Diageo Plc said on Monday it will spend £180m ($220m) in green energy and water recovery solutions at 11 of its African breweries. The initiative represents the company’s largest environmental investment in over a decade.

The company said it will switch to renewable energy at three brewery sites in Kenya and Uganda. New biomass boilers will be installed to replace systems that use heavy fuel oil. The boilers will use sustainable fuel alternatives such as wood chip, bamboo, and rice husks to create steam power for the breweries, reducing carbon emissions by 42,000 tonnes.