I just finished watching the official announcement from Microsoft - saying that the new (~$500 million) data center will be in West Des Moines. The location cited, is just down the road from a new $300 million campus that Wells Fargo built. It is a large plot of land with plenty of room for expansion or other potential uses for renewable energy sources. I also noted that the location is near the railroad -- to, oh I don't know.....bring in containers! The red tape was rolled out as Senators, the Governor and Mayor were all at the announcement. Michael Manos from Microsoft was there as well.
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As DatacenterKnowledge points out, Iowa has had a lot of data center activity recently, and I certainly think there is more to come. A source of mine indicates that there is another big player bringing a data center to Iowa, more North and East from where Microsoft is at - but I couldn't squeeze any more details out of him (but I'm still trying).