You can see it for yourself in the EIA's data on energy intensity of the economy. The amount of energy required to produce a dollar of GDP fell only 20% from 1949 to 1980, but has fallen by about 45% since then -- nearly triple the previous rate.

You think that might have something to do with the offshoring of US industry?

You think that might have something to do with the offshoring of US industry?

That's certainly a factor, but far from the only one. Indeed, the tales of US manufacturing's demise are greatly exaggerated.

See also here or here. US manufacturing is still 20% of the world's manufacturing, commensurate to the US economy's 20% share of the world economy.

Of course, it's worth noting that the world's energy intensity (btu/$ of GDP, inflation-adjusted) has fallen 7-15% in the last 10 years (same EIA data, 15% based on PPP, 7% based on market exchange rates), so it's not like the energy consumption has simply been pushed elsewhere.