We treat the wastewater produced by the brewery with our very own wastewater treatment system, which lets us produce a considerable amount of biogas (= green energy). We use this gas to heat our boilers, among others. Green energy, consisting of our very own biogas, accounts for 12% of our total energy requirements. As a result, we use less natural gas, which reduces our impact on the environment and lets us save money.

Grolsch reuses 99.8% of its waste. Take, for instance, the dregs: the residual malt that remains after all sugars and proteins have been extracted. These dregs have a high nutritional value, which makes it a popular form of animal feed, especially for cows. Every year, we turn 50,000 tonnes of dregs into cattle feed, and 25 trucks visit our brewery to pick up this waste product for reuse every week, adding up to over 1,250 trucks per year.