9 . This is about the per-capita consumption of the United States now. This amounts to a consumption asymptote of about 2900x10 15 BTU/year [2900 quad /year or (2900*1055)x10 15 joules/year=3.06x10 21 J/yr=9.69x10 10 kilowatts]: Currently the U.S. uses about 350x10 6 BTU/person (~12 kW/person), industrialized countries average about 200x10 6