LONDON, March 28 (Reuters) -
* Liquefied natural gas (LNG) vessel owner GasLog Ltd has agreed a 12-year charter contract with world's largest LNG buyer, Japan's JERA, it said on Thursday.
* The charter for a 180,000 cubic metre new build vessel will start in April 2020 when it is delivered from Samsung Heavy Industries' shipyard in South Korea.
* The rate for the vessel is "in line with mid-cycle rates," GasLog said.
* The firm did not disclose the exact price level but said it had previously quoted mid-cycle rates as being between $70,000 per day and $75,000 per day.
* Earlier this year, GasLog concluded long-term charter deals with Spain's Endesa and United States' Cheniere but the 12-year deal with JERA is GasLog's longest current charter.
* GasLog owns 32 LNG carriers, including 25 ships on the water and seven LNG carriers on order.
* Japan's JERA Co. is a fuel trading joint venture between Tokyo Electric Power and Chubu Electric Power. (Reporting by Ekaterina Kravtsova; editing by Nina Chestney)