I hate how articles talking about renewable energy never take into account the capacity factor of the production. Wind is about 30% or so, so the real average output will be more like 200 MW, unlike a nuclear or other plant with a capacity factor of 90+%. Yet still, they will be compared on their MAX output, not the AVERAGE.

Your facts about the reactors are completely wrong here.

First off, you can use either light or heavy water reactor to make plutonium, it makes little difference except that a short cycle (typical but not necessary of heavy water reactors) makes better plutonium.

Enrichment is necessary for light water but not heavy water, although it can be economically beneficial for a heavy water reactor.

Heavy water reactors are no bigger, except that the capital costs makes large ones more viable.

The biggest reactors in the world are light water.

Also, the first reactors did not use heavy water, they were graphite moderated.

The CANDU was designed with two main differences: Heavy Water Moderator -Lets you use natural uranium -Safer than graphite Pressure Tube Design -To avoid needing heavy manufacturing capabilities -This has nothing to do with ability to use natural uranium The Caladria is indeed big but does not need to be forged in one piece (or be as thick) as it does not have to hold in a significant amount of pressure (unlike the pressure vessel, naturally).