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CAPITALIZATION	6 Months Ended
CAPITALIZATION	Jun. 30, 2011
CAPITALIZATION [Abstract]
CAPITALIZATION	(B) CAPITALIZATION Common Stock UIL Holdings had 50,542,709 shares of its common stock, no par value, outstanding at June 30, 2011. Long-Term Debt In February 2011, UIL Holdings repaid, upon maturity, the outstanding balances of its 7.23% Series A Senior Notes totaling $4.3 million and its 7.38% Series B Senior Notes totaling $45 million. In May 2011, Berkshire repaid, upon maturity, the outstanding balance of its 4.76% unsecured notes totaling $3.0 million. As of June 30, 2011, borrowings under the EBL used by UI to fund its commitments as a 50-50 joint venturer in GenConn were approximately $63 million. This amount was repaid in July 2011 upon maturity.