This post is part of a special annual report -- Top Stock Picks '09 -- in which TheStockAdvisors.com asked 75 leading newsletter advisors to select their favorite investment for the new year.

Roger Conrad, the advisory industry's leading authority on the utility sector, looks to American Water Works (NYSE: AWK) as his favorite investment idea for the coming year.

In The Utility Forecaster, he notes, "We now have the opportunity to buy America's premier water utility franchise at a discount to book value." Here, he explains the situation and his bullish outlook.

"In early 2003, Germany's RWE paid a hefty premium for American Water Works. Five years later in April 2008, RWE's new management took a $1 billion write-off to unload the company as an independent company in the U.S.

"As a result, we now have the opportunity to re-enter America's premier water utility franchise at a discount to book value.

"American Water has written off hundreds of millions in good will and overhauled oversight practices that had gone soft under RWE. But with third-quarter earnings surging 11% on a 6.2% revenue jump -- and more the same expected into 2009 -- its fortunes are building again.