The next stage of the process will see companies able to bid for Government contracts with successful bids from the six going to contract award stage next summer.
Next summer is soon
14 points
Economies of scale in construction and disposal. Ease of transportation. Modularity. Manufacturers can have better oversight of them, and design flaws can be found and fixed easier when you have, say, 1000 production articles as opposed to 4 articles.
Plus, if you put six of them together in a 2x3 configuration, you get a massive power output multiplier (source: Factorio)