A union survey of TasNetworks staff has shed light on issues of morale and bullying.

TasNetworks is the result of a restructure of Tasmania’s energy sector last year.

The shake-up saw the electricity distribution business of Tasmania's only electricity retailer - Aurora Energy - merged with the government-owned transmission company Transend.

Reports say that concerns were first raised by staff at the new firm, leading the Communications, Electrical and Plumbing Union and Professionals Australia to launch a review.

They spoke to more than 250 people, and found 70 per cent of staff said there was a bullying culture within the organisation.

Around 43 per cent agrees that the bullying culture driven by senior management was ‘subtle’, while 27 per cent “strongly agree”.

Forty-one per cent said morale was “poor”, but 37 per cent rated it “extremely poor”.

Less than five per cent thought morale was “good’.

Professionals Australia rep Luke Crowley told the ABC that it was concerning.

“We had not really understood how deep the feeling went or how broad that the concerns were about the morale issues so it's taken us a bit by surprise and [we are] very concerned,'” he said.

“One of the most concerning statistics to come out of the survey was I think almost 86 per cent of people felt that morale had actually decreased in the last year and I would say that you would have to act very swiftly to avoid a really detrimental culture settling in.”

Just 23 per cent of TasNetworks staff reported feeling valued.

Twenty-three per cent believed the company was enforcing its Occupational Health and Safety policies to minimise safety incidents, while 41 per cent claimed OHS is being used as a tool for discipline.

TasNetworks issued a statement saying the health, safety and well-being of their employees was its priority.

TasNetworks CEO Lance Balcombe reportedly sent a letter to employees last week, saying “we intend to work hard so that health and safety remains our top priority”.

He urged staff to “speak directly with their leader if they have any issues at any time”.

Unions say they want an urgent meeting with TasNetworks.