The company said it was investing 150 million euros into remodelling the former paper mill which houses its facility. The expansion will double the size of the server farm in the south-eastern Finnish town.
The planned construction work also includes a face-lift of the facade designed by famous Finnish architect Alvar Aalto. The 18-month expansion project is estimated to employ up to 500 engineers and construction workers.
Once completed, the expanded server farm will create 25 new jobs in addition to the 90 existing positions.
Google bought the defunct Summa paper mill from forest products company Stora Enso in 2009.