It also doubles your likelihood of having at least one working generator in the presence of failures. Depending on how many of your loads are critical, it might

It also doubles your likelihood of having at least one working generator in the presence of failures. Depending on how many of your loads are critical, it might be a better bet to have two in parallel. Best case you can run more, worst case you can run the essentials just like now. Also it might be a cheaper upgrade path. Instead of throwing away or reselling the existing smaller generator to buy a larger one, just add another of the same thing you already have to your system. Finally, you could have three smaller generators and get N+1 redundancy for cheaper than two larger generators.