The massive increase in energy production and consumption during the twentieth century in industrialized countries has not lead to "energy for all". Large scale inequalities exist between industrialized and developing countries and between rich and poor in a given country. Often influenced by the energy sector, energy policies nearly exclusively focus on increasing energy production capacities ("energy supply") to the detriment of service to the community and individuals.
Today, environmental requirements are strengthening economical and geopolitical constraints that urge for the development of a global strategy based on the principles of sustainable development. This requires reducing as much as possible the environmental damage and economical and social costs linked to energy production and consumption.
An Energy Efficiency Strategy depends on the implementation of measures that allow reduction in energy consumption - or mastering its development in the first place in regions that lack access to appropriate energy services - in all economical and social activities by using efficient appliances and efficiency of methods.
Activities 
