Constellation Energy ((CEG) is now a $70 billion generator and marketer of electricity throughout the Mid-Atlantic and Midwest after shares rallied 90% this year.My colleague Ben Rains, who runs the Zacks Alternative Energy Innovators portfolio, bought CEG in late January and his members are enjoying the bulk of those gains as nuclear power regains its stature and attracts capital for long-term energy development projects.In a recent article, Ben described why CEG remains a core holding...Constellation Ener ...