Day-Ahead Ancillary Services Initiative Key Project

Access NEPOOL technical committee materials and FERC filings and orders related to the Day-Ahead Ancillary Services Initiative (DASI) Key Project.

Project Overview

The Day-Ahead Ancillary Services Initiative project developed a market design for procuring and transparently pricing the ancillary service capabilities needed for a reliable, next‐day operating plan with an evolving generation fleet.

One component involves procuring a new day‐ahead ancillary service to cover the “gap” when the day‐ahead market’s physical energy supply awards are below the ISO’s forecast real‐time load. The second component is to procure day-ahead flexible response services to ensure the system is prepared to recover from sudden source‐loss contingencies and can respond quickly to fluctuations in net load during the operating day.

DASI will go live and replace the Forward Reserve Market for the March 1, 2025 operating day.

Learning Resources and Related Links

• See the Participant Readiness Project Outlook page for information market participants need to prepare for DASI implementation, including changes to existing systems and procedures. Readiness pages provide details on the project and actions required, as well as links to training materials and other resources.
• Subscribe to a curation of targeted DASI-specific training content in ISO-TEN called a Playlist. This central location contains training modules about different aspects of the DASI rollout.

The Day-Ahead Ancillary Services Initiative project is just one of several key projects at the ISO, which continuously undertakes a variety of short- and long-term projects to enhance the region’s competitive wholesale electricity markets and ensure reliable operation of the power grid.