Union leaders have said closing the Cadent headquarters in Leicestershire would be a hammer blow for workers.
The gas supply company is considering shutting the Hinckley HQ where around 1,000 staff are normally based.
The company has launched a consultation on winding down its office in the town’s Brick Kiln Lane at some point next year.
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Many staff there are already facing redundancy as part of a separate restructuring of the business.
The company is proposing to relocate some staff to its new base at Ansty, near Coventry – around nine miles away –with others working from home.
UNISON East Midlands regional organiser Ed Bratt said: “Some employees may be able to work from home after Brick Kiln Lane closes, but not everyone’s jobs can be done from their living rooms and kitchens.
“Others will have no option but to move to the new site - but it’s not served by public transport and not all staff have their own cars."
He said the news had come as a "bolt from the blue" to staff who were already reeling from job losses announced back in April.
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He said: “Anxiety levels across the workforce have gone through the roof again, as many staff fear that their posts could now go. It’s a hammer blow for this dedicated workforce.
“UNISON will be doing everything it can to protect jobs and livelihoods of staff.
“The unions will be seeking assurance from the company that it will avoid compulsory redundancies and support employees throughout the difficult months ahead.”
The union says it understands the Hinckley base could close in March under the plans.
However, Cadent, the 海角视频’s largest gas distribution firm, said no decisions have been made and no date set.
Dan Adcock, the firm's director of customer experience, confirmed a consultation was underway over moving all staff from Hinckley to a new purpose-built office at Ansty Business Park, near Coventry.
He said: “We are proposing this move because of our updated approach to working more flexibly, where working from home was successfully proven during the pandemic and as a result, this has given us more room at our brand-new building at Ansty.
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“The combination of these two factors has resulted in the proposal being consulted on today.
“This is a continuation of the consultation started in September 2019 for a new purpose-built building, for our three offices at Coventry, Hinckley and Leicester, in which their leases are coming to an end, or the building is no longer fit for purpose.
“This consultation is about relocating to new offices. There are no job losses, as a consequence of this relocation proposal.”
Staff have until midnight on Sunday, July 4 to respond to the proposal.
Cadent says the move does not affect employees at its base in Aylestone Road, Leicester.