Calling Constellation Energy really isn't a successful endeavor unless you're within normal business hours. When I dialed this number, I was immediately asked if I was a customer in New York or any other location, and I responded by selecting any other location.
However, this choice didn't end up mattering, as the system said that it was past business hours and it couldn't offer any help with my issues. The system told me that I could leave a message for someone, and whoever answered it would give me a call back whenever they got it and had time to return my calls.
At that point, the system gave me the beep to leave a message, and I hung up at this point because I couldn't get anything else out of the call.
On one hand, there are some positives here, namely that the automated system doesn't waste time trying to string along the customer. It simply tells them that they'll have to try the call again at another time when the phone lines are open. If you know that you won't be able to provide assistance to the customer, it's best to minimize their wait times so that they can focus on other things.
On the other, not even having the option to get help from the automated system is a major drawback. These days, most people are used to getting assistance from an automated system for at least part of their phone calls, and AI like this that makes people's lives better is encouraged rather than condemned. Setting up an automated system that can at least provide some helpful details, such as reporting an outtage or checking your bill, would go a long way toward making this number helpful for both new and experienced customers.
A search of this phone number shows that it is still in use for customers in Illinois, so there really isn't a reason that the number cannot be used outside of normal business hours. For a company like this, where energy outages can happen at any time, it's even more important to give customers a way to reach you reliably. This number might offer the ability to leave a phone message, but with fewer people bothering to check their voicemail compared to just a decade ago, phone messages can seem to be easy to ignore or get lost in the shuffle.
Based off all of this information, I would use this number only if it were within certain hours and I could be sure I could get someone on the line. As it is, this number would be hit or miss, because if nobody's around to assist, you won't be able to get any help from the automated system.