Finland's first floating terminal for liquefied natural gas (LNG) arrived at the southwestern port of Inkoo on Wednesday.
The vessel entered the Gulf of Finland on Monday, but was prevented from entering the deep harbour due to windy weather.
Finland has leased the ship for 10 years from the Texas-based company Excelerate Energy.
Liquid gas brought in by tankers is to be re-vaporised into gas form, and then fed into the Finnish network for distribution to replace fossil gas that was previously imported from Russia.
The Exemplar arrived from Gibraltar, where it was loaded with an initial cargo of LNG prior to departure on 19 December.
According to Olli Sipilä, CEO of the state-owned transmission system operator Gasgrid Finland, the commissioning process will begin with various tests.
"That will probably take a few days," Sipilä told the Finnish News Agency STT.
"Our goal the whole time has been to be able to start using the liquefied natural gas aboard the LNG terminal vessel already this winter. We are now very close to reaching this goal,” said Sipilä.
The 291-metre Exemplar will be anchored to the bedrock. A two-kilometre connecting gas pipeline has been built to link the port to Gasgrid’s transmission network.
Russia cut off gas deliveries to Finland in May due to Finland's refusal to pay for it in roubles as Moscow has demanded.
However as of September Finland was still importing Russian fossil gas by ship to fill a huge tank at the port of Hamina in the southeast.