Science Friday

Why Hasn’t Wave Energy Gotten Its Sea Legs Yet?

November 1, 2025

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  • The primary challenge in developing wave energy technology is efficiently converting the slow-moving but powerful waves into electricity, a hurdle that requires extensive, difficult, and costly ocean testing. 
  • The PacWave testing facility off the Oregon coast is unique among US wave energy sites due to its advanced grid connectivity infrastructure, allowing developers to test power transmission and performance assessment in a way other facilities currently cannot. 
  • Wave energy is considered a necessary component for a resilient, diverse renewable energy mix, as its consistent availability (waves travel even when local wind is calm) complements variable sources like solar and wind, potentially reducing overall system storage costs. 

Segments

Oregon Wave Energy Test Site
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(00:01:15)
  • Key Takeaway: The PacWave test site off the Oregon coast is a one-by-two-mile area divided into four berths for floating, tethered wave energy devices connected to subsea infrastructure for power and data transmission.
  • Summary: The site allows four different companies to deploy buoys to test wave energy capture. Subsea cables transport generated electricity and performance data back to shore for analysis and grid injection. This infrastructure is crucial because capturing energy from slow-moving waves remains a significant engineering challenge.
Challenges of Ocean Testing
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(00:04:36)
  • Key Takeaway: Testing wave energy technology in the ocean is significantly more difficult than on land due to unpredictability, corrosion from salt, and biofouling.
  • Summary: Unlike wind turbines, wave energy lacks a standardized, refined design model due to limited testing opportunities. Ocean environments present unique hurdles like corrosive salt water and biofouling, where organisms attach to submerged equipment within days. The dedicated testing facility mitigates permitting difficulties associated with ocean deployment.
Funding and Facility Scale
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(00:05:42)
  • Key Takeaway: The $80 million PacWave facility, primarily federally funded, faces risks from clean energy funding cuts, exemplified by one company shutting down after losing guaranteed grant money.
  • Summary: PacWave is rated for 20 megawatts, potentially powering 10,000 to 20,000 homes at maximum capacity, though realistic output will be lower. Its grid connectedness distinguishes it from other US and even major European testing sites like the one in Scotland. Despite funding volatility, three developers are currently signed up to test there.
Wave Energy Potential Use Cases
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(00:09:29)
  • Key Takeaway: Beyond utility-scale power, wave energy is viable for powering remote ocean sensors, providing localized energy for island communities, or directly fueling energy-intensive processes like desalination.
  • Summary: A key advantage of wave energy is its consistency; waves are almost always present because swells travel from distant wind events, unlike solar power which stops at night. Wave energy systems are complementary to solar and wind, enhancing overall grid resilience. A recent agreement with Bonneville Power Administration guarantees a buyer for PacWave’s 20 megawatts, proving grid integration feasibility.
International Wave Energy Efforts
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(00:13:33)
  • Key Takeaway: International efforts, particularly in the UK and Europe, support wave energy research through dedicated programs, though commercialization lags behind offshore wind due to high initial costs.
  • Summary: Entities like Wave Energy Scotland fund research, supporting companies like Sweden’s Core Power planning large arrays. Wave energy and tidal stream are seen as vital for energy mix diversity, reducing the need for excessive energy storage required by intermittent sources alone. The main engineering hurdle globally is designing devices robust enough to survive severe storms while remaining responsive to normal wave action.