Google is putting an additional €450m into its Finnish datacentre.
The datacentre, which uses seawater from the Bay of Finland for cooling, was opened in 2011, after Google bought a facility in Hamina from a Finnish paper company.
It spent €200m to buy the property and convert it into a datacentre, and a further €150m on a subsequent project to restore its machine hall, which is due for completion early next year.
The latest round of investment, announced on Monday will be used to increase the datacentre's size threefold, according to Google. The company attributed the expansion due to growing demand from consumers for mobile video, Bloomberg said.
Headcount at the facility will rise from 90 to 125 as a result of the expansion.
The facility is powered by wind power from Sweden, after Google signed a deal earlier this year to buy the entire output of a new 24-turbine wind farm in the north of the country.
Microsoft is also in the middle of a datacentre building effort in Finland. When the company announced its intention to acquire Nokia's device and services unit for €5.4bn, it also said it would open a €250m datacentre in the country to serve European customers.
Facebook also has a large datacentre in the region, although its facility is located in neighbouring Sweden. Based in Luleå, near the Arctic Circle, the datacentre is Facebook's first outside of the US, and went live in June this year.