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Starting Monday, eastern Massachusetts residents might see an unfamiliar name on their electricity or gas bills: Eversource Energy.

That’s the new name of NStar and its parent company, Northeast Utilities, which announced the change in January. Four other Northeast Utilities divisions operating in other parts of New England -- Public Service Co. of New Hampshire, Yankee Gas Services Co., Western Mass. Electric, and Connecticut Light and Power Co. -- also took on the new name, which the company said last week would save costs in the long run. Here's how things will be different for the combined companies’ 3.6 million customers in New England:


- Customers won’t need to change a thing about their bill payment arrangements, said Mike Durand, an Eversource spokesman. Even if their checks or automatic payments are made out to the old utility name, they will continue to go through.

- Bills and envelopes will include the logos of both Eversource Energy and the name of the old division of the company, such as NStar and the Western Massachusetts Electric Co., also called WMECo. Some service vans already have been rebranded with Eversource Energy logos.

- Visitors to NStar.com are automatically redirected to Eversource Energy’s website. Durand said the change would roll out for other sites, like WMECo.com, “over the next week or so.”

- Phone numbers for the utility haven’t changed.

- For anyone who follows the company’s stock, its ticker symbol will change from NU to ES on February 19.

Jack Newsham can be reached at jack.newsham@globe.com. Follow him on Twitter @TheNewsHam.