Shore power — plugging a berthed ship into the grid so it can switch its engines off — is regularly floated as the green upgrade New Zealand's cruise ports need. The most thorough New Zealand study of it reached an awkward conclusion: for cruise specifically, don't rush.
The finding
The Port Electrification Options Assessment (February 2024, for EECA) assessed all 13 major New Zealand ports. Two facts stand out. First, no New Zealand port has shore power installed today, and no major shipping currently receives it. Second — and this is the uncomfortable one — the assessment found cruise ships are "hypothetically the least beneficial class for shore power." Seasonal visits, short berthing windows and low total energy against a very high peak demand (10–40 MVA per port, two to three times other vessel classes) make cruise a poor early candidate.
The economics
Cost runs to "multiple tens of millions of dollars" for single-ship capability, and the report notes that port inquiries "stall when indications of capital cost have been received." No port-specific recommendation to proceed was made. That's not an anti-environment finding; it's an engineering-and-economics one.
The irony worth naming
Cruise lines showed the strongest interest of any vessel class in shore power — and the numbers still don't support building it for them first. Meanwhile the fleet is decarbonising by another route: 57% of the current global orderbook has multi-fuel capability, so onboard solutions are advancing in parallel with, and partly ahead of, shoreside ones.
What it means for the port plan
A credible 2036 port network doesn't promise shore power at every cruise berth by a headline date. It puts capital where the assessment says it earns a return, and it's honest that cruise-specific shore power is a weak early candidate on the published evidence. Planning around aspiration instead of the assessment is how ports end up committing to the wrong thing — the same trap as citing a ten-year-old infrastructure document that's already wrong on three ports. The full port-network paper sets out where the money actually belongs.