity, April 29, 2013
New study answers columnist's questions, confirms wind energy's environmental benefits, April 19, 2013
Fact check: Sen. Alexander's claims about wind energy unfounded, March 27, 2013
Fact check: WSJ goes astray on California's integration of wind, February 28, 2013
Fact check: Pacific Research Institute report by Benjamin Zycher filled with inaccuracies, January 28, 2013
Despite flaws, DOE collaborative report shows more wind and transmission saves ratepayers money, January 23, 2013
Fact check: LA Times has faulty analysis on costs of integrating renewables, December 13, 2012
Lesser misstates facts at Heritage-Exelon anti-wind briefing, November 30, 2012
Fact check: Exelon-funded report inflates wind integration costs, November 2, 2012
Alabama Power 'doubles down' on wind, October 9, 2012
Facts about negative wholesale electricity prices and the Production Tax Credit, September 10, 2012
WINDPOWER 2012 Update: Transmission for wind in western U.S.: Lower cost, lower variability, June 5, 2012
Fact check: Elliott off target on wind and cost savings, June 4, 2012
New study: Wind power can save Midwestern consumers between $3 billion and $9.5 billion annually by 2020, May 23, 2012
Fact check: Lomborg lacking on wind's economics, emissions reductions, March 23, 2012
Fact check: Pavlak errs on wind integration, February 14, 2012
More savings for ratepayers in Southeast as Louisiana utility ups wind purchases, January 26, 2012
Fact check: Trzupek Washington Times op-ed off base on wind's cost, utility integration, January 25, 2012
Fact check: CIEP report on wind integration fatally flawed, January 25, 2012
Wind research generates savings for large utility, November 14, 2011
Xcel Energy: More wind, less cost, October 31, 2011
Fact check: Utility spokesperson errs on wind integration, July 5, 2011
Mythbusting fact: Wind power is valuable even if the wind doesn't blow all the time, April 20, 2011
Fact check: Bryce whiffs on wind power and Texas heat wave, August 12, 2011
War against a cost-saving super grid, May 1, 2010
EWEA study: Wind energy cuts carbon emissions, electricity prices, April 23, 2010
Inexpensive and predictable, January 26, 2010