Energy Utilization Efficiency
The graph labeled “Figure 19”  projects energy use in the U.S. per person (blue line) and per dollar of GDP (green line). The right hand portion of the graph (2013 – 2040) projects that annual energy consumption per American will remain rather constant, although well below consumption in 2005. Annual energy consumption per dollar of GDP, on the other hand, is projected to continue to decline. If this projection holds, only half as many watts of energy will be required to produce a constant dollar’s worth of GDP in 2040, as compared to 2005. Said another way, American energy utilization efficiency is projected to double over the period 2005 – 2040!
This improvement is a global phenomenon. The International Energy Agency (IEA) states its importance this way: 
“Energy efficiency in IEA member countries improved, on the average, by 14% between 2000 and 2015. This generated energy savings of 450 million metric tons of oil in 2015, enough to power Japan for a full year. These savings also reduced total energy expenditure by 540 billion United States Dollars in 2015, mostly in buildings and industry.”
$540 billion in efficiency savings sounds pretty good to me. But that’s for the whole world. Here is a more up close and personal example of what energy utilization efficiency can mean:
Lighting Industry Disruption
I have recessed lighting in the kitchen of my home. There are three ~ 5” diameter (BR-30) recessed fixtures and ten ~ 2.5” diameter (GU-10) recessed fixtures. I replaced the three 75 watt halogen bulbs from the larger fixtures and the ten 50 watt halogen bulbs from the smaller fixtures with size – equivalent LED bulbs. The larger LED bulbs each draw 9 watts, while the smaller bulbs each draw 5 watts. Right: a total of 77 watts of power draw replaces a total of 775 watts – nearly a 10 to 1 improvement.
Actually, there is a lot more to LEDs beyond reducing your electric bill, welcome as that is. The LED value proposition offers at least these features:
- Bulb prices are now competitive with older technology. 
- Bulb service life expectancy is several times longer than older technology.
- Significantly lower power requirements.
- Much less heat generation.
- Bulbs are readily available in many form factors.
- Available in several color spectra.
- Available with an increasing number of intelligent control alternatives – bulbs and fixtures.
The case for LEDs is so strong that Greentech Media,  referencing a report from Goldman Sachs, says:
“The financial institution calls LEDs one of the fastest technology shifts in human history. While wind and solar are challenging the traditional electric generation sector, they have not upended it yet the way LEDs have overtaken the lighting industry. By 2020, LEDs will make up 69% of (lighting) sales and close to 100% by 2025, up from nearly nothing in 2010.”
Best of all, LEDs are an emerging technology, which will continue to evolve. Expect continuing improvements in energy utilization efficiency (it can, and will, get considerably better than the 10 to 1 improvement in my kitchen lighting). Even more importantly, expect completely new ideas as LEDs evolve from replacements in existing sizes and forms to become the creative media of the lighting industry.
Thoughtful comments and experience reports are always appreciated.
… Chuck Harrington (Chuck@JeraSustainableDevelopment.com)
This blog and associated website (www.JeraSustainableDevelopment.com) are intended as a resource for smaller manufacturers in the pursuit of Sustainability. While editorial focus is on smaller manufacturers, all interested readers are welcome.
 Energy Efficiency Market Report 2016, International Energy Agency, page13. https://www.iea.org/eemr16/files/medium-term-energy-efficiency-2016_WEB.PDF
 As the snapshot of an LED retail display at my local Home Depot indicates, common residential replacement bulbs are readily available for a few dollars.
 See www.greentechmedia.com/articles/read/led-not-solar-have-transformed-their-industry , which refers to a Goldman Sachs report at www.goldmansachs.com/our-thinking/new-energy-landscape/future-of-clean-energy/index.html