PRAGUE, April 30 (Reuters) - Czech majority state-owned utility CEZ has received updated binding bids from South Korea's KHNP and France's EDF in a long-running tender to build up to four nuclear power units, the company said on Tuesday.

The Czech Republic is aiming to keep nuclear power as a key part of its energy mix in the coming decades and had earlier widened the tender to possibly build multiple blocks with capacity of more than 1,000-megawatts each, up from an originally planned one unit.

The Czech government, which owns 70% of CEZ, will assess the bids along with CEZ, one of central Europe's biggest companies with a market capitalisation of nearly $20 billion, and pick the winner in the coming months.

"It is expected that the contracts will be finalised during this year and ready for signing by 31 March 2025," CEZ said.

The government and CEZ widened the scope of the tender to help push the price of each block down in what is likely to be the country's largest-ever energy investment. It is, however, yet to decide how many blocks will eventually be built. (Reporting by Jan Lopatka and Jason Hovet; Editing by Kirsten Donovan)