GlossaryEN1 min readUpdated: Jun 18, 2026
Shore power supply in the port
Shore power supply – commonly known as "cold ironing" or "onshore power supply (OPS)" – is port infrastructure that delivers grid electricity to berthed vessels, enabling them to switch off their auxiliary diesel generators.
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Source: https://www.porttechnology.org/news/shore-power-supply/
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Shore power supply – commonly known as "cold ironing" or "onshore power supply (OPS)" – is port infrastructure that delivers grid electricity to berthed vessels, enabling them to switch off their auxiliary diesel generators. The technology significantly cuts exhaust emissions, noise, and fuel burn during port calls, making it particularly relevant at ports located near residential areas. Carriers pay a connection charge plus consumption costs, which are typically outweighed by fuel savings on longer stays. The term "cold ironing" originates from the historic practice of allowing a ship's engine and exhaust systems to go cold while in port. Shore power must not be confused with floating power barges, which generate electricity independently rather than drawing from the shoreside grid.
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