Tata Power prefers coal to LNG or liquid fuels Vol 6, PW 8 (19 Jun 02) News in Brief Tata Power is turning its back on gas and liquid fuels in favour of coal. Indian coal, with a low calorific value and 30% ash content, is considered among the dirtiest in the world. ... Buy this article forRs590 $9For a 30-article or annual subscription rates click here Data not available in ...