Which Boolean operator would be most effective in excluding irrelevant results when searching for information about 'renewable energy' but specifically excluding 'solar power'?

The Boolean operator 'NOT' would be most effective in excluding irrelevant results when searching for information about 'renewable energy' but specifically excluding 'solar power'. Boolean operators are used in search engines and databases to refine search queries by specifying the relationships between keywords. The 'NOT' operator (sometimes represented by a minus sign '-') instructs the search engine to exclude any results containing the term that follows the operator. Therefore, the search query 'renewable energy NOT solar power' would return results that discuss renewable energy sources, but specifically exclude any results that mention solar power. This allows the user to focus on other forms of renewable energy like wind, hydro, or geothermal without being distracted by information about solar power.