The weekly mandatory hydro management declaration shall be submitted by the relevant Balancing Service Providers every Thursday by 12:00 ΕΕΤ and shall refer to a period of seven Dispatch (7) Days in total starting on the following Saturday. The weekly mandatory hydro management declaration shall specify the estimated quantity of mandatory energy injections for each Dispatchable hydro Generating Unit and for each Dispatch Period of the Dispatch Days to which the declaration refers and shall correspond to the following mandatory operations:

a) water supply,

b) irrigation, and

c) ecological supply.

The Balancing Service Providers representing Dispatchable Hydro Generating Units must substantiate the energy quantity declarations for the mandatory operations on a weekly basis, by submitting data on the said operations and on the inflow-outflow water balance in the reservoirs. The data substantiating the declarations shall be both actuarial and budget data and shall be published on the website of the HETS operator. The weekly mandatory hydro management declarations for each Dispatchable Hydro Generating Unit are binding and cannot be amended for energy quantities corresponding to paragraph 1, item (c), of this article. 

Balancing Service Providers representing Dispatchable Hydro Generating Units may submit a request for amendment of the weekly mandatory hydro management declaration with regard to the information as per paragraph 1 of this Article for emergency reasons, which include cases of violation of the Maximum Reservoir Safety Level, other safety reasons or special works and third-party claims. The Balancing Service Provider shall fully substantiate the request for amendment. The HETS Operator may request additional information at a later stage if in its judgment the justification is not complete. In case of amendment of the weekly mandatory hydro management declaration, the HETS Operator shall notify the Participants as soon as possible.