A very useful exercise undertaken by McKinsey. This article features what I like to call a “killer chart” — a chart that you can envision in your head but for which you lack the data to actually construct. McKkinsey has gone ahead and constructed it, and it’s full of interesting insight.
At the low end of the curve are, for the most part, measures that improve energy efficiency. These measures, such as better insulation in new buildings (see “Making the most of the world’s energy resources”), thus reduce emissions by lowering demand for power. Higher up the cost curve are approaches for adopting more greenhouse gas-efficient technologies (such as wind power and carbon capture and storage) in power generation and manufacturing industry and for shifting to cleaner industrial processes. The curve also represents ways to reduce emissions by protecting, planting, or replanting tropical forests and by switching to agricultural practices with greater greenhouse gas efficiency.
In the linked article, McKinsey has some great, practical examples of how the U.S. might improve energy productivity.
Residential heating and lighting. With 25 percent of global energy demand, residential property represents the largest energy-use segment. Key opportunities include fitting out new homes with tight building shells, including chemically treated windows to reduce the amount of cold that comes in during the winter and the amount of heat that comes in during the summer; high-grade insulation; compact fluorescent lighting; and solar water heaters. In addition, higher efficiency standards for appliances and reductions in standby power requirements yield positive returns and simultaneously cut demand for energy. We estimate that these and other technologies in lighting, heating, and cooling could slow growth in residential energy demand to 0.5 percent a year, from 1.4 percent, and reduce 2020 energy demand by 15 QBTUs (or 3 percent of the total).
Electricity generation and distribution. Another large opportunity would come from reducing the losses that arise in generating and distributing electricity. In 2003, 129 QBTUs (30 percent of global energy use) were needed to generate 57 QBTUs of delivered electricity—meaning that generation and distribution consumed nearly 60 percent of all energy inputs. This implies a conversion rate (energy delivered divided by energy used) of around 40 percent. Some of the losses are unavoidable, but even today conversion rates range from under 30 percent in older coal plants to more than 50 percent in newer gas ones. We estimate that new technologies, such as advanced combined-cycle gas turbines, with an IRR of 10 percent or more, could reduce demand by 18 QBTUs as of 2020.
By then, the expansion of China’s power sector will represent 13 percent of the growth in global energy demand. If China meets it by building new, high-efficiency coal plants, the country’s overall energy demand will fall by 7 QBTUs—more than 1 percent of the global total—by 2020.
Steel, refining, and other industrial sectors. There are enormous opportunities to improve energy efficiency by replacing the least efficient tail of production with current technologies and by implementing currently economical energy-saving upgrades. These opportunities could reduce global energy demand roughly 65 QBTUs by 2020.

Posted by econophile 
Posted by econophile
Posted by econophile