The Balancing Service Providers representing Dispatchable Hydro Generating Units, including Dispatchable Pumped-Storage hydro Generating Units shall submit to the HETS Operator the following hydro management declarations:

a) Yearly ahead hydro usage declarations,

b) Weekly mandatory hydro management declarations and

c) Daily mandatory hydro injection declarations.

The Balancing Service Providers representing Dispatchable Hydro Generating Units are required to:

a) submit to the HETS Operator annual curves regarding reservoir reserves for the last ten (10) years, on a monthly basis. As for the new power stations of Dispatchable Hydro Generating Units, given that the historical data on water levels are limited, they must submit the estimated curves and shall take into account any available historical data.

b) inform the HETS Operator about the reservoir water level of the Dispatchable Hydro Generating Unit and any changes expected, and about the water supply to the reservoir of the Dispatchable Hydro Generating Unit (instantaneous or average for a specific period), one day before the Dispatch Day or on an ad hoc basis, as the HETS Operator deems appropriate.

c) take into account the current level of the relevant water reserves, any forecasts for the evolution of these reserves, their obligations for water supply, irrigation and ecological supply, and ensure that the Safety Minimum Reservoir Level is constantly maintained, when planning the operation of these Units and, in particular, at the time of submission of hydro management declarations and at the time of submission of Techno-Economic Declarations, which include information on the maximum daily energy injection for the Generating Units in question.

d) notify the HETS Operator of the forecasted changes in any components affecting mandatory hydro management as soon as possible after the occurrence of the emergency.

e) notify the HETS Operator, on a weekly basis, of the daily quantity of water in cubic meters and the corresponding energy in MWh that came through the spillway for each reservoir.

The Maximum Reservoir Safety Level and the Minimum Reservoir Safety Level are determined for each Dispatchable Hydroelectric Generation Unit by the RAEWW following a proposal from the respective Balancing Service Provider and the recommendations of the HETS Operator.

The Balancing Service Providers representing Dispatchable hydro Generating Units that are connected to the reservoir may:

a) submit mandatory hydro injection declarations for the above Units to avoid an overflow only when the water level in the relevant reservoir is expected to be equal or higher that the Safety Maximum Reservoir Level.

b) submit declarations of maximum daily energy injection constraint for the above Units only when the water level in the relevant reservoir is expected to be equal or higher that the Safety Minimum Reservoir Level.

Upon expiration of the Dispatch Day, the HETS Operator shall immediately publish the quantity of energy injected by each Dispatchable hydro Generating Unit for each Imbalance Settlement Period of the Dispatch Day.

The HETS Operator shall submit a report to the RAEWW on a monthly basis, containing requests submitted for amendment of weekly mandatory hydro management declarations, outlining the reasons for submission, the supporting documentation provided by the Balancing Service Providers, and the acceptance or rejection of these requests by the HETS Operator, and any other relevant information. 

The HETS Operator shall send a report to the RAEWW by the end of the following month, which shall include at least the following information per day for each Dispatchable Hydro Generating Unit. 

a) the water level in the relevant reservoir,

b) curves on reservoir reserves,

c) total injected energy,

d) mandatory hydro injection declarations with distinct reference to the quantities by reason of overflow,

e) pumping energy.

The HETS Operator shall inform the Energy Exchange with regard to the mandatory hydro injection declarations in accordance with the provisions of the Day-Ahead & Intra-Day Markets Trading Rulebook.

Details on hydro resources management may be specified in the Technical Decision “Integrated Scheduling Process”.