Onshore vs Offshore Wind Energy: Cost, Capacity Factor & Deployment Compared
Last updated: 2026-02-28
Wind energy supplied over 10% of global electricity in 2025, with approximately 1,000 GW of installed capacity. Onshore wind dominates with 93% of installations, but offshore wind is the fastest-growing segment, with capacity projected to reach 380 GW by 2032.
The choice between onshore and offshore wind involves trade-offs across cost, resource quality, land use, transmission requirements, and community acceptance. Floating offshore wind technology is emerging as a third category that could unlock deep-water sites previously unreachable.
This comparison helps energy planners, developers, and investors evaluate wind deployment strategies for specific markets and contexts.
| Metric | Onshore Wind | Offshore Wind | Notes |
|---|---|---|---|
| LCOE (2026) | $25–50/MWh | $55–100/MWh | Onshore is cheapest new electricity in many markets |
| Capacity Factor | 25–45% | 40–55% | Offshore benefits from stronger, steadier winds |
| Turbine Size | 3–7 MW | 12–18 MW (growing to 20+) | Offshore turbines are world's largest machines |
| Capital Cost ($/kW) | $1,100–1,600 | $2,500–4,500 | Offshore: 2–3× higher upfront investment |
| Permitting Timeline | 2–5 years | 5–10 years | Offshore permitting involves maritime authorities |
| Land/Sea Use | 1–2 acres/MW (compatible with farming) | No land use; maritime spatial planning | Onshore turbines coexist with agriculture |
| Transmission Requirements | Moderate (onshore grid connection) | Major (subsea cables, onshore landing) | Offshore transmission adds 20–30% to project cost |
| Community Acceptance | Variable (visual/noise concerns) | Generally higher (out of sight) | Onshore faces increasing community opposition |
| O&M Cost ($/MWh) | $8–15/MWh | $20–40/MWh | Offshore maintenance requires vessels/helicopters |
| Global Pipeline (2026) | 350+ GW under development | 500+ GW under development | Offshore pipeline exceeds onshore by volume |
Bottom Line
Onshore wind remains the lowest-cost option and should be prioritized where land availability and community acceptance allow. Offshore wind is essential for markets with limited land (UK, Japan, densely populated coastal areas) and offers superior capacity factors that complement solar generation profiles. Floating offshore wind will unlock new markets post-2028. Most national energy strategies need both onshore and offshore wind to meet decarbonization targets.
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