Finnish city using Yandex data centres to heat its hot water

M?nts?l? to halve gas consumption, reduce C02 emissions by 40% and cut heating costs by 5% by re-using heat generated by Yandex servers.

Data centres in M?nts?l? in Southern Finland, owned by Yandex, the largest search engine in Russia, are being used to heat the city’s water supply. The initiative started functioning after the opening of a heat recovery plant in December 2015, funded by the Finnish energy company M?nts?l?n S?hk? OY, that extracts the data centre’s servers’ excess heat output and uses it to heat the district’s water. This method is substantially cheaper than building and operating a typical gas boiler.
The environmentally friendly project is anticipated to reduce heating costs for M?nts?l? citizens by 5% in the coming year and will cut utility providers’ gas consumption in half. According to M?nts?l?n S?hk? OY, the project will also slash C02 emissions by 40%, corresponding with the EU target set for emission reductions in 2030. This energy collaboration with the city, allows Yandex to cut expenditure on the data centre’s current electricity consumption by as much as a third.
Water is fed from the city’s supply system into heat exchangers at the data centre where large ventilators pump in hot air generated by the servers. This hot air heats the water to 30-45 degrees centigrade, which is then sent to the heat recovery plant which boosts the temperature to the required level of 55-60 degrees. Once the process is complete, the water is transmitted back into the city network.
“We wanted to make full use of the excess energies we produce in order to benefit the community. For us it is important to give back to the community we work among,” says Ari Kurvi, data center manager at Yandex.
Jane Zavalashina, CEO of Yandex Data Factory, the machine learning and big data analytics division of Yandex that will be using the datacentres for European projects, adds, “Yandex Data Factory’s ethos is built around identifying efficiencies, and this is a solid reflection of that. The future of successful business depends on the intelligent exploitation of data, which inherently requires an increased dependence on datacentres. This being the case, we have to be conscious of the environmental impact of our infrastructure.”
So far, only the datacentre’s first stage is operational, with another three yet to go live. Based on the savings already being delivered from only one stage of four, once the entire datacentre is operational, the city expects to be able to completely stop using gas to heat water and rely entirely on the datacentre's heat.
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