How much coastal energy can offshore wind realistically supply?
Offshore wind can supply a very large fraction of a coastal region's electricity, but the exact share depends on local wind resources and infrastructure. In Morocco, a study identified three optimal offshore wind locations near Dakhla, Boujdour, and Essaouira that together could supply 21.8% of the country's entire 2022 energy needs—a substantial contribution from just a few sites [7]. In Algeria's Mostaganem region, a single 500 MW offshore wind farm using 33 large turbines (15 MW each) is projected to generate 1,361 GWh of electricity per year, enough to power hundreds of thousands of homes, plus produce 28,571 tons of green hydrogen annually [3]. These examples show that offshore wind can cover a meaningful portion of coastal demand, but not 100% on its own.
What happens when the wind doesn't blow? Storage and hydrogen fill the gaps.
Because offshore wind is intermittent (it doesn't blow constantly), meeting all coastal energy needs requires pairing wind farms with energy storage and hydrogen production. A promising solution is Buoyancy Energy Storage Technology (BEST), which stores energy in the deep ocean by raising and lowering buoyant chambers—costing an estimated 50 to 100 USD per kWh of stored energy and capable of providing weekly storage cycles, far longer than typical batteries [1]. Another approach is to use offshore wind to produce green hydrogen via electrolysis, which can be stored and used later for power or as fuel. In the Algerian study, the same 500 MW wind farm could produce 28,571 tons of hydrogen per year at a cost of $2.12 per kg, making it a viable energy carrier [3]. A joint scheduling method that coordinates offshore wind, hydrogen storage, and the coastal grid can balance supply and demand while reducing fatigue on wind turbines, ensuring reliable power delivery [5].
What are the biggest challenges and risks for offshore wind?
Offshore wind faces two major hurdles: extreme weather from climate change and environmental impacts. A 2025 study using 83 years of wind data found that extreme wind speeds (the kind used to design turbines) have increased across 63% of global coastal regions, and over 40% of existing and planned wind farms in Asia and Europe have already experienced winds exceeding the design limits of standard turbines [2]. This means turbines must be built stronger, raising costs. On the environmental side, a global life-cycle assessment projected that offshore wind's impacts—including climate change, marine ecotoxicity, and metal depletion—will drop by about 20% per MWh between 2020 and 2040 as technology improves, but the industry still requires large amounts of steel and rare metals [4]. Additionally, the complex ocean environment makes maintenance harder and more expensive than onshore wind, demanding smarter, automated operation and maintenance technologies [6].
Sources used in this answer
Buoyancy Energy Storage Technology: An energy storage solution for islands, coastal regions, offshore wind power and hydrogen compression
Buoyancy Energy Storage Technology (BEST) can store energy in the deep ocean at 50–100 USD/kWh and 4,000–8,000 USD/kW, providing weekly storage cycles and also compressing hydrogen.
Increasing extreme winds challenge offshore wind energy resilience
Extreme wind speeds critical for turbine design have increased across 63% of global coastal regions from 1940–2023, and over 40% of offshore wind farms in Asia and Europe have experienced winds exceeding Class III turbine limits (37.5 m/s).
Assessing offshore wind plants for energy and green hydrogen production: A case study in the Mostaganem coastal region, Algeria
A 500 MW offshore wind farm in Mostaganem, Algeria could generate 1,361 GWh/year of electricity at $0.89/kWh and produce 28,571 tons of green hydrogen at $2.12/kg, cutting CO₂ emissions by 595,450 tons/year.
Environmental Impacts of Global Offshore Wind Energy Development until 2040.
Global offshore wind environmental impacts (climate change, marine ecotoxicity, metal depletion) are projected to decrease by ~20% per MWh from 2020 to 2040 due to larger turbines, longer lifetimes, and innovation.
Joint Scheduling Method for Offshore Wind-hydrogen and Coastal Energy System
A joint scheduling method for offshore wind-hydrogen systems and coastal grids can balance power supply and reduce wind farm fatigue loads, optimizing costs and energy use.
Overview of Offshore Wind Power Technologies
Offshore wind faces complex internal flow dynamics and high maintenance costs, requiring smarter operation and control technologies for large-scale development.
The offshore wind energy potential of Morocco: Optimal locations, cost analysis, and socioenvironmental examination.
Three optimal offshore wind locations in Morocco (near Dakhla, Boujdour, and Essaouira) could supply 21.8% of the country's current energy needs, with payback periods of 14, 13, and 18 years respectively.