Constellation Energy is getting mixed reviews. According to M.A. Energy Ratings, customers are generally satisfied with its plans, pricing (3.1 stars), and customer service (3 stars). However, many have expressed their dissatisfaction on platforms such as Yelp and ConsumerAffairs. Most of Yelp's reviews for Constellation Energy are one-star, with many recent complaints concerning service delivery. Constellation salespeople (according to many reviews) ask to see businesses' utility bills. As with any energy service provider, always look for hidden costs and watch out for unreasonable deposit amounts.