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To pay less for megawatts/hour of electricity and gas, they come together to buy in bulk at a price monitored year-round like milk on the stove. And when the price is right: banco! Nearly 300 municipalities, as well as 59 inter-municipal syndicates, communities of municipalities and agglomerations, and even a public HLM office — Conflucences Habitat — participate in group energy purchases, set up by the Syndicat des Energies de Seine-et -Marne (SDESM) over the period 2021-2024.