Coal prices have risen internationally and percolated to the free market rates for coal clocking a premium of 10-15% over the usual rates during this time of the season, coal traders said. A news report from S&P Global Energy on March 23 said that the Platts CFR India 4,200 kcal/kg GAR rose from $67/mt on Feb 27 to $77.40/mt on March 20, supported by stronger buying interest in parts of Asia and firmer energy market sentiment.