Why is nuclear fusion not widely used as an energy source?

• A. It is a very expensive fuel source
• B. It is not energy efficient
• C. It has no potential to release energy
• D. It is banned in most countries

Answer: (A)

Fusion energy could, in principle, provide a huge energy return from a small amount of fuel, but the practical barrier is the cost and engineering scale required to make it work. Reaching and sustaining fusion conditions demands incredibly high temperatures and pressures, plus massive, complex containment systems and materials that can withstand intense radiation. Building, operating, and maintaining these reactors is extremely expensive, and scientists have not yet achieved a sustained net energy output that is economically viable for widespread use. That combination of high upfront costs and ongoing operating expenses is why fusion isn’t a practical energy source today. It’s not because it’s banned or because it can’t release energy; the challenge is making it affordable and reliable at scale.