It is not easy to answer this question. The cost of each power plant is different. The larger the unit, the lower the cost. Generally, the coal consumption per kilowatt hour of electricity is more than 300 grams, and there are also more than 200 grams of coal. There are also labor costs, equipment costs, bank loan costs, tax costs, etc. Generally, it costs between 2 cents and more than 3 cents per kilowatt hour.
There are two main types of cold water discharged from nuclear power plants, namely evaporative cooling water discharged from cooling towers and primary water discharged from nuclear reactors.
For evaporative cooling water discharged from the cooling tower, it is actually water that exchanges heat and has a lower temperature. It dissipates heat through continuous evaporation and maintains it at a certainno temperature. This type of water is treated secondary water. This is not unique to nuclear power plants. Similar processes are used in other industries.
The other is the discharge of primary water from nuclear reactors. This water is treated deionized water and is suitable for nuclear power plants. In a nuclear power plant, the water in the primary circuit is not in direct contact with the environment, while the cooling water in the secondary circuit is in direct contact with the environment. The quality of the water in the secondary circuit is therefore very good. demanding and the stability of water quality must be ensured. The discharge of this water into the environment has practically no impact on the environment.
In summary, cold water discharged from nuclear power plants is mainly evaporative cooling water and primary water from nuclear reactors. This water has been treated and has a low temperature, which has alow impact on the environment.