Senior SP V J Chandran said the case had been booked under Section 10 of the POSCO Act following a complaint from the 14-year-old girl, a Class IX student in the school in which Ramesh is the 'Correspondent' (administrator).
The girl had accused him of sexually abusing her for last four years, police said. She made the complaint to the 'Childline' on November 27 as she could not bear the continued harassment.
Ramesh is non-official chairman of the PPA, a statutory body having the authority to approve buildings and other infrastructure in Puducherry.
Further investigation is on, police said.
CPI-M Puducherry unit has demanded Ramesh's arrest.