** India's top LNG importer Petronet LNG falls 6.2% to 362.75 rupees, biggest pct fall since June 2024

** PLNG top pct loser in mid-cap 100 index , which is up 0.1%

** Citi flags tariff risk for PLNG after Petroleum and Natural Gas Regulatory Board (PNGRB) called to bring regasification - conversion of liquefied natural gas into gas - under regulatory framework

** PNGRB has said despite expansion of LNG terminals in India, gas tariffs have not come down, while PLNG has raised tariffs 5% annually

** Brokerage says PLNG cannot raise tariffs arbitrarily for LNG import terminals if regasification is regulated, retains "sell" call

** With new LNG capacities coming up, there is uncertainty on sustainability of PLNG's strong pricing power - Citi

** PLNG rose ~55% in 2024, logging its best annual gains since 2014

(Reporting by Sethuraman NR, Yagnoseni Das in Bengaluru)

((Yagnoseni.Das@thomsonreuters.com;))