Google to step up investment in Finnish data center, sources say HELSINKI (Reuters) - Google Inc is set increase its investment in a data centre in eastern Finland, sources familiar with the plan said on Thursday. Google's data centre in Hamina uses a sea water cooling system that was part of an old paper mill which the U.S. company bought from Finnish paper company Stora Enso in 2009. After an initial investment of 200 million euros ($275.65 million), it announced on August 12 an additional 150 million in spending. Sources said the company plans to announce another round of investment in early November, although it was unclear how much it would be. A government official confirmed Prime Minister Jyrki Katinen would attend an event at Hamina on November 4. Finland and other Northern European countries have been popular sites for data centers due to vast amounts of hydro power and cooler climates to help to reduce cooling costs. Microsoft, which is planning to buy Nokia's handset business, has said it will invest more than $250 million in a new data centre in Finland. Google was not immediately available to comment. (Reporting by Ritsuko Ando.