The Future of Wave and Tidal Energy: Harvesting Clean Power From the World Oceans
Updated September 2, 2026 · 3 min read
- Wave and tidal energy remains a genuinely small sector — global ocean energy capacity was near 530 MW at end of 2025, over 95% of it tidal-range, not wave.
- MeyGen in Scotland is the world’s largest operational tidal-stream array (6 MW, 4 turbines), generating 84+ GWh since 2018.
- Orbital Marine’s O2 device (2 MW, the world’s most powerful tidal stream device by rated capacity) has hit 40%+ capacity factor and 90%+ availability — genuinely strong performance numbers.
- 2022’s Contract for Difference awards gave tidal stream projects the revenue certainty needed to finance the first multi-MW commercial arrays — a real financing breakthrough, not a technology one.
Wave and tidal energy is still a small but maturing sector in 2026 — global ocean energy capacity sits near 530 MW, and more than 95% of that is tidal-range technology, not the wave or tidal-stream projects that get more press attention. Within tidal stream specifically, though, real commercial progress is happening: MeyGen and Orbital Marine’s O2 are both operating with strong performance data.
The Two Leading Projects
| Project | Capacity | Performance |
|---|---|---|
| MeyGen (Scotland, Pentland Firth) | 6 MW (4× 1.5MW turbines) — world’s largest operational tidal-stream array | 84+ GWh generated since 2018; 732 MWh in June 2026 alone |
| Orbital Marine O2 (Orkney, EMEC) | 2 MW — world’s most powerful tidal stream device by rated capacity | 40%+ capacity factor, 90%+ availability |
For comparison, a 40%+ capacity factor is genuinely strong for a renewable source — competitive with or better than typical onshore wind, and far more predictable since tidal cycles are known years in advance, unlike wind or solar.
Why Financing, Not Technology, Was the Real Bottleneck
| Milestone | Significance |
|---|---|
| 2022 Contract for Difference (CfD) awards | Gave tidal stream projects revenue certainty needed to finance first multi-MW commercial arrays |
| MeyGen Phase 2 CfD (28MW, £178.54/MWh) | Target commissioning 2027 |
| MeyGen further CfD rounds (59MW total) | Target commissioning 2027-2029 |
Tidal stream technology has worked at demonstration scale for years — the real unlock was getting governments to guarantee a minimum price per MWh, which finally made the projects bankable at commercial scale.
Why This Sector Stays Small Despite Good Performance
Even with MeyGen and Orbital’s strong capacity factors, wave and tidal energy remains capital-intensive to build (marine construction, corrosion-resistant materials, subsea cabling) and geographically limited to locations with strong, predictable tidal flows — a much smaller subset of coastlines than where solar or wind can be sited. That’s why total global capacity remains in the hundreds of megawatts, not gigawatts, despite the technology working well where it’s deployed.
What to Watch Next
MeyGen’s staged Phase 2 and further CfD-backed expansions (targeting 2027-2029 commissioning) are the clearest near-term growth signal — if those phases deliver on schedule and cost, they’ll be the strongest evidence yet that tidal stream can scale beyond single-digit-megawatt demonstration arrays into genuinely commercial multi-site deployment.
One-Minute Recap
- Global ocean energy capacity: ~530 MW at end of 2025, 95%+ tidal-range.
- MeyGen: 6 MW, world’s largest operational tidal-stream array, 84+ GWh generated since 2018.
- Orbital Marine O2: 2 MW, 40%+ capacity factor, 90%+ availability — strong real-world performance.
- 2022 CfD awards solved the financing bottleneck; MeyGen’s next phases target 2027-2029.
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How big is the wave and tidal energy sector today?
Small but real — global ocean energy capacity was near 530 MW at the end of 2025, with over 95% of that being tidal-range technology rather than wave or tidal-stream projects.
What is the largest operational tidal energy project?
MeyGen in Scotland’s Pentland Firth, with 6 MW total capacity across four 1.5 MW turbines, is the world’s largest operational tidal-stream array, having generated over 84 GWh since 2018.
How well does tidal energy actually perform?
Very well where deployed — Orbital Marine’s O2 device has demonstrated capacity factors above 40% and availability above 90%, competitive with or better than typical onshore wind, and more predictable since tidal cycles are known years in advance.
Why hasn’t tidal energy scaled up faster if it performs well?
High capital costs (marine construction, corrosion-resistant equipment, subsea cabling) and geographic limits to locations with strong tidal flows, plus the sector only recently got the financing certainty (2022 Contract for Difference awards) needed to build commercial-scale arrays.
What role did government contracts play in tidal energy’s growth?
The 2022 Contract for Difference awards guaranteed tidal stream projects a minimum price per MWh, providing the revenue certainty needed to finance the first multi-MW commercial arrays — a financing breakthrough more than a technology one.
What’s next for tidal energy expansion?
MeyGen’s Phase 2 (28MW) and further CfD-backed phases (59MW total) target commissioning between 2027 and 2029, which would be the clearest evidence yet that tidal stream can scale beyond small demonstration arrays.
Sources and Further Reading
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