Impacts of Wind and Solar on Fossil-Fueled Generators: Preprint

Research output: Contribution to conferencePaper


High penetrations of wind and solar power will impact the operations of the remaining generators on the power system. Regional integration studies have shown that wind and solar may cause fossil-fueled generators to cycle on and off and ramp down to part load more frequently and potentially more rapidly. Increased cycling, deeper load following, and rapid ramping may result in wear-and-tearimpacts on fossil-fueled generators that lead to increased capital and maintenance costs, increased equivalent forced outage rates, and degraded performance over time. Heat rates and emissions from fossil-fueled generators may be higher during cycling and ramping than during steady-state operation. Many wind and solar integration studies have not taken these increased cost and emissions impactsinto account because data have not been available. This analysis considers the cost and emissions impacts of cycling and ramping of fossil-fueled generation to refine assessments of wind and solar impacts on the power system.
Original languageAmerican English
Number of pages10
StatePublished - 2012
EventIEEE Power and Energy Society General Meeting - San Diego, California
Duration: 22 Jul 201226 Jul 2012


ConferenceIEEE Power and Energy Society General Meeting
CitySan Diego, California

NREL Publication Number

  • NREL/CP-5500-53504


  • carbon dioxide
  • coal
  • cycling
  • emissions
  • gases
  • load following
  • nitrogen oxide
  • ramping
  • solar
  • sulfur dioxide
  • wear and tear
  • wind


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