Shore Power for Indian Ports: Can Clean Energy End Diesel Emissions?

Portsmouth International Port has become the first facility in the United Kingdom to deploy a high-voltage, multi-berth shore power system — a technology that lets docked ships plug into grid electricity and switch off their on-board diesel generators entirely. The emissions and fuel-cost savings, in theory, are dramatic: a single large cruise ship idling at berth can burn 20 tonnes of heavy fuel oil per day, releasing sulphur oxides, nitrogen oxides, and particulate matter into densely populated port cities. Portsmouth's system delivers up to 20 megavolt-amperes (MVA) of grid power across multiple berths simultaneously. The catch, however, is adoption: shore power only works if shipowners actually connect. That gap between infrastructure and uptake is a problem India — home to 12 major ports handling over 800 million tonnes of cargo annually, and a government committed to net-zero shipping under the Harit Nauka guidelines — cannot afford to ignore. With India's 500 GW renewable energy target by 2030 reshaping every sector, the country's ports need a shore power strategy, and they need it now.

What Is Shore Power and Why Do Ports Need It?

Shore power — also called cold ironing or Alternative Maritime Power (AMP) — is the practice of supplying docked vessels with electricity from the onshore grid so they can shut down auxiliary diesel engines that would otherwise run continuously throughout a port call. Those auxiliary engines are the primary source of air pollution at any busy harbour. The International Maritime Organization (IMO) estimates that ships at berth account for roughly 70 percent of total port-area air emissions, making them a more significant local pollutant than the vessels' voyage-phase fuel burn. Portsmouth's new system is rated at up to 20 MVA and is capable of serving multiple large vessels simultaneously, a step up from the single-berth pilot installations that have appeared at ports in Los Angeles, Hamburg, and Shanghai. For India, the logic is equally compelling. Jawaharlal Nehru Port (JNPT) in Mumbai, the Mundra Port operated by Adani Ports and SEZ, and Chennai Port handle enormous vessel traffic in cities already breaching WHO air quality limits. Installing high-voltage shore power at these facilities would directly reduce the diesel pollution burden on Mumbai, Navi Mumbai, and Chennai residents living within the airshed of port operations.

The technology itself is mature. High-voltage shore connection (HVSC) standards — IEC/ISO/IEEE 80005-1 — have been internationally harmonised for over a decade. The equipment supply chain includes established players such as ABB, Siemens, and Schneider Electric, all of whom have Indian operations and could localise manufacturing. The real barriers are economic and regulatory, not technical, which is precisely why policy architecture matters more than engineering at this stage of deployment.

Why Aren't Ships Actually Connecting to Shore Power?

The Portsmouth example lays bare a structural problem that mirrors what any early shore power project in India would face: the split incentive. Port authorities invest tens of millions in shore-side infrastructure, but shipowners — who would capture the fuel savings — have no contractual obligation to connect. A large Panamax container vessel calling at a berth for 18 hours could save between USD 8,000 and USD 15,000 in fuel costs by switching to grid power at prevailing industrial electricity tariffs. Yet if the port's electricity price is high, or if a ship's crew is unfamiliar with connection procedures, or if the vessel's on-board switchgear is not certified for the local grid frequency, the captain will simply leave the engines running. In Europe, the EU's FuelEU Maritime Regulation is moving to mandate shore power connection for passenger ships and container vessels at EU ports from 2030, creating the regulatory pressure that voluntary schemes could not. India has no equivalent mandate yet. The Ministry of Ports, Shipping and Waterways released the Harit Nauka guidelines in 2023, which encourage green port infrastructure including shore power, but the framework remains advisory rather than binding. Without a mandatory connection requirement tied to port dues or berthing priority, uptake will remain negligible regardless of how good the hardware is.

Electricity tariff design is the second major obstacle. Industrial grid tariffs at major Indian ports can run to Rs 8–10 per kWh, which, depending on the vessel type and fuel oil price, may offer limited savings over running generators on low-sulphur fuel oil. The solution used in some Californian and Scandinavian ports — offering shore power at a subsidised green tariff, funded partially by port revenue or a national green port levy — has not yet been piloted in India. NTPC Renewable Energy and state utilities in Gujarat and Maharashtra could structure preferential renewable-sourced tariffs for port shore power as a bankable demonstration project, leveraging India's falling solar generation costs, which averaged Rs 2.50–2.75 per kWh at recent SECI auctions.

What This Means for India's Energy Transition

India's maritime sector accounts for approximately 2.5 percent of national greenhouse gas emissions, a share that will grow as trade volumes rise toward the government's target of 10,000 MMTPA port capacity by 2047. Shore power sits at the intersection of two of India's most ambitious clean energy programmes: the 500 GW renewable energy target by 2030, which is generating surplus solar and wind power that needs new demand sinks, and the National Green Hydrogen Mission, which identifies shipping as a priority decarbonisation sector. Electrifying port berths with renewable-sourced grid power is the lowest-hanging fruit on that pathway — it requires no new vessel fuel technology, no hydrogen infrastructure, and no wait for ammonia bunkering supply chains. The Ministry of Ports, Shipping and Waterways, working with MNRE and SECI, could design a Green Port Shore Power Scheme modelled on the PM Surya Ghar framework: capital subsidy for shore-side infrastructure, a preferential renewable tariff for port operators, and a graduated mandatory connection policy starting with government-owned vessel fleets at JNPT, Paradip, and Visakhapatnam.

Watch for the Sagarmala Programme's next project pipeline update, expected in late 2025, which may include dedicated shore power nodes at three to five major ports. If JNPT or Mundra announces a shore power tender in the next 12 months — potentially drawing interest from ABB India or Siemens Energy — it will signal that India is ready to move from advisory guidelines to actual infrastructure. That moment cannot come soon enough for the port-city residents of Mumbai, Chennai, and Visakhapatnam who breathe the consequences of every idling ship.