The West Offaly Power Station in Shannonbridge will be disconnected from the national grid this afternoon.
It and its sister plant in Lanesboro, Co Longford, are being shut down this month -- ending five decades of turf power.
The last trains of peat arrived from the Bord na Mona works in east Galway this week.
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Siptu organiser Willie Noone says many workers there don't even know if they'll have jobs in the new year.
