Berth Demand, Utility Service, Transformer Capacity, N-1 Margin, Cable Ampacity, Voltage Drop & Shore Connection Bottleneck

Port Shore Power Grid, Transformer & Cable Capacity Tool

Screen whether a port shore-power system can carry the simultaneous vessel load from the utility interface through transformers to the final shore-to-ship cable circuits. Simple mode sizes aggregate MW/MVA and per-berth cable capacity. Advanced mode adds berth-by-berth loads, transformer groups, utility-service limits, transformer N-1, cable derating and voltage-drop screening.

Data type
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Need utility, transformer N-1 and cable voltage-drop detail? Click Advanced above.Advanced lets each berth have its own ship demand, PF, cable circuits, ampacity, derating, length and conductor R/X, while transformer groups are modeled independently.

Fast Port Shore-Power Capacity Screen

Simple mode assumes the same berth demand, PF and cable arrangement at every simultaneous berth. Use Advanced for mixed vessel/berth types.

MW per occupied berth.
% applied to aggregate berth MW.
%.
kV line-to-line.
MVA after any intended derating.
% of available transformer MVA.
A per circuit after intended cable derating.

Port Grid & Planning Basis

kV line-to-line.
MVA available to shore-power system.
%.
% after berth demand/diversity.
% of derated online capacity.
% at modeled berth peak.
% added to aggregate shore-load MVA for shore-side auxiliaries/loss allowance.

Berth / Ship Load Register

Cable ampacity is compared against actual modeled current at each berth. Voltage drop uses the entered per-circuit conductor R/X, circuit length and current split across parallel circuits.

Berth / ship typeShip MWDemand factor %PFCable circuitsAmpacity A / circuitCable derating %One-way length mR Ω/kmX Ω/km

Transformer Group Register

Normal capacity uses normally-online transformers only. N-1 removes the single largest derated transformer unit that is online.

Transformer groupInstalled qtyNormally onlineRating MVA / unitAvailable capacity %Efficiency %

Shore-Power Readiness

Shore-power planning screen only: this tool does not replace the utility interconnection study, short-circuit/protection/earthing study, transformer thermal study, cable ampacity study, harmonic/power-quality study, frequency-conversion design, ship-interface assessment or IEC/IEEE 80005 compliance review. Voltage-drop and capacity outputs depend on the user-entered design basis.
Shore-connection context: IEC/IEEE 80005-1:2019 with amendments covers high-voltage shore connection systems and is expected to have practical application for ships requiring 1 MVA or more or ships with a high-voltage main supply. IEC/IEEE 80005-3:2025 covers low-voltage shore connection systems for ships requiring up to 1 MVA, including shore-side connections, transformers/reactors, converters, protection, controls and interlocking. Actual projects can also be subject to flag, class, utility, port and national requirements. IEC/IEEE 80005-1 Consolidated · IEC/IEEE 80005-3:2025 · DNV Rules & Standards
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