But then came July, when Mirant, Reliant Energy, Duke Energy, Dynegy and others took heat for their possible role in creating an artificial shortage during the 2001 electric power crisis.

FORBES: Where's The Juice?

Meanwhile, Tohoku Electric Power covers the northern region of Japan and it said its power shortage would depend on how quickly the region and its industries can be rebuilt.

BBC: Japan quake: Nuclear closures to cause power shortages

An area of little doubt: The next few weeks will bring more difficulties to areas untouched by the earthquake and tsunami as the electric utility Tepco institutes rolling blackouts in the Kanto region around Tokyo to cope with a shortage of power.

FORBES: For An Accessible Explanation Of Japan's Nuclear Crisis, Watch 'The West Wing'