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The Swiss power company Axpo is building a new, underground pumped storage plant – the largest in the country – in the Canton of Glarus. In the future, the plant will guarantee the future electricity supply to northeastern and central Switzerland. The plan is for the plant to pump water from Lake Limmernsee back up to Lake Muttsee – an altitude difference of 630 metres – where it can be used again to generate electricity when required. This large-scale project, which involves investment costs of around 1.7 billion euros and is expected to take the best part of five years to complete, will employ up to 500 people at various construction sites. The plant should start to deliver electricity in 2015/2016. Hundreds of thousands of cubic metres of soil and rock will have to be removed to build the tunnels and caverns for the pumped storage plant. Most of this spoil will be transported to the Muttenalp mountain by cable car and used to build the dam, which will be more than a kilometre long and rise to a maximum height of 36 metres. The rest of the material will be deposited in front of the existing Limmern dam. The company needs to survey the surrounding before implementing the project.