something wrong with the electricity arithmatics?

power cuts have been unexpectedly given a reprieve without any prior warning, just as we were getting used to the daily hour of power cut and scheduling work that does not require us to use electricity. a this morning's report about the power status in TN (dinamani) states that, 'due to monsoon rains the weather has cooled down, this has resulted in farmers using less electricity to pump water as well as people not switching on their air conditioners leading to a saving of about 400MW of electricity'...then the report goes on to state that, 'the Mettur reservoir will have to release water for irrigation in august, this will result in lessening of production by 250MW'...it seem strange that the saving due to farmers not using pumpsets will be higher than that of what will be lost due to water being let out in the channels?