If during a month m, significant imbalances between the amount of energy measured at the energy meters represented by a Supplier p as a whole within a Market Time Unit and the corresponding Market Schedules of the same Supplier occur systematically, the HETS Operator shall impose a charge on the Supplier, which shall be equal to and shall be calculated on the basis of the total absolute deviation within month m $NBA{L}_{p,m}$  and the RMS value of deviations within month m. 

A significant imbalance is considered to be the normalized absolute deviation in month m, which exceeds the tolerance margin $TO{L}_{ld,ADEV}$  or the normalized RMS value of deviations in month m, which exceeds the tolerance margin$TO{L}_{ld,RMSDEV}$.

The deviation $DE{V}_{p,t}$ in each Market Time Unit t, the monthly absolute deviation $ADE{V}_{p,m}$ in month m, the normalized absolute deviation $NADE{V}_{p,m}$ in month m, the monthly RMS value of deviations $RMSDE{V}_{p,m}$ and the normalized RMS value in month m $NRMSDE{V}_{p,m}$, for Supplier p shall be determined as follows:

$DE{V}_{p,t} = M{S}_{pt} - M{Q}_{pt}$

$ADE{V}_{p,m} = \sum _{t\in m} \left|DE{V}_{p,t}\right|$

$NADE{V}_{p,m} = \frac{ADE{V}_{p,m}}{{\displaystyle \sum _{t\in m}}M{Q}_{p,t} }$

$RMSDE{V}_{p,m} = \sqrt{\sum _{t\in m} DE{V_{p,t}}^2}$

$NRMSDE{V}_{p,m} = \frac{RMSDE{V}_{p,m}}{{\displaystyle \sum _{t\in m}\left[{\left(M{Q}_{pt}\right)}^2\right] }}$

where:

The monthly charge to the Supplier p for the month m shall be calculated as the maximum amount of sanctions resulting from the monthly absolute deviation and the RMS values of deviations:

$NCBA{L}_{p,m} =$

$max \left(\begin{array}{c}\left(UNCBAL{R}_{ADEV} · ADE{V}_{p,m}\right) · \left(NADE{V}_{p,m} - TO{L}_{ld,ADEV}\right),\\ \left(UNCBAL{R}_{RMSDEV} · RMSDE{V}_{p,m}\right) · \left(NRMSDE{V}_{p,m} - TO{L}_{ld,RMSDEV}\right),\\ 0\end{array}\right)$

where:

The numerical values of the unitary charges $UNCBA{L}_{ADEV}$ and$UNCBA{L}_{RMDEV}$, and the tolerance limits $TO{L}_{ld,ADEV}$ and$TO{L}_{ld,RMSDEV}$, shall be determined by decision of the RAEWW, subject to a recommendation from the HETS Operator. The above tolerance limits may be expressed on the basis of the offtake $M{Q}_{pt}$ (calculated at the Transmission System/Distribution Network Boundary) in MWh corresponding to the Offtake Facilities of the Interconnected System per Supplier p for the Market Time Unit t. This decision shall be published at least two months prior to the implementation of the new values of the above parameters.

Non-Compliance Charges shall not be imposed on the Last Resort Provider and the Default Provider for significant systematic imbalances in demand and only for the demand they represent in this capacity.

The Market Time Units corresponding to Imbalance Settlement Periods during which a Dispatch Instruction was issued for Balancing Energy supply from a Dispatchable Load Portfolio shall be excluded from the above calculation, with the exception of Dispatchable Load Portfolios with pumped storage capability.