Exelon Corporation EXC, a competitive energy provider, delivers electricity and natural gas to customers in central Maryland, northern Illinois and southeastern Pennsylvania through its subsidiaries. The Chicago, IL-based firm operates in 48 states and the District of Columbia of the U.S., and Canada.Exelon’s strategy of matching its load business with generation fleet, addition of renewable and natural gas based power generating units to its portfolio, systematic divestment of non-core assets will drive its performance. In first quarter, Exelon was finally able close the much awaited merger with Pepco Holdings after the necessary approval was provided by the Public Service Commission of the District of Columbia.Estimate Trend & Surprise HistoryInvestors should note that the first quarter Zacks Consensus Estimate for earnings of 66 cents per share gained 1.5% over the last 90 days.Coming to the earnings surprise, Exelon has surpassed the Zacks Consensus Estimate in three of the last four quarters, resulting in a positive average surprise of 8.61%.Zacks Rank: Currently, Exelon has a Zacks Rank#4 (Sell) but that could change following its first quarter 2016 earnings report which has just released. We have highlighted some of the key details from the just-released announcement below:Earnings: Exelon surpassed first quarter earnings estimate. Adjusted earnings per share came in at 68 cents, beating the Zacks Consensus Estimate of 66 cents per share by 3%.Revenue: Revenues of $7,573 million missed the Zacks Consensus Estimate of $9,231 million by 17.8% and also fell from the year-ago level by 14.2%.Key Stats: Exelon was serving nearly 3.95 million customers in first quarter up 1.5% from the year ago level.Check back for our full write up on this EXC earnings report later!Want the latest recommendations from Zacks Investment Research?Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report EXELON CORP (EXC): Free Stock Analysis Report To read this article on Zacks.com click here.