Nagoya-based Toho Gas recently announced that it sold its 1,000th fuel cell unit since the household power generators hit the market in May 2009.
Demand for the Ene-Farm system, which can be used to generate electricity and heat for hot water and heating, has surged nationwide amid the power shortages created by the March 11 Great East Japan Earthquake.
The gas company, which sells the system in three prefectures in the Tokai region, expects to sell 900 units this year alone.