Shore power is easy to describe and difficult to deliver. A vessel at berth needs electricity for onboard systems. The port needs a compatible connection, enough capacity and a safe way to transfer that supply.
The problem reaches beyond the ship. A terminal may be electrifying cranes and other equipment at the same time. Those loads compete for the capacity already available at the site.
Different rules have different scope
FuelEU Maritime began applying in 2025. It limits the lifecycle greenhouse-gas intensity of energy used by covered ships. Its shore-power obligations for passenger and container ships start in 2030 at specified ports, with broader coverage from 2035. Vessel, port and exemption conditions matter. European Commission overview.
California’s At Berth Regulation addresses emissions from covered ocean-going vessels at berth. Compliance can involve shore power or approved alternatives, with requirements and exceptions defined by the regulation. A universal daily fine does not describe every vessel visit. CARB guidance.
The infrastructure reaches beyond the plug
Installing shore power requires electrical distribution, transformers, connection equipment, protection and controls. The design must account for the vessels using the berth and the power quality they require.
Then there is the civil work: cables along the dock, connection points, tidal variation, salt exposure and vessel movement. The cost and schedule depend on the port’s existing infrastructure and the scope of the upgrade.
Port equipment adds another demand profile. Crane loads, vessel connections and other terminal operations need to be assessed together, including which loads operate at the same time.
Start with the capacity already available
The useful first step is a site power plan: available grid capacity, expected vessel demand, terminal loads and expansion timing. The utility’s actual connection offer matters more than a general queue estimate. See dated grid-connection evidence.
That plan can compare a utility upgrade, storage and local generation. Each option still needs the appropriate electrical, environmental and safety review. On-site generation by itself does not establish compliance with a shore-power regulation.
Where DOR could fit
Immedia is developing the DOR as a compact, modular source of on-site power. Ports are a potential expansion application: selected shore-power or crane loads could be evaluated as part of an engineered configuration.
A port-scale array requires detailed work on power quality, controls, redundancy, fuel, emissions, permitting, interconnection and berth integration. Unit count and suitability cannot be inferred from nameplate output alone.
If your port’s electrification plan is constrained by available capacity, talk with us about the site requirements.