Regulation 24. Contracts concluded exclusively between two or more contracting authorities or contracting entities

(a) the contract establishes or implements a cooperation between the participating contracting authorities or contracting entities with the aim of ensuring that public services they have to perform are provided with a view to achieving objectives they have in common;

(b) the implementation of that cooperation is governed solely by considerations relating to the public interest; and

(c) the participating contracting authorities or contracting entities perform in the open market less than twenty per cent of the activities concerned by the cooperation.