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NRG Energy, the world’s No. 3 competitive energy supplier, has acquired a Buffalo-based firm that allows business customers to manage and reduce their energy usage so utilities can maintain the electrical grid at times of peak overall demand.

Princeton-based NRG did not say how much it paid to buy Energy Curtailment Specialists, one of the largest privately owned “demand-response” providers in North America. The firm manages more than 2,000 megawatts of demand response for more than 5,000 customers across the country, helping them reduce energy demand in a way that still boosts profit.

Energy Curtailment will remain based in Western New York, as part of NRG.

“NRG has been on the forefront of giving customers greater choice in how their power is made,” said Jim Steffes, president of NRG Retail Northeast.