What major challenge do widely deployed renewable energy sources like solar and wind power often present due to their variable nature, requiring solutions like energy storage or smart grid management?

💡 Explanation:

Solar power depends on sunlight and wind power depends on wind speed, both of which are variable and not constant. This intermittency means they don't produce a steady supply of electricity, which can create challenges for maintaining a stable and reliable electricity grid. Solutions like large-scale energy storage (e.g., batteries) and advanced smart grid technologies are needed to manage these fluctuations.