Will we ever get fusion power?

Fusion vs renewables (solar, wind, storage)

• Many argue fusion is solving the wrong problem: we already have a “fusion reactor in the sky” (the Sun) plus mature solar tech that directly converts light to electricity.
• Strong camp says solar + wind + storage can deliver 100% clean electricity at lower cost than nuclear/fusion, citing massive current deployment and rapidly falling costs.
• Critics counter that solar is intermittent (“night”, “clouds”, winter at high latitudes), and seasonal variation in places like Northern Europe makes pure solar impractical without huge overbuild or long‑duration storage.
• Several note that renewables are already replacing coal and nuclear in multiple countries, but almost never without backup from gas or other dispatchable sources.

Grid reliability, geography, and storage

• Debate over how much storage is really needed: some claim only hours–days plus overbuilt renewables; others cite studies suggesting up to ~2 weeks of backup for rare “dunkelflaute” (low wind + solar).
• Ideas floated: batteries (lithium and beyond), hydrogen in salt caverns, molten salt and sand/heat storage, pumped hydro, demand shifting, and continent‑scale HVDC “macrogrids.”
• Northern/high‑latitude commenters emphasize poor winter solar and limited hydro/geothermal, expecting continued reliance on gas or new nuclear.
• Battery price trends are disputed: long‑term cost collapse vs. recent slower declines; disagreement whether costs will fall enough for massive grid storage.

Economics, funding, and timelines for fusion

• Broad agreement that fusion is physically possible; main doubts are cost, complexity, and timing.
• Several expect experimental ignition and net‑positive reactors (ITER/DEMO) but doubt they will be cost‑competitive with cheap renewables and storage.
• Many think fusion will arrive too late to matter for decarbonization this century; at best it helps after net‑zero (e.g., carbon removal, space or remote use).
• Some argue fusion is “always 20–50 years away” because funding is too low compared to its potential; others say low funding reflects weak economics and lack of weapons value (unlike fission).

Specific fusion efforts and skepticism

• Optimistic mentions: Helion (direct electricity, Microsoft contract), Commonwealth Fusion Systems/SPARC (high‑field REBCO magnets), ITER and a future DEMO plant.
• Skeptics point to: extremely long build times (compare to fission), unsolved materials issues (neutron damage, embrittlement, remote replacement), and the risk that many startups mirror past overhyped projects (e.g., Lockheed’s compact fusion, since cancelled).
• Some predict ITER will technically work but be a dead economic end due to low power density and enormous cost.

Nuclear fission, politics, and public acceptance

• Fission seen by some as a more realistic clean baseload option than fusion, but politically toxic in several countries (Germany’s phase‑out cited; others note it was decades in the making, not a pure “knee‑jerk”).
• Others claim nuclear is inherently too expensive relative to renewables and mainly persists because of military/strategic value and sunk expertise.

Space‑based and global energy systems

• Space solar: continuous generation, higher flux, but likely uneconomic due to launch, large receivers, and transmission; perhaps more relevant for space industry than terrestrial grids.
• Global or continental grids could smooth intermittency by moving power across time zones and climates, but raise cost, infrastructure, and security concerns (dependency on foreign lines vs. local fuel stockpiles).

Fringe and speculative ideas

• Claims about alternative physics (e.g., “hydrinos”/Brilliant Light Power) are widely dismissed as pseudoscience, noting long‑running promises with no commercial product.
• A few speculative comments discuss very long‑term futures, quantum‑fusion fantasies, or civilization‑scale energy limits, but these are treated as thought experiments, not near‑term solutions.