The building I work in (which is not a CO, but does house a lot of rather important equipment), has two 1.5MW CAT diesel gensets.
They are MASSIVE gensets and very impressive to see/hear them start up.
Total load is just under 1MW, but there are two gensets for redundancy in case one fails to start.
Lightweight...
Largest complex I maintain regularly has 6 1.5 MW and 2 2 MW generators, and I was called in on an emergency to another building of ours with 3 5MW turbines... They are impressive as it gets at startup...
Turbines are certainly the coolest sounding getsets, period. We looked at some but decided against it because there was concern about local service and parts. -- I do not, have not, and will not work for AT&T/Comcast/Verizon/Charter or similar sized company.
Turbines are awesome, but you are absolutely right about service and parts... As well as being tied to a specific vendor - there's 100's of companies that can service your average generator - turbines mean dealing with the company that built it almost exclusively....