What is a key challenge associated with wind and solar energy that affects operations?

• A. The energy produced is always constant and reliable.
• B. Intermittency requiring storage or backup.
• C. Renewable energy has no environmental trade-offs.
• D. Solar and wind produce more waste heat than CO2.

Answer: (B)

Wind and solar energy are intermittent: their output depends on weather, cloud cover, and the time of day, so they don’t provide a constant, fully controllable supply. In operations, this variability means grid managers must continuously balance supply and demand, using forecasts, flexible generation, and storage or backup resources to cover when wind dies down or the sun isn’t shining. Storage technologies, like batteries or pumped hydro, store excess energy when production is high and release it when it’s low, while backup plants can ramp up to fill gaps. This need to smooth fluctuations and ensure reliability is the central operational challenge of integrating wind and solar. The other statements don’t fit because generation isn’t always constant, there are environmental trade-offs to consider in renewable energy, and waste heat is not the primary concern with wind and solar.