DEME’s Japanese wind contract faces power demand test as data centre boom looms

DEME’s Japanese wind contract faces power demand test as data centre boom looms Belgian offshore wind installer lands 21-turbine job as Japan’s electricity needs from AI centres triple by 2034. On Friday (2026-05-29), Belgian marine contractor DEME, through its Tokyo-based joint venture Japan Offshore Marine, secured a contract to install 21 turbines at the Oga-Katagami-Akita offshore wind project off northern Japan. The deal involves engineering services and charter vessels for the project, which is being developed by Oga Katagami Akita Offshore Wind.⁴ That contract lands as Japan’s power market faces a structural shift that reshapes the calculus for every new generation asset. Wood Mackenzie’s report from Tuesday (2026-05-19) projects that data centres will consume electricity equivalent to 15 million to 18 million households by 2034, driving 60% of Japan’s total power demand growth.³ Data centre electricity consumption is on track to more than triple from 19 TWh in 2024 to between 57 TWh and 66 TWh by 2034, according to the consultancy. Peak demand from these facilities is expected to hit 6.6 GW to 7.7 GW in the same period, about 4% of Japan’s total peak load and a threefold increase from current levels.³ The hyperscaler push is backed by real money. Oracle, Google and Microsoft have been selected as official cloud providers by the Japanese government, unlocking US$28 billion (4 trillion yen) in investment.³ That positions Japan as the next major data centre battleground after the United States, but with a five-year development lag that gives Tokyo time to build out generation. Offshore wind is an obvious answer to that demand pressure. Japan has limited domestic fossil fuel resources and is gradually restarting nuclear reactors after the Fukushima disaster, but the pace remains slow. Renewables offer a politically safer route to new capacity. Yet the near-term LNG picture is tighter than the long-term power narrative suggests. METI reported on Thursday (2026-05-28) that Japan’s LNG inventories for power generation stood at 1.89 million tonnes as of 8 February, down 0.19 million tonnes week-on-week.² That withdrawal came during a period of relatively mild winter demand, raising questions about how lean stocks will look heading into next winter. Asian LNG benchmarks have held firm as post-winter buying continues. As of Saturday (2026-05-30), the JKM spot marker sat at $18.85/MMBtu. [live prices] European TTF front-month was at €46.77/MWh and US Henry Hub at $3.12/MMBtu, with markets closed for the weekend. [live prices] That JKM premium over TTF reflects Japan and Korea’s persistent need for spot cargoes. The divergence in global gas prices matters for Japan because every new offshore wind turbine that displaces LNG-fired generation reduces the country’s exposure to a spot market that has proven brittle during supply shocks. But building offshore wind in Japan is not straightforward. The project DEME is working on faces the same challenges that have slowed Japanese offshore development compared to Europe: deep coastal waters, typhoon risk and a fragmented grid. Wood Mackenzie’s demand forecast suggests Japan is running out of time to solve those problems. The consultancy expects 60% of total power demand growth to come from data centres by 2034.³ That is a concentrated load that will need a reliable supply curve, not intermittent generation alone. Storage is one potential bridge. The consultancy noted that storage projects accounted for roughly 60% of all successful bids in the fiscal year’s capacity auctions.¹ But batteries paired with offshore wind add capital cost at precisely the moment when project developers are already wrestling with turbine prices and vessel availability. The DEME contract is a vote of confidence in offshore wind in Japan. But the project’s real market significance will be measured not by the number of turbines installed, but by how quickly those turbines connect to a grid that must absorb a threefold surge in data centre demand over the next eight years. Traders watching Asian LNG and JKM spreads will be tracking that timeline closely.