Government subsidies often do lower prices. Looking, it seems that the actual operating prices are pretty opaque, couple of relevant paragraphs from wiki,
Électricité de France (EDF) – the country's main electricity generation and distribution company – manages the country's nuclear power plants.[62] In 2007 EDF was substantially owned by the French government, with around 85% of EDF shares in government hands.[63] 78.9% of Areva shares are owned by the French public sector company CEA and are therefore in public ownership. EDF remains heavily in debt. Its profitability suffered during the recession which began in 2008. It made €3.9 billion in 2009, which fell to €1.02 billion in 2010, with provisions set aside amounting to €2.9 billion.[citation needed] The Nuclear industry has been accused of significant cost overruns and failing to cover the total costs of operation, including waste management and decommissioning.[64][full citation needed][failed verification]
Though it seems the above may be out of date,
As of 2015, France's household electricity price, excluding taxation, is the 12th cheapest amongst the 28 member European Union and the second-cheapest to industrial consumers.[69] The actual cost of generating electricity by nuclear power is not published by EDF or the French government but is estimated to be between €59/MWh and €83/MWh.[70]
From https://en.wikipedia.org/wiki/... which also has other interesting info.