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Core DA Publication Tool update planned

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Dear Core CG members,

 

Core TSOs would like to inform you that on 16/09/2024 the Core DA Publication Tool will be updated with replacing “ShadowPrices” page with two new pages in order explicitly show the market limiting constraints

  • Active FB constraints
  • Active LTA constraints with shadow prices

 

The Publication Handbook will be updated regarding:

  • Max Net Positions
    • This page displays the minimum and maximum Core net positions in MW of each hub for each MTU of the day. These indicators are extracted from the union of the final flow-based domain and final bilateral exchange restriction which together describe the cross-zonal capacities provided to the market coupling.
  • Max Exchanges (Maxbex)
    • This page displays the maximum bilateral exchanges between two Core hubs with the assumption that the other net positions are zero. These indicators are extracted from the union of the final flow-based domain and final bilateral exchange restriction which together describe the cross-zonal capacities provided to the market coupling.
    • For all combinations (hub_i → hub_j) (excluding HVDC borders): maximize the physical net position of a specific hub with the same constraints as in “Max./min. net positions” calculation, and with one additional constraint to force 0 NPs for all hubs, except for i and j.
  • LTN
    • This page displays the nominated capacity from long-term auctions in MW, per border in both directions. Most of the borders make use of FTR (financial transmission rights) thus no capacity is nominated. Only the borders using PTR may have physical nominations.
  • Scheduled exchanges
    • This page displays the capacity allocated by the market coupling algorithm in both border directions for defined borders in MW. The published data relates only to DA and does not take LTN into account.
  • Spanning/DFP
    • This page displays MTUs in which a fallback was applied during capacity calculation like spanning or default flow-based parameters due to technical or other issues in the daily process.
    • ‘Default flow-based parameters’ means the pre-coupling backup values calculated in situations when the day-ahead capacity calculation fails to provide the flow-based parameters in three or more consecutive hours. These flow-based parameters are based on long-term allocated capacities.
    • ‘Spanning’ means the pre-coupling backup solution in situations when the day-ahead capacity calculation fails to provide the flow-based parameters for strictly less than three consecutive hours. This calculation is based on the intersection of previous and subsequent available flow-based parameters;
  • Active FB constraints
    • This page displays the binding active FB constraints (CNECs) after Market Coupling, with its associated shadow price. Shadow prices in the FB model represent the effect on the social welfare of a marginal increase (1 MW) of the RAM. In a FB model, the price differences among bidding zones are the result of shadow prices on all congested CNECs - i.e., active FB constraints. The structure of the page displays CNE and Contingency EIC and Names as well as the detailed breakdown of parameters similar to the initial/final Computation page cf. 5.14 but instead pre-solved the cells are filled with the shadow price the limiting CNEC has.
    • MaxZ2Zptdf formula
      • The Hub From/Hub To columns refer to the maxZ2ZPtdf columns and indicates for which cross zonal exchange the binding CNEC has its maximum sensitivity. The Max z2zPTDF is defined as the maximal hub to slack PTDF minus the minimal hub to slack PTDF according to equation 5 in DA CCM Article 11.
    • RAM@MCP
      • The RAM@MCP represents the RAM relative to the market clearing point. When the alpha variable value is equal to 1, then the active constraints have RAM = 0 MW because the marketclearing point is limited by the active FB constraints only. When the alpha variable value is in between 1 and 0, the RAM@MCP can be both non-negative and negative. RAM@MCP for an active FB constraint is negative due to the enlarged convex combination of the FB domain and the LTA domain - i.e., the LTA domain not covered by the FB domain.
  • Active LTA constraints with shadow prices
    • This page displays the active LTA constraints after Market Coupling, with its scaled shadow price by the alpha variable. Quantity (Qty) represents the limit set by LTA inclusion. The shadow price of LTA constraints is identical to their classic ATC counterparts. Shadow prices from the active LTA constraints represent the effect on the social welfare of a marginal increase of the LTA quantity, which is equivalent to the resulting price difference between the two bidding zones concerned.
  • API impact
    • a new value (ramMcp) is listed in the API under "/shadowPrices" endpoint (displayed as "Active FB constraints")
    • new endpoint /activeLtaConstraint added
    • changed values in response in the MEMONITA and ITMONITA borders on RefProg page (endpoints are the same as before)

 

Useful links:

  • Publication Tool LINK
  • PuTo Handbook LINK
  • PuTo Core DA UAT environment for market participants testing purposes LINK

 

Should you have any questions or concerns, please reach out via the Q&A Forum - LINK