Beyond Capacity Credits: Adaptive Stress Period Planning for Evolving Power Systems

Research output: NRELTechnical Report


This paper combines and applies concepts from several researchers to outline an alternative framework to plan power systems for resource adequacy needs, which we call Adaptive Stress Period Planning (ASPP). It first provides background information regarding least-cost planning objectives and the challenge of balancing an increasing need for model representation with computational intensity as power systems evolve in complexity. Next, it motivates the opportunity for a new paradigm by outlining challenges of frameworks in use today that rely on aggregate capacity heuristics (i.e., capacity credits and planning reserve margins). Subsequently, it lays out main process details of ASPP, which more directly represents spatial and temporal dynamics of power systems in a capacity expansion model with a process to adaptively select risk periods. The paper concludes with a summary of the approach, its benefits, and opportunities for future work.
Original languageAmerican English
Number of pages26
StatePublished - 2024

NREL Publication Number

  • NREL/TP-6A40-89386


  • capacity
  • capacity expansion modeling
  • planning
  • resource adequacy


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