As European resorts experience a decreased precipitation (rainfall), some resorts are having to stringently control their water supply in order to conserve supplies. After the unseasonably warm temperatures and lack of early season snow during recent winters, global warming has been at the forefront of winter sports enthusiasts’ minds. To counter this very real climate change, ski resorts are turning to artificial snow manufacture to protect the survival of mountain communities and the entire winter sports industry.
Snow cannons are becoming increasingly commonplace in France, today 15% of French ski areas are covered by the machines and they are no longer confined to low lying areas. Tignes has equipped the bottom of the runs on the Grande Motte glacier with snow making equipment at 3,000m and Val d’Isère have done the same on the Glacier du Pisaillas to preserve summer skiing. Millions of euros are invested in artificial snow manufacture every year, but the investment comes at a high cost to the environment.
It seems illogical to combat global warning, widely agreed to be created by the burning of fossil fuels, with yet more energy outlay. In some resorts, such as Alpe d'Huez, snow making now consumes more power over an average season than the entire lift system. Furthermore, the machines constitute a visual blot on the landscape and contribute hugely to noise pollution. A single snow cannon emits between 60-80 decibels, the equivalent of heavy traffic, which disturbs mountain wildlife.
So how do they work? Snow cannons spray water at great pressure into sufficiently cold air which then falls as snow on the ground. However, any long-term environmental impact of this at present is uncertain. We do know that artificial snow is much denser than natural snow and it takes a metre cubed of water to make two metres cubed of snow. This artificially created snow has an effect on the vegetation and melts much later than natural snow.
The manufacture of artificial snow is costly both in terms of energy and quantities of water required. It is estimated that snow making in France uses as much water as a town with 170,000 inhabitants. Everyone knows that water freezes at 0°C but the rainwater found in reservoirs for snow making has to be cooled to around -7ºC to -9ºC before it will freeze and make snow. If it is necessary to make snow at warmer temperatures, agents such as Snomax™ are added. This is a protein which provides a nucleate for ice crystals enabling freezing at temperatures around -3ºC. York International says that Snomax™ is completely safe but extensive studies have not been carried out to determine the overall effects of such additives on the environment. Despite the construction of reservoirs, snow making uses vast quantities of water with consequences on a region’s water courses and aquatic wildlife. A case in point would be this summer in les Deux Alpes when Mountain Wilderness France, an environmental group, were furious to discover the lift company were ice making on the summer ski area. The glacier de Mont Lans is losing around 10cm depth a day and the lift company was collecting the melt water and pumping it to 3,150m where it is colder and their 'snow magic' machine transforms the water into ice. The group is concerned that they're taking melt water that should flow into the rivers, especially important during times of drought like the summer of 2022, and unnecessarily using power at a time when we are all being asked to check our energy consumption. The summer skiing was actually only able to open for a few weeks anyway because of high temperatures and drought conditions.
More worrying is the natural erosion caused by the increase in melt water which runs back down the mountain in the spring. There is also a suggestion that chemical additives used in production affect the natural vegetation. As melt water comes off the slopes, chemicals used in the production of snow potentially find their way into rivers that supply drinking water for the resort.
An efficient snowmaking system will cost a resort up to 15-25% of it's operating costs. Ski Press World reported in 2005 that low lying resorts such as Les Gets (1,172m) were spending up to €300,000 searching for additional water supplies in an effort to meet an increase in resort demands as expansion continues. In response to their use of snow cannons, Les Gets stressed: 'the manufacture of artificial snow did not have any impact on the water supplies', further commenting that their '...snow cannons principally use water supplies which are unsuitable for drinking water.' Whether the same can be said for all other resorts is a different matter! In Val d’Isère a 36,000 square metre reservoir has been built on the Iseran sector to supply water for the snow cannons that will boost the summer skiing available on the Pissaillas Glacier. The STVI Lift company in Val d’Isère are committed to employing summer skiing possibilities with a minimum of consequences for the surrounding environment and its ecology.
With artificial snow currently seen as the saviour of the industry, giving resort owners the confidence to guarantee skiing, these snowmakers aren't going away anytime soon. But given that the vast majority of cannons require low temperatures to operate, such heavy reliance on them in the face of global warming seems risky. Since the long-term answer to the snow question has yet to be found, the debate between environmentalists and the ski industry looks set to continue well into the future.