Power station workers in North Wales have voted for strike action in a row over pay.
Gwynedd pumped storage sites Dinorwig Power Station and Ffestiniog Power Station employ around 125 workers in Llanberis and Blaenau Ffestiniog.
Now Unite members, which number more than 80 across the First Hydro sites, have voted for industrial action.
This follows months of negotiations over pay.
In the ballot 97 per cent of members voted in favour of strike action and 98.6 per cent voted in favour of action short of a strike.
A last ditch meeting will now take place in January with ACAS in a bid to resolve the issue before workers implement any action.
Daryl Williams, Unite regional officer, said: “This ballot result clearly shows that our members' patience with their employer has completely run out.
"First Hydro must now recognise the seriousness of the situation and negotiate a fair pay settlement. If this doesn’t materialise soon we will be announcing dates for industrial action.
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"The company has so far failed to recognise that our members are determined to reach a fair pay settlement. The management approach to 2019 pay talks is turning into an industrial relations disaster that can only deepen if our members are forced to take action.
"First Hydro can afford to offer a fair deal. The company is doing well financially and has recently received millions of pounds in capacity market payments.
"The company is also making investments for the future but Unite will not accept that the investment should happen at our members' expense through below inflation pay offers."
A First Hydro Company spokesman said: "We very much regret that employees have voted to pursue industrial action.
"We are hopeful that the dispute can be resolved without the need for industrial action. Unite have been invited to further negotiations, with the assistance of ACAS, in order to find a resolution."