Really the entire goal should be both renewables and nuclear. Nuclear provides a reliable baseline that isn't dependent on weather conditions, is incredibly safe, and will last a long time at the cost of large upfront construction costs. Renewables are great for main power generation and can be used for small scale or large scale power generation and built quickly, but they need the weather to be optimal to generate optimal power. They also need to be mantained and replaced more often, which can be covered by that baseline nuclear provides. Since we don't have advanced enough power storage to use renewables exclusively due to their drawbacks, nuclear would be great for replacing coal and oil power plants to supply it when the renewables aren't able to do all of the work.