UPDATE: Nearly 1,400 to be without power until Saturday morning

Alliant Energy is the parent company of two public utility companies--Interstate Power and Light Company (IPL) and Wisconsin Power and Light Company (WPL)--and of Alliant Energy Resources, Inc. (AER), the parent company of Alliant Energy's non-regulated operations. (PRNewsFoto/ALLIANT ENERGY CORPORATION)
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CEDAR RAPIDS, Iowa (KCRG) -- Alliant Energy says a failed transformer at a substation is to blame for a power outage in northeast Iowa.

The company's website says 1,391 customers are expected to be without power until 5 a.m. Saturday morning while the issue us fixed.

The website says the outage impacts 1,189 customers in Winneshiek County, 188 customers in Howard County and 14 customers in Chickasaw County.

A spokesperson says they do not yet know why the transformer failed.
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Nearly 1,800 Alliant Energy customers in northeast Iowa are without power.

According to the company's website, 1,588 customers in Winneshiek County, 188 customers in Howard County, 78 customers in Fayette County and 14 customers in Chickasaw County are impacted.

The company expects customers to be back on by 3 p.m. Friday afternoon, but they don't yet know what is causing the outage.

Stay with KCRG-TV9 for updates as they become available.