Overview This video presents Part II of the bulk power systems learning module hosted by the NARUC Center for Partnerships and Innovation in collaboration with the Pacific Northwest National Laboratory (PNNL). The session explores advanced resource adequacy topics crucial for the clean energy transition, including climate resilience, energy droughts, grid-forming inverters, and leveraging energy storage as a transmission asset.
Key Findings & Highlights
Climate Resilience & "Energy Droughts": Dr. Nathalie Voisin and Juliet Homer emphasized that historical weather data is no longer a reliable predictor for future grid planning. As the grid relies more on weather-dependent renewables, planners must utilize downscaled Global Climate Models (GCMs) to prepare for shifting peak loads and "energy droughts" (compound periods of low wind and solar output). Effective planning must also account forinter-regional dependencies, as extreme weather impacts resource availability across interconnected regions (e.g., balancing Northwest hydro constraints with Southwest thermal/solar generation).
Grid-Forming Inverters (GFM) for System Stability: Dr. Wei Du highlighted the critical need to transition from grid-following (GFL) to grid-forming (GFM) inverters. As traditional synchronous machines retire, GFL inverters are insufficient to maintain grid stability. GFM technology allows inverter-based resources to actively regulate voltage and frequency, dominating and stabilizing the grid. PNNL has developed the first WECC-approved GFM model, which is currently undergoing real-world demonstration at the Wheatridge power plant (a combined wind, solar, and battery site).
Energy Storage as a Transmission Asset (Dual-Use): Jeremy Twitchell discussed how energy storage can be deployed to manage thermal limits on transmission lines, resolve contingencies, and defer expensive infrastructure upgrades. He explored the "dual-use" framework, where an energy storage system functions as both a regulated transmission asset and a competitive market participant. While this approach can significantly reduce net costs for consumers, it requires clear regulatory frameworks to resolve barriers related to market participation rules, ISO independence, and cost recovery.
Conclusion To maintain a reliable and resilient grid, regulators and utility planners must move beyond traditional metrics. Success requires the adoption of sophisticated climate forecasting, the integration of advanced stability technologies like GFM inverters, and the modernization of regulatory frameworks to unlock the full value of flexible assets such as dual-use energy storage.
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