Workers at Greece’s biggest power company, PPC, have clashed with riot police as they protested against a new property tax in Athens.
Members of the firm’s labour union oppose PPC being tasked with collecting the tax through Greeks’ electricity bills.
Athens police said 15 arrests were made.
Unions have vowed to fight austerity measures agreed with the country’s international creditors.
Greece requested an initial rescue package in May last year.
It needs an eight-billion-euro instalment before Christmas or the state will run out of money.
The new government, with an unelected former central banker at the helm, is still negotiating the details of a second bailout worth one hundred and thirty billion euros.
New taxes spark more riots in Greece