No. If it were cheapest companies would be building nuclear. Right now in the U.S. the cheapest are wind, natural gas and solar.
New-build nuclear is far more expensive, per kWh, than renewables. In Europe, even off-shore wind - one of the most expensive renewables - is now coming in much cheaper than nuclear projects.
In the US, even many old nuclear plants are struggling to compete without subsidies against renewables and natural gas.