It is Sunday morning and still quite cloudy outside. However, a short moment later, when almost all the clouds in the sky are disappearing and the sun is coming out, we decide to go cross-country skiing in the Zug valley. So we grab our cross-country skiing equipment, including skis, boots and poles, put on a thin jacket and set off on the cross-country ski run. When we arrive at the bottom of the Zug cable car, we already strap on our skis. Then we set off in the direction towards the Zug valley. The cross-country ski run leads past the fishing pond, which is a popular destination in summer. Afterwards, we continue across the golf course and past the Zug biomass heating plant. This supplies all households in Zug with district heating.