Long Term Debt	6 Months Ended
Jun. 30, 2012
Long-term Debt, Unclassified [Abstract]
LONG TERM DEBT	LONG-TERM DEBT In January 2011, we issued a total of $420 million of long-term debt ($205 million aggregate principal amount of 4.673% Series B Senior Notes due January 19, 2031 and $215 million aggregate principal amount of 5.848% Series B Senior Notes due January 19, 2041) and used the net proceeds to repay short-term debt incurred to finance the construction of Oak Creek expansion Unit 2 (OC 2) and for other corporate purposes. The Series B Senior Notes are secured by a collateral assignment of the leases between Elm Road Generating Station Supercritical, LLC (ERGSS) and Wisconsin Electric related to OC 2. On April 1, 2011, we used cash and short-term borrowings to retire $450 million of long-term debt that matured. As of June 30, 2012, we were in compliance with all financial covenants.

Long Term Debt

6 Months Ended

Jun. 30, 2012

Long-term Debt, Unclassified [Abstract]

LONG-TERM DEBT

In January 2011, we issued a total of $420 million of long-term debt ($205 million aggregate principal amount of 4.673% Series B Senior Notes due January 19, 2031 and $215 million aggregate principal amount of 5.848% Series B Senior Notes due January 19, 2041) and used the net proceeds to repay short-term debt incurred to finance the construction of Oak Creek expansion Unit 2 (OC 2) and for other corporate purposes. The Series B Senior Notes are secured by a collateral assignment of the leases between Elm Road Generating Station Supercritical, LLC (ERGSS) and Wisconsin Electric related to OC 2.

On April 1, 2011, we used cash and short-term borrowings to retire $450 million of long-term debt that matured.

As of June 30, 2012, we were in compliance with all financial covenants.