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Joining fellow web giants Google (s goog) and Facebook (s fb), Microsoft has received tax incentives tied to plans for a $677.6 million data center expansion in West Des Moines, Iowa.

Microsoft (s msft) already has operations in Iowa, and expects construction to begin in late 2013 with a scheduled completion deadline by the end of 2015. Microsoft will receive $20 million in tax credits to create 29 jobs, according to documents filed with the Iowa Economic Development Authority, which approved some tax incentives associated with the expansion on Friday.

Two months ago Facebook announced a $300 million data center in Altoona that also received incentives from the IEDA. At that time Google also announced an expansion of its Council Bluffs, Iowa data center campus.

And for the clean power buffs out there, hoping Microsoft might push the envelope with this expansion, it is making an effort, although not trying to purchase clean power. the company says it will offset the gross carbon emissions from this data center by purchasing an equivalent amount of renewable energy credits.