To tackle the problem of the frequent leakage of tubes of the boilers of the local Guru Nanak Dev Thermal Plant (GNDTP), the Punjab State Electricity Board (PSEB) authorities have decided to use washed coal. To see the benefit of the use of washed coal in GNDTP, the PSEB authorities would use about 10 rake on a trial basis. If the results are better then wahsed coal would be used on a regular basis, official sources said.