NorthWestern Energy to buy 24 MW wind project from Invenergy Wind

The project is to be built on a portion of Invenergy's proposed 200 MW Big Otter Wind Energy Project site near Belt, Montana

Butte, Mont., January 7, 2011 — NorthWestern Energy has signed a memorandum of understanding to purchase a 24-MW wind project in north central Montana to be developed and constructed by Invenergy Wind Development Montana, LLC, a unit of Invenergy Wind.

The project, which was submitted to NorthWestern in response to a 2009 community renewable resource solicitation, is consistent with recent Montana legislation that provides for the reintegration of the utility.

The project is to be built on a portion of Invenergy's proposed 200 MW Big Otter Wind Energy Project site near Belt, Montana.

It is intended to be placed into the Montana utility's rate base, with both the energy and associated renewable energy credits used to meet future renewable portfolio standard obligations.

Execution of a definitive agreement is expected in the first quarter of 2011. Submission of an application for pre-approval by the Montana Public Service Commission would follow, with an anticipated decision in early 2012. Construction would commence upon a favorable ruling, with commercial operation projected to begin by the end of 2012.

Invenergy also is the owner and operator of the Judith Gap Wind Energy Center in Harlowton, Montana.

NorthWestern Energy provides electricity and natural gas in the Upper Midwest and Northwest, serving about 661,000 customers in Montana, South Dakota and Nebraska.

Invenergy and its affiliated companies develop, own and operate large-scale renewable and other clean energy generation facilities in North America and Europe. Invenergy's home office is located in Chicago and it has regional development offices throughout the U.S. and in Canada and Europe.

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