International Energy Agency to help South Africa become more energy efficient avoiding "saving electricity in a hurry"… http://ow.ly/5yPB6
— Leonardo ENERGY (@LeonardoENERGY) July 7, 2011
The greenest kWh is the one that is not consumed. It is often also the cheapest kWh: when comparing investment cost into energy efficiency + energy savings with building new power plants + fuel costs. Could energy efficiency act as an alternative to building new power generation capacity?
However, cost-effective and large-scale energy savings are not quick. Long-term planning is needed. If it comes to a point that an electricity system is no longer adequate to fulfill demand, and energy needs to be saved within the coming years, or even current season, many energy efficiency options will be off the table as being too slow (or alternatively too expensive).