Engie, a subsidiary of international gas supplier Engie Resources, said Monday it will become the retail natural gas supplier for three markets in Massachusetts, Boston Gas, Colonial Gas and Essex Gas.

The company offers fixed and index-plus pricing, as well as firm delivery service to commercial and industrial customers in these service territories.

The new Massachusetts offer includes a standard contract form and payment terms, a choice of dual bills (electricity and/or gas), or a single consolidated bill. The offer also provides a range of usage bandwidth options. The company says transaction term lengths are up to 48 months.

“The state is a $7 billion natural gas market and one of the top five markets in the U.S. for natural gas consumption,” said regional Vice President Tim Hughes.

Engie Resources has already been serving the Massachusetts retail electricity needs of at least 1,600 industrial and commercial customers.

With the addition of natural gas services, Engie Resources said it can offer customers an opportunity to aggregate commodity supply to reduce purchase costs, lower procurement/supplier management costs and streamline compliance.

Engie Resources now operates in seven states. Last September, the company entered the Ohio and Illinois natural gas markets. In December it acquired the Plymouth Rock Energy market in New York. And last month Engie acquired territory in the Pennsylvanian natural gas market.

As of 2017, Engie operated in 70 countries worldwide, with over 24 million international contracts and over 260,000 km of distribution pipelines worldwide. Engie has 48 biogas projects operating in France, and 80 biogas projects in the rest of the world.

Engie today is considered Europe’s leading seller of natural gas storage capacity and is Europe’s no. 1 distributor for natural gas. The company also operates 12 billion cubic meters of storage capacity worldwide. The company operates 33,000 km of transmission pipelines worldwide.

Engie had been one of the world’s largest liquid natural gas (LNG) buyers and sellers until it sold its portfolio two years ago to French supermajor Total SA. Total, now second to Royal Dutch Shell plc as an LNG buyer and seller, recently acquired 16.6% in the Sempra Energy-led Cameron LNG export facility in Louisiana, a 15 million metric ton/year (mmty) project, which began production in May. Total also is a stakeholder in Tellurian Investments Inc., which has proposed the Driftwood LNG terminal proposed in Louisiana.