ISSUES/LOCATIONS

Documents Home
View PDF, DOC, PPT, and XLS files on line
RSS

Add NWW documents to your site (click here)

Sign up for daily updates

Keep Wind Watch online and independent!

Donate $10

Donate $5

News Watch

Selected Documents

Research Links

Alerts

Press Releases

FAQs

Publications & Products

Photos & Graphics

Videos

Allied Groups

Marginal Emissions Factors for Electricity Generation in the Midcontinent ISO  

Author:  | Emissions, Grid, U.S.

Abstract.
Environmental consequences of electricity generation are often determined using average emission factors. However, as different interventions are incrementally pursued in electricity systems, the resulting marginal change in emissions may differ from what one would predict based on system-average conditions. Here, we estimate average emission factors and marginal emission factors for CO₂, SO₂, and NOx from fossil and nonfossil generators in the Midcontinent Independent System Operator (MISO) region during years 2007–2016. We analyze multiple spatial scales (all MISO; each of the 11 MISO states; each utility; each generator) and use MISO data to characterize differences between the two emission factors (average; marginal). We also explore temporal trends in emissions factors by hour, day, month, and year, as well as the differences that arise from including only fossil generators versus total generation. We find, for example, that marginal emission factors are generally higher during late-night and early morning compared to afternoons. Overall, in MISO, average emission factors are generally higher than marginal estimates (typical difference: ∼20%). This means that the true environmental benefit of an energy efficiency program may be ∼20% smaller than anticipated if one were to use average emissions factors. Our analysis can usefully be extended to other regions to support effective near-term technical, policy and investment decisions based on marginal rather than only average emission factors.

Maninder P. S. Thind and Julian D. Marshall, Department of Civil and Environmental Engineering, University of Washington, Seattle, Washington
Elizabeth J. Wilson, Humphrey School of Public Affairs, University of Minnesota, Minneapolis, and Environmental Studies, Dartmouth College, Hanover, New Hampshire
Inês L. Azevedo, Department of Engineering and Public Policy, Carnegie Mellon University, Pittsburgh, Pennsylvania

Environmental Science and Technology, 2017, 51 (24), pp 14445–14452
DOI: 10.1021/acs.est.7b03047

Download original document: “Marginal Emissions Factors for Electricity Generation in the Midcontinent ISO

This article is the work of the author(s) indicated. Any opinions expressed in it are not necessarily those of National Wind Watch.

Wind Watch relies entirely
on User Funding
Donate $5 PayPal Donate

Share:

Get the Facts Follow Wind Watch on Twitter

Wind Watch on Facebook

Share

CONTACT DONATE PRIVACY ABOUT SEARCH
© National Wind Watch, Inc.
Use of copyrighted material adheres to Fair Use.
"Wind Watch" is a registered trademark.
Share

 Follow: