This paper assesses 27 alternative natural gas supply corridors for the case of Greece, according to a multicriteria analysis approach based on three main pillars: (1) economics of supply, (2) security of supply, and (3) cooperation between countries. The alternatives include onshore and offshore pipeline corridors and LNG shipping, determined after exhaustive investigation of all possible existing and future routes, taking into consideration all possible natural gas infrastructure development projects around Greece. A multicriteria additive value system is assessed via the robust ordinal regression methodology, aiming to support the national energy policy makers to devise favorable strategies, concerning both long-term national natural gas supplies and infrastructure developments. The obtained ranking shows that noticeable alternative corridors for gas passage to Greece do exist both in terms of maritime transport of LNG and in terms of potential future pipeline infrastructure projects. 
Multicriteria decision support to evaluate potential long-term natural gas supply alternatives: The case of Greece