The US company said the package would fund three new data centres in Kajaani, Muhos and Vaala, and expand an existing facility in Hamina, which it established after a previous investment. Construction is scheduled for 2027 and 2028.
"This is Google's largest single investment in Europe and a testament to Finland's leadership in responsibly building AI infrastructure," the company said.
As part of the deal, Google signed a 22-year contract with Finnish utility Fortum to buy up to 50% of the output from the Loviisa nuclear power plant.
Finland's Prime Minister Petteri Orpo welcomed the decision, saying: "Google's decision is a clear testament to our strengths." He added: "The value of the data economy extends far beyond direct investment into spurring innovation, research and development. Deepening our collaboration with Google will deliver lasting benefits for both parties."
According to Google, the investment is expected to support more than 37,000 jobs during construction and boost Finland's GDP by €3.6bn per year.
Finland has become an attractive destination for data centres due to its cool climate, abundant low-carbon electricity and uncongested power grid, which reduce the energy needed for cooling servers. The country recently attracted a $1bn data centre investment from TikTok in Kouvola.
Technology companies are competing to secure power supplies as the AI boom drives demand for vast networks of data centres.