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TXNM was founded in 1917 as the Albuquerque Gas and Electric Company. TXNM sold the gas part of the business to Southern Union Gas Company of Dallas in 1949. These sold portions became the Gas Company of New Mexico. In 1985, however, PNM reacquired the Gas Company of New Mexico after Southern Union Gas Company reached a settlement stemming from federal antitrust litigation. In 1994, both electric and gas operations began serving customers as PNM.
In May 2003, TXNM Energy' utility subsidiary, PNM, was recognized by the American Wind Energy Association's Utility Leadership Award for PNM's role in the creation of the New Mexico Wind Energy Center. The award was presented at the National Wind Energy Conference in Austin, Texas.
In 2008, PNM sold New Mexico Gas to Continental Energy, a company backed by the private equity firm Lindsay Goldberg. It was later acquired by TECO Energy. It will soon become a division of Halifax, Canada -based Emera when its acquisition of TECO Energy closes by mid-2016.
On October 21, 2020, the company announced a strategic merger with Avangrid, a subsidiary of Iberdrola.