Alliant Energy, Interstate Power and Wisconsin Power and Light closed a new five-year master credit agreement with Wells Fargo as administrative agent. The agreement provides for a combined $1 billion revolving credit facility among the three borrowers.

According to a related 8-K filing, the credit facility includes a $100 million letter of credit subfacility and a $50 million swing line subfacility, available to all borrowers. The facility includes an accordion feature that will allow the units to request an increase up to an additional $300 million.