The HydroWIRES (Water Innovation for a Resilient Electricity System) portfolio is organized into four interrelated research areas: 1) Value under Evolving System Conditions, 2) Capabilities and Constraints, 3) Operations and Planning, and 4) Technology Innovation. The mission of HydroWIRES (https://energy.gov/hydrowires) is to understand, enable, and improve hydropower’s contributions to reliability, resilience, and integration in a rapidly evolving electricity system. The initiative includes five national laboratories, PNNL brings expertise in valuation, market analysis, and grid integration and environmental performance of hydropower. Specifically, how hydropower capabilities contribute to the future grid and the capabilities and constraints of hydropower operations.