A stakeholder-informed modelling study of Greece's energy transition amidst an energy crisis: The role of natural gas and climate ambition

•We couple two energy system models with a stakeholder-informed fuzzy cognitive map.•The current policy framework is projected to increase gas use by about 50% until 2030.•An ambitious yet feasible RES strategy can lead to zero Russian gas imports by 2026.•Zero-carbon power-sector by 2035 requires penetration of new, expensive technologies.•A diversified renewable mix is more robust to uncertainties on technical constraints.