India's private sector utility Talwandi Sabo Power (TSPL) has set up a torrefied bio-pellet manufacturing facility in the northern state of Punjab, to ensure steady biomass supply to its 1.98GW coal-fired plant.

The pellet plant has a capacity of 500 t/d or 182,500 t/yr of torrefied bio-pellets, and use agricultural stubble or residue as feedstock, according to TSPL, a unit of mining conglomerate Vedanta. The Punjab region generates around 15-20mn t/yr of crop stubble, according to TSPL. The plant had already purchased over 800,000t of agricultural stubble, which it will convert to around 640,000t of torrefied bio-pellets. The utility is also targeting to reduce "5pc use of coal daily" by replacing the fuel with torrefied bio-pellets.

TSPL also co-fires 450 t/d of torrefied biomass that is purchased from other suppliers in the open market. The utility typically seeks torrefied pellets made from agricultural residue with a minimum of 50pc raw material from stubble, straw, or crop residue from rice paddy. The gross calorific value of pellets procured for its plant usually ranges between GAR 3,400-5,000 kcal/kg.

Vedanta's aluminium unit had also used biomass briquettes for power generation. Its alumina refinery in Lanjigarh, Odisha consumes about 20 t/d of biomass briquettes, according to Vedanta. The briquettes are made from agricultural residue sourced from farmers in India.

By Nadhir Mokhtar