The misapplication of the Jevon's Paradox
Consider the following:
High efficient residential lighting has produced significant energy efficiencies
the amount of energy saved per household square foot of space is significantly less than what the bulbs should have produced.
it turns out that many homes have purchased new, large high tech flat screened T.V.s
The misapplication of Jevon's Paradox is to say that the new lightbulbs somehow facilitated the purchase of the T.V.s
The reality is that the T.V.s were part of a technological transformation and a result of behavior and market effects, completely independent of the meager $10.00 per month of electricity savings produced by the bulbs.
It's curious you should use this example, given that the technology which went into the development energy efficient lightbulbs (LED) is the same as that which facilitated the development of large, flat screen televisions. If that's not a perfect example of Jevon's I don't know what is.
For the sake of the discussion, it's also a pretty good example of how rebound effects and Jevon's are closely related, when one zooms out just a wee bit.
Welcome, Revillo. You make the logical point that developing countries have the potential to add significantly to the world's consumption of energy as they modernize.
First, however: Most energy today is consumed by developed countries. And the IEA shows that efficiency has resulted in absolute reductions of Total Final Consumption (TFC) over the last decade for the 18 countries studied, "larger than the total 2011 TFC for the European Union from all energy sources combined."
Jevons paradox for a given civilization simply does not apply.
Of course this rests on your definition of "developed" which could conceivably indicate a country which uses a lot of energy.. and is therefore self evident that developed countries would be energy hogs.
Today the world's largest consumer of energy is China, it is also the country where energy consumption per capita is rising at the sharpest rate whereas in "developed" countries it is typically decreasing (although we'll see what happens in the wake of lower oil/gas prices).
Gains in energy efficiency directly facilitate the growth of so-called emerging economies.
You add that, should these gains be made with solar power instead of fossil fuels, then emissions would decrease. To that I would emphatically agree: we should stop increasing the efficiency of gas-powered cars and coal plants and boilers immediately in order to cap the value of these resources and encourage the adoption of alternatives.
The development of new non-fossil fuel energy sources is probably the only thing we can have hope for, *not* efficiency increases of the predominant hydrocarbon technologies (I'm looking at you, Prius).
Of course if your efficiency gains work hand in hand with solar, improving batteries, manufacturing techniques, efficient appliances, then the solar-panel-to-LED-light seems like a rosy scenario that does in fact reduce an individual's dependence of fossil fuels.
Ultimately though I consider myself to be in Tim Garrett's camp, which states that we can basically always find ways to use more energy to do work and make money, and that efficiency on its own usually increases our energy consumption overall, and in nearly all cases, there will be environmental consequences. Resource limitations are just about the only thing holding humanity back from self-immolation and unfortunately, it doesn't look like they are quite strict enough.