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As part of the ongoing work to develop Future Arrangements for System Services, SONI and EirGrid have developed proposals for the design of the Day-Ahead System Services Auction (DASSA). These proposals are based on the High-Level Design set out by the SEM Committee (SEM-22-012) and look to review the reserve products to be procured in the DASSA, and the development of a locational methodology that would support RES-E (electricity from renewable generation sources) objectives. Responses to the consultation, preferably structured in line with the specific questions raised in this paper, should be submitted via the SONI or the EirGrid consultation portal by 18th July 2024.