A lot of new nuclear power plants can be built on the site of the coal/gas power station they are replacing and can utilize the existing power transmission infrastructure.

That's true, and I think the article's mention of "small modular reactors" would help with that or that investment might already be in consideration of this transmission problem.

I recalled reading about the Westinghouse eVinci – a portable reactor that fits onto a truck.

* https://www.power-eng.com/nuclear/canada-invests-27-million-...

* https://www.westinghousenuclear.com/canada/evinci-micro-reac...