Consolidated Edison closed walk-in centers, suspended meter readings and limited work on major construction projects in New York on Sunday after contract talks between the utility and its unionized workers broke down in the middle of a wave of extremely hot weather.

Negotiations stopped just before 2 a.m. Sunday, a couple of hours after the existing contract expired. The impasse came as New York braced for more high temperatures that will increase demand for air conditioning among the utility’s 3.2 million customers.

On Sunday morning, police set up barricades in front of Con Ed’s headquarters near Manhattan’s Union Square.

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