had been powering
Past perfect progressiveconjugation ofpower.There are other translations for this conjugation.

power

A gold mine that lacked access to the grid had been powering their operations for the past couple of years with just two generators.
Una mina de oro que no contaba con acceso a la red eléctrica local había estado suministrando energía a sus propias operaciones, con solo dos generadores durante los últimos dos años.
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