Ocean Current Turbine Array OceanCurrent Deep Dive: How Undersea Currents Become an Inexhaustible Power Station

An Overlooked Energy Treasure

Ocean currents carry far more energy than humanity's current electricity demand, yet compared to wind and solar, ocean current power remains virtually undeveloped. The reason is simple — the undersea environment is extremely harsh, with construction and maintenance costs prohibitively high.

Simec Atlantis Energy announced in January 2029 that its OceanCurrent ocean current turbine array deployed in the Taiwan Strait has completed six months of continuous operation testing, with all indicators meeting expectations. This is the world's first hundred-megawatt-scale ocean current power generation project.

Technical Design

OceanCurrent uses horizontal axis turbines, visually similar to underwater wind turbines but heavily optimized for subsea conditions. Each turbine has a blade diameter of 25 meters, made from seawater-resistant carbon fiber composite materials. Turbines are mounted on fixed seabed foundations at 35-60 meters below sea level in the current layer.

The Taiwan Strait's current velocity consistently maintains 1.5-2.5 meters per second, with minimal variation in direction and speed — the primary reason for selecting this location. Unlike wind and solar, ocean currents are virtually unaffected by seasons and weather, providing stable power output.

The OceanCurrent array consists of 48 turbines with total installed capacity of 120MW. During the six-month test period, the capacity factor reached 78% — meaning actual generation was 78% of theoretical maximum. For comparison, onshore wind typically achieves 25-35% and solar 15-25%.

Innovation in Subsea Maintenance

The biggest challenge of ocean current power is maintenance. Inspecting subsea equipment requires specialized diving vessels and underwater robots, with costs far exceeding onshore equipment maintenance.

Simec Atlantis developed an autonomous underwater maintenance robot system called TurtleBot. These robots can autonomously inspect turbine conditions on the seabed, clean marine organisms attached to blades, and automatically alert when anomalies are detected. Professional vessels are only needed for major component replacements.

TurtleBot deployment reduced maintenance costs by approximately 60%. During the six-month test period, only 2 failures required manual intervention.

Economics and Expansion Plans

OceanCurrent's levelized cost of electricity is approximately $0.08/kWh, higher than onshore wind at $0.04 and solar at $0.03, but lower than offshore wind at $0.12. Simec Atlantis expects costs to drop to $0.05/kWh by 2032 as scale effects and technology mature.

The company has secured permits for three new projects in the Taiwan Strait, South Korea's Jeju Island, and Scotland's海域, planning to reach 1.2GW total installed capacity by 2031.

Environmental Impact

The impact of ocean current turbines on marine ecology is a focus for environmental groups. Six months of monitoring data shows the turbines' low rotational speed design (8-12 RPM) allows marine life to easily avoid blades. No marine mammal or large fish casualties were observed during the monitoring period.

However, turbine foundations' disturbance of seabed sediments may affect benthic communities. Simec Atlantis is collaborating with marine biologists to assess long-term impacts.