Standard & Poor?s rating agency has raised the long-term financial strength rating of CEZ Group from BBB+ to the new A- level. Such rating is idendical with the rating of the Czech Republic. CEZ holds the best rating of all power firms in the former Eastern bloc, the same as, for example, the Swedish power concern Vattenfall or the German power company EnBW. CEZ is also a holder of A2 rating from Moody´s.
| Power firm | Country | Rating |
| EDF | France | AA- |
| E.ON | Germany | AA- |
| RWE | Germany | A+ |
| Enel | Italy | A+ |
| ČEZ | Czech Republic | A- |
| Suez | Belgium | A- |
| ENBW | Germany | A- |
| Vattenfall | Sweden | A- |
| Union Fenosa | Spain | BBB+ |
| PPC | Greece | BBB+ |
| MOL | Hungary | BBB- |
| UES RAO | Russia | B+ |