COGENERATION SYSTEM

To continue power generation even if the supply of a heat medium is interrupted during a power outage.SOLUTION: When a power outage is detected while a fuel cell module 30 is generating electricity and the occurrence of a supply interruption is not detected during the power outage, and when the temperature of a heat medium in a hot water storage tank 70 reaches or exceeds a predetermined temperature indicating that the tank is nearly full, a control unit 44 of a cogeneration system 1 discharges a part of the heat medium in the hot water storage tank 70 through a discharge passage 78, and supplies a heat medium having a lower temperature than the discharged heat medium into the hot water storage tank 70 through a supply passage 84. When the power outage is detected and when a supply interruption is detected during the power outage and the temperature of the heat medium in the hot water storage tank 70 reaches or exceeds the predetermined temperature, the control unit discharges no heat medium through the discharge passage 78, and supplies the heat medium from the hot water storage tank 70 to a heat consuming device 18 to consume the heat of the heat medium in the heat consuming device 18.SELECTED DRAWING: Figure 1 【課題】停電中に熱媒体の供給断が発生しても発電を継続させる。【解決手段】コージェネレーションシステム１の制御部４４は、燃料電池モジュール３０が発電を行っている状態において、停電が検出され、停電中に、供給断の発生が検出されず、かつ、貯湯タンク７０内の熱媒体の温度が満蓄に近いことを示す所定温度以上となった場合、貯湯タンク７０内の熱媒体の一部を、排出路７８を通じて排出させるとともに、排出された熱媒体よりも温度が低い熱媒体を、供給路８４を通じて貯湯タンク７０内に供給させ、停電が検出され、停電中に、供給断の発生が検出され、かつ、貯湯タンク７０内の熱媒体の温度が所定温度以上となった場合、排出路７８を通じた熱媒体の排出は行わず、貯湯タンク７０から熱消費機器１８に熱媒体を供給させ、熱媒体の熱を熱消費機器１８で消費させる。【選択図】図１