http://item.bettergrids.org/handle/1001/87 Sun, 03 May 2026 13:36:52 GMT 2026-05-03T13:36:52Z http://item.bettergrids.org/handle/1001/752 Title: PRAS: Probabilistic Resource Adequacy Suite Abstract: NREL's Probabilistic Resource Adequacy Suite (PRAS) provides an open-source, research-oriented collection of tools for analyzing the resource adequacy of bulk power systems. Resource adequacy describes a power system's ability to meet demand for electricity. PRAS simulates power system operations under a range of operating conditions to study the risk of failing to meet demand—due to a lack of electricity supply or deliverability— and identify the time periods and regions in which that risk occurs. PRAS performs low-fidelity, high-speed simulations of multi-region power system operations, considering hundreds of thousands of years of unplanned resource outages to quantify the risk and potential nature of energy supply shortfalls in probabilistic terms. PRAS can be used to calculate the capacity credit of variable and energy-limited resources such as wind, solar, and storage and may be complemented with higher-fidelity, deterministic production cost modeling for more detailed operational insights. The PRAS ecosystem includes integrations with other NREL tools, including the Regional Energy Deployment System, the Resource Planning Model, and the Scalable Integrated Infrastructure Planning model. Mon, 21 Apr 2025 00:00:00 GMT http://item.bettergrids.org/handle/1001/752 2025-04-21T00:00:00Z http://item.bettergrids.org/handle/1001/751 Title: Regional Energy Deployment System (ReEDS) Abstract: The Regional Energy Deployment System (ReEDS) is NREL's flagship capacity planning model for the power sector. The model simulates the evolution of the bulk power system—generation and transmission—from present day through 2050 or later. Mon, 21 Apr 2025 00:00:00 GMT http://item.bettergrids.org/handle/1001/751 2025-04-21T00:00:00Z http://item.bettergrids.org/handle/1001/750 Title: Sienna Abstract: The Sienna modeling framework effectively builds, solves, and analyzes the scheduling problems and dynamic simulations of quasi-static infrastructure systems. To meet the needs of evolving energy infrastructure systems, Sienna develops a foundation to fundamentally advance the nation's ability to model individual and integrated infrastructure systems at a range of spatial and temporal scales. Mon, 21 Apr 2025 00:00:00 GMT http://item.bettergrids.org/handle/1001/750 2025-04-21T00:00:00Z http://item.bettergrids.org/handle/1001/749 Title: Resource Planning Model Abstract: The Resource Planning Model (RPM) is a capacity expansion model designed for a regional power system, such as a utility service territory, state, or balancing authority. RPM applies NREL's extensive experience with national-level capacity expansion modeling, particularly the NREL Regional Energy Deployment System (ReEDS) model and production cost simulations to regional electric system planning—to capture how increased renewable deployment might impact regional planning decisions for clean energy or carbon mitigation analysis. Model versions for regions within the Western Interconnection are currently available for research applications and an Eastern Interconnection version is under development. Wed, 01 Jan 2020 00:00:00 GMT http://item.bettergrids.org/handle/1001/749 2020-01-01T00:00:00Z