Bagasse Cogeneration: Sugar Mills as Power Plants

Imagine the fibrous, pulpy residue left over after a sugar mill has crushed every last drop of juice out of sugarcane, bagasse, once treated as simple waste to be burned off or discarded, instead being fed into a mill's own boilers to generate steam and electricity, enough not only to run the mill's own crushing and processing operations but, in many cases, a genuine surplus sold back to the state electricity grid.

This bagasse cogeneration model has scaled into a genuinely significant part of India's renewable energy mix, national bagasse cogeneration capacity reached 9,806 MW by December 2024, up from 9,434 MW just eighteen months earlier, with roughly 70 further projects totalling around 800 MW under various stages of implementation, meaning sugar mills collectively function as a meaningful, if often overlooked, renewable power source alongside the solar and wind capacity more commonly associated with India's clean energy push.

This cogeneration income stream connects directly to the sugar mill integrated operations model covered elsewhere on this site, a mill earning revenue from selling surplus bagasse-generated power to the grid, in addition to sugar sales and the ethanol diversion covered elsewhere on this site, gains a genuinely valuable third revenue stream that helps smooth out the sugar price volatility, covered under the minimum selling price discussion elsewhere on this site, that would otherwise leave mill economics entirely dependent on a single commodity's price swings.

Bagasse cogeneration's viability during the crushing season specifically, when fresh bagasse supply is continuous, versus the off-season when mills must either stockpile bagasse or reduce power generation, also explains why many mills increasingly explore supplementary biomass fuel sources during the off-season, extending what would otherwise be a purely seasonal power generation asset into something closer to a year-round revenue contributor.