It is a relevant portion of a personal budget, if you include transportation costs. On a national level, though, it's huge. Portugal imports all of its oil and

It is a relevant portion of a personal budget, if you include transportation costs. On a national level, though, it's huge. Portugal imports all of its oil and gas, and has a trade balance that is permanently on the slightly negative side. Energy is a very easy way to fix that, with excellent economic second order effects.