It's looking at total energy consumption, not electricity consumption. The UK only generates about 4500 kWh per person each year - far off that 30,000 kWh number. In the UK (not sure about the US, but it's probably similar), about 25% of our energy consumption is space heating, 30% is road transport, 10% is air transport, 11% is domestic use and the remaining 24% or so is services and industrial. We don't really do AC here - I imagine that's a big chunk of use in southern US states.

The big thing that the article doesn't mention is that "developed" western countries outsource vast amounts of manufacturing energy usage to other countries. The UK is especially bad for this. We don't make most of our steel, aluminium, plastics or chemicals - so the many kWh required to make them isn't reported in our statistics. China does that for us.