Tamil Nadu Electricity Board [TNEB] — Regarding uninformed power cuts

There are frequent powercuts in Melvisharam in Vellore District without any prior information.
The TNEB is indulging in additional power cuts ranging from 5 minutes duration to 30 minutes duration at ANY TIME THEY LIKE...It is very inconvenient for the residents of Melvisharam... To our dismay, the power cuts also happen any time in the NIGHT.. Its quite hard during the night where it distrubs the sleep cycle. The TNEB should come out with an explanation IMMEDIATELY as to What is wrong with them... Though we tried to reach them via phone, they line is always stating busy.
Please provide a valid reason for the above..