
IEA has a new page dedicated to energy efficiency.
As efficiency improves, people or companies can use the same amount of energy to produce more services. This means that the cost of energy for any one service has fallen. This has two effects. The first is that money you would otherwise have spent on energy is released to do something else. The second is that as processes which use a lot of energy become more efficient, they look more financially attractive than they were before. So when you are deciding what to spend your extra money on, you will invest in more energy-intensive processes than you would otherwise have done. The extraordinary result is that, in a free market, energy efficiency could increase energy use.
Making more with less intuitively seems to be good for the environment, and this is the presumption of the current UK policy. However, in a system-wide context, improvements in energy efficiency lower the cost of energy in efficiency units and may even stimulate the consumption and production of energy measured in physical units, and increase pollution. Simulations of a computable general equilibrium model of Scotland suggest that an across the board stimulus to energy efficiency there would actually stimulate energy production and consumption and lead to a deterioration in environmental indicators. The implication is that policies directed at stimulating energy efficiency are not, in themselves, sufficient to secure environment improvements: this may require the use of complementary energy policies designed to moderate incentives to increased energy consumption.
"Since 1998, The EurObserv'ER barometer measures the progress made by renewable energies in each sector and in each member State of the European Union in an as up-to-date way as possible (with figures less than 12 months old). EurObserv'ER produces a series of figure-backed indicators covering energetic, technological and economic dimensions."