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Effective Use of Energy


[Energy conservation]
Improving the heat efficiency of thermal power plants, and reducing transmission and distribution loss contribute greatly to energy conservation. This leads in turn to saving of fuels used for power generation, and reduced CO2, SOx and NOx emissions. Kyushu Electric uses a combined cycle power generation system that combines gas and steam turbines, resulting in improving the heat efficiency of thermal power plants. In addition, Kyushu Electric reduces the transmission and distribution loss factor by boosting voltage levels.

Total thermal power plant heat efficiency at Kyushu Electric for fiscal 1999 was 40.4%, an improvement of 0.6 points over that for fiscal 1998. This improvement was brought about by boosting the operating factor of Shin-Oita Power Station (which employs combined cycle power generation), and using LNG more effectively. Our transmission and distribution loss factor is 5.6%, same as the previous year and one of the best levels in the world.

Changes in thermal power plant gross heat efficiency at Kyushu Electric (generating-end)
Changes in thermal power plant gross heat efficiency at Kyushu

Changes in transmission and distribution loss factor at Kyushu Electric
Changes in transmission and distribution loss

Comparison of thermal power plant net heat efficiency (sending-end) and transmission and distribution loss factor
Comparison of thermal power plant net heat efficiency (distribution-end)
The heat efficiency values for Canada and Germany indicate gross heat efficiency values.
Source: "Energy and the Environment", by the Federation of Electric Power Companies





[Efficient use of energy]
Kyushu Electric purchases surplus power from waste-fired power generation facilities, thus utilizing heat exhaust emitted by cleaning factories. This stimulates effective use of related facilities and encourages more efficient energy use in society. In 1999, 317 million kWh of power were purchased due to an increase of contract suppliers.

Changes at Kyushu Electric in surplus power purchased from waste-fired power generation
Changes in surplus power purchased from waste-fired power generation


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