It is widely accepted that the implementation of climate policies through energy efficiency measures and increased use of renewable sources in energy mix would enhance energy security. However, some induced effects have to be considered when talking about impacts of climate policies on energy security. The objective of this study is to analyze the energy security in global and EU transition prospective scenarios using POLES model and integrating COP21 objectives. We also propose a further analysis of energy security issues with respect to two elements of crucial importance in the European context: role of gas in European energy mix and the impact on grid stability of the high share of intermittent renewable.