In the auction tool, you should be able to see the maintenance periods as soon as the Offered Capacity has been published;
However, according to Article 29 (Auction Specification) for yearly Auctions the Allocation Platform shall publish the provisional and the final Auction Specification no later than one (1) week and for any other shorter Capacity Allocation timeframe no later than two (2) Working Days before the end of the Bidding Period of an Auction.
JAO S.A shall notify the affected holders of Long Term Transmission Rights as soon as possible of a curtailment of Long Term Transmission Rights including the triggering event via email and on the webpage of the Allocation Platform.
The notification shall identify the affected Long Term Transmission Rights, the affected volume in MW per hour for each concerned period, the triggering events for curtailment as described in Article 56 and the amount of Long Term Transmission Rights that remain after the curtailment.
In the case of Financial Transmission Rights, each Registered Participant affected by curtailment shall lose its right to transfer or return the concerned Financial Transmission Rights or to receive remuneration in accordance to Article 48.