A Contracting Party through whose Area Energy Materials and Products may transit shall not be obliged to
(a) permit the construction or modification of Energy Transport Facilities; or
(b) permit new or additional Transit through existing Energy Transport Facilities,
which it demonstrates to the other Contracting Parties concerned would endanger the security or efficiency of its energy systems, including the security of supply.
Contracting Parties shall, subject to paragraphs (6) and (7), secure established ows of Energy Materials and Products to, from or between the Areas of other Contracting Parties.