To deploy 10GbE (10 Gigabit ethernet) for a distance of 10km connecting two control centers, is it safe to assume that G.652 fiber would not be suitable and G.655 fiber (at 1550nm) is required instead?
10GBASE-LR can reach 10 km. It uses 1310 nm wavelength with a total power budget of 9.4 dB. It assumes a maximum attenuation if .4 db/km (OS2).
If you've got OS1 deployed you'll need 10GBASE-ER (1550 nm) instead.
For a new deployment you should aim for the highest quality fiber you can get/budget. Redeployment in a few years will cost much more than the current price difference. With constantly rising requirements, today's 10G line will have to carry 40G or even 100G in a couple of years.