Rakteem Katakey & Kalpana Pathak / New Delhi/mumbai September 19, 2008, 0:04 IST Fertiliser and power plants, which use gas supplied by Petronet LNG, will see their fuel bills rise by up to 50 per cent from January when the country's largest importer of natural gas goes for a price revision. This is expected to increase cost of production for both power and fertiliser units by up to 30 per cent, as fuel constitutes a significant portion of the total cost. As fertiliser prices are capped by the government, the already high fertiliser subsidy bill is also expected to rise significantly.