It had four units, but due to the aging of the facilities and the increasing demand for electricity, in 2000 it was eventually renovated to a combined cycle power plant and fuelled with Liquefied Natural Gas (LNG).

Groups 1 & 2 were constructed and this increased the power station to a maximum output of 2880 MW.

In 2011, as part of an emergency plan to supply power after the Great East Japan Earthquake, three gas turbine systems were constructed within 4 months.

The total power output of the station is 4380MW and the site covers approximately 760,000 square metres of land.

Originally, the power station burnt coal, but subsequently switched to crude oil.