A 90-day consultation period with workers and unions has finished and the company said the site in London Road, Rayleigh, would shut on 25 June. Another 200 jobs will go in IT support and energy services across the UK. The company said it wanted to "streamline" its customer service operations by creating centres of excellence elsewhere in the UK.
The union Unison said this was the third announcement to close a call centre in the area this year.
Regional organiser Phil Green said: "We are asking our lawyers to look at whether E.On have properly consulted with a view to avoiding these redundancies." Mr Green said the union had put forward counter-proposals to keep the call centre in Rayleigh on a smaller scale but he said the company seemed determined to close the site.
A spokesperson for E.On said: "The decision to close the Rayleigh site was not a move that we've taken lightly and we absolutely understand the effect that this decision will have on our colleagues who have been affected. "We'll be continuing to be as supportive as we can during this difficult time and provide help and advice to all colleagues."
E.On has said it will offer relocation packages and hopes some people will take voluntary redundancy.
Unison said only a handful of employees, between 20 and 40, would be able to relocate.
The company currently employs 16,000 people in the UK.<< Archive
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