Global offshore wind turbine installations reached a record 6,773 MW in 2025, while installation volumes remained close to the five-year average at around 500 turbines. Foundation activity included 644 monopiles and 145 jackets, with Deme’s Orion installing 100 monopiles and Seaway7’s Seaway Strashnov installing 89.
Eight new jack-up installation vessels entered service during the year, including four for Cadeler and one for DEME, alongside additional vessels from Shinfox Far East, Yi Hai Offshore and Dominion Energy. Several lower-specification installation vessels transitioned into operations and maintenance jack-up work to meet continued demand in the 6–10 MW turbine segment. Industry-average wind turbine generator installation duration increased, with mean on-position duration reaching 3.85 days and median duration 2.61 days, driven by largerturbines and activity in new markets including the USA.
Siemens Gamesa accounted for 62% of installed turbines and deployed 168 SG 14 units. GE Vernova installed 85 Haliade-X 13 turbines, Vestas installed 80 turbines including the first 54 V236-15 units, and Vensys installed 11 offshore turbines in South Korea. Cadeler led wind turbine installation with 230 turbines installed, while Van Oord installed 362 foundation components and DEME installed 356.
Operations and maintenance jack-up interventions reached a record of 571 in 2025, with an industry-wide failure rate of 8.2%. Ziton completed 262 interventions, supported by fleet expansion. Increased intervention activity was linked to ageing turbines, particularly the Siemens Gamesa 3.6/4.0 MW platform, and early-life issues in newer wind farms.
Looking ahead, around 900 turbine installations and more than 10,000 MW of capacity are planned for 2026. Further deployment of turbines above 13 MW, continued activity in Poland and evaluation of ongoing reliability trends are expected to shape the offshore wind sector.
Sea Impact is a collaboration between Lautec and Peak Wind, created to share insights from the offshore wind industry.
