Energy-saving activities by optimizing steam supply in the site

Japan Semiconductor Corporation Oita Operations

Japan Semiconductor Corporation Oita Operations, which manufactures automotive analog semiconductors, etc., is a type 1 designated energy management factory that uses 80,241 kiloliters of energy per year in crude oil equivalent. Since slightly more than 90% of such energy is electricity, we have been carrying out energy-saving initiatives mainly to reduce the amount of electricity used. Recently, however, we have conducted energy-saving activities with a focus on city gas, of which we use 5,689 kiloliters per year in crude oil equivalent.
Specifically, we reviewed the steam supply system between buildings in the site to minimize heat radiation loss, maximized operational efficiency using water tube boilers along with newly installed compact once-through boilers after more precisely predicting the required steam within the Operations, and adjusted the steam supply pressure.
As a result of these initiatives, we successfully reduced our city gas consumption by 520 kiloliters per year (9.1% compared to the previous year) in crude oil equivalent. These initiatives received Energy Conservation Center Chairman's Award in the Energy Saving Category at the awards ceremony for the 2022 Energy Conservation Grand Prize for excellent energy conservation equipment.

• Energy Conservation Grand Prize (Energy Conservation Center) (Japanese only)
• "FY2022 Energy Conservation Grand Prize" Energy Conservation Center Chairman's Award (Toshiba Electronic Devices & Storage Corporation) (Japanese only)

Awards ceremony for the 2022 Energy Conservation Grand Prize