Investors interested in Utilities stocks should always be looking to find the best-performing companies in the group. Has Ameren (AEE) been one of those stocks this year? A quick glance at the company's year-to-date performance in comparison to the rest of the Utilities sector should help us answer this question.Ameren is one of 105 individual stocks in the Utilities sector. Collectively, these companies sit at #1 in the Zacks Sector Rank. The Zacks Sector Rank considers 16 different groups, measuring the a ...