The country's dominant electric utility, Public Power Corporation SA (PPC.AT), Tuesday warned of a "significant" risk to the country's power supply due to strike action by power sector workers.
According to a statement, PPC said that as of early Tuesday, a total of 11 power plants with a combined capacity of 2,775 megawatts had been shut down due to the strike.
In addition, strike action at the company's mines had raised the risk of interruptions in fuel supply to the power plants still in operation.
At the same time, three further power plants, with a combined capacity of 900 megawatts remained out of service due to scheduled maintenance.
"Given the especially large number of electric power plants out of service, there is a significantly increased risk today (Tuesday) to the stability of power supply system of the country," PPC said.
"If this situation continues, this will result in unavoidable and rolling power cuts to the company's clients," it added.
PPC workers Tuesday were staging the second of four rolling 24-hour strikes to protest against government plans to reform the country's pension system. Those reform plans are expected to be introduced in parliament in the near future, possibly as soon as next week.
On Monday, the first of the PPC union strikes led to the shutdown of some six plants, prompting the utility to issue a warning of potential blackouts. However, no power disruptions were reported.
In its statement, PPC called on consumers, including households, businesses and farmers, to reduce their power consumption.
Separately, a strike by central bank workers Tuesday - also over pension reform - prompted the Athens stock exchange (EXAE.AT) to cancel Tuesday's trading session. The ASE canceled the session over fears that the central bank would not be able to execute clearing and settlement transactions for the Athens bourse.