66. The Parties should cooperate to support the delivery of cost efficient, clean and secure supplies of electricity and gas, based on competitive markets and non-discriminatory access to networks. 67. The Parties should establish a framework to facilitate technical cooperation between electricity and gas networks operators and organisations, such as the European Networks of Transmission System Operators for Electricity and Gas, in the planning and use of energy infrastructure connecting their systems. The framework should also include mechanisms to ensure as far as possible security of supply and efficient trade over interconnectors over different timeframes.