A global shortage of backup generators is causing massive delays in the construction of new data-centers:
"Generator lead time for a nice 2 megawatt diesel engine is now up to a year for one generator," Josh Snowhorn of Terremark said in a panel at the NANOG conference earlier this year. "So we can build all the raised floor we want, and then sit around and wait six months for a generator."
(via Hack the Planet)