I don't remember the exact figures, but as I recal using New Zealand dollars the Anzacs cost around $470 million each, whereas the offsets of building several Anzac class modules represented 60 percent of the fabrication of the ten ships, about a billion dollars in value... in other words New Zealand broke about even on the Anzac ship project during that time.
Since Australia didn't purchase any Project Protector ships, New Zealand did not do as well, spending $500 million and generating over $100 million of New Zealand value. An order for a third Anzac would probably reveal similar numbers.
The Absalons, I like this ship too. But the Absalons only carry two helicopters; have 240 lane meters of vehicle deck space, any hospital facility will have to use the vehicle deck space, And they cost more than an Anzac, and as I mentioned before, would not have any New Zealand construction. While an Absalon would fit well replacing an Anzac, it will take two to replace the Canterbury.
The figures above might be correct, though I am recalling a different per unit cost for the Anzacs of around $200 mil/per but I do not recall where I saw it, or what the currency was, be it US$, A$, or NZ$...
Regardless, I do not foresee NZ being able to participate in a project like it did with the Anzac again. For one thing IIRC, BAE is shutting down the Whangarei facilities which means NZ will have less industrial capacity to contribute. Secondly, the workshare on the Anzac programme seems to have been disproportionate to the quantity ordered. I do not see Australia, or another country which NZ might try to participate with, allowing that kind of an imbalance.
After all, NZ only ordered 20% of the vessels, yet performed ~60% of the module construction. Granted, NZ does not have the facilities for final assembly, I would still think only 30% or no more than 40% of the modular construction would result in a "fair" division of the programmes construction workshare.
The way I see it, NZ should be starting to think about whatever will be the follow-on to the Anzac frigate now, given that this sort of project is a long lead time. There are four potential paths which I feel NZ can take in acquisition of replacement frigates, these are as follows.
1. Joint programme with Australia for the Anzac follow-on frigate
2. Construction within Oz/NZ of a different frigate design
3. Overseas frigate construction
4. Purchase of second-hand/surplus frigates from another country
The advantages of options #'s 1 & 2 are that NZ might see a return of some of the costs due to industrial participation, however there could be a premium paid in terms of conducting local construction.
For option #2 specifically, the design itself could cost more, as it would likely be an "NZ only" design or variant which means any project risk etc would be NZ's burden. Also, by operating an essentially unique design, there might be issues with other support from the RAN and/or Australian facilities.
Option #3 would likely have the lowest cost in terms of new construction, however NZ might have greater difficulties in getting a ship fitted out to the desired specifications that the RNZN might have. Also, there would likely be little if any NZ workshare or local content.
Option #4 is likely the one with the lowest total acquisition cost, however given that the vessels are second hand, they would likely not have the same operating costs or service life as a newly built ship. Also, NZ would essentially be restricted to whatever was available for sale from other navies which means NZ might find itself without certain capabilities it wants or needs.
It would be interesting to find out what avenues the RNZN is exploring for frigate replacement.
-Cheers