Abstarct- This paper aims to discuss promoting energy conservation behaviour as complementary of global efforts towards a sustainable energy future. Today, the world is afficted by various energy sustainable threats, including depletion of energy resources, expensive energy price and climate change. Pressures are mounting among global community to act immediately to revert the energy exhausted planet. Systematic review of literature suggests energy conservation via behavioural approach can results significant reductions in energy demand. This paper explicity expressed the significance of energy conservation from human dimension in achieng a sustainable energy future. Keywords: Energy Conservation Behaviour, Energy Sustainability, World Energy Threats