S.L. 545.27 ст. 8Setting off payment claims.

(1) The distribution system operator may set off amounts due by an installation operator for the supply of electricity against amounts due to the installation operator for the exporting of electricity under these regulations: Provided that such setting off shall only be permissible where the claims are undisputed or are certain, liquidated and due: Provided further that in the case of solar photovoltaic installations with an installed capacity of more than 100kWp, such set-off shall only apply by agreement of both the distribution system operator and the installation operator.

(2) Where a set-off arrangement between the installation operator and the distribution system operator is in place and the amounts due to the installation operator for the exporting of electricity referred to in sub-regulation (1) are in excess of the amounts due by an installation operator for the supply of electricity by the distribution system operator, the distribution system operator shall credit the installation operator the balance due by means of a credit note: Provided that the distribution system operator shall pay the installation operator the balance due in such credit note for the supply of electricity by the installation operator when two consecutive scheduled bills based on actual meter readings are shown to be in credit and such payment shall be effected within sixty days of the date of the second scheduled bill.

(3) Where the installation capacity is larger than 100kWp and no set-off agreement exists between the installation operator and the distribution system operator and the amounts due to the installation operator for the exporting of electricity are in excess of the amounts due by an installation operator for the supply of electricity by the distribution system operator, the distribution system operator shall credit the installation operator the balance due, which shall be paid to the installation operator within sixty days from the scheduled reading of the metering equipment:

Provided that the distribution system operator shall carry out the reading of the metering equipment within intervals of at least two months, to be reckoned as from the date of the first reading of the metering equipment.