Learn › Comparisons & deep-dives
Comparison
Firm Clean Power Options Compared
Fusion, fission, geothermal, hydro, and gas-with-capture all offer firm low-carbon power. Here's how they compare — and where fusion's profile stands out.
- Fusion
- Firm; no meltdown/waste; siteable; developing
- Fission
- Firm; proven; waste + proliferation
- Geothermal/Hydro
- Firm; geography-limited
- Gas + CCS
- Firm; residual emissions + fuel cost
A decarbonized grid needs firm clean power, and several technologies contend for that role. Each has real strengths and real limits.
| Option | Profile |
|---|---|
| Fusion | Firm, siteable, no meltdown or long-lived waste, abundant fuel — but still in development |
| Fission | Firm and proven — but long-lived waste, proliferation, mined fuel |
| Geothermal / hydro | Firm and clean — but limited to favourable geography |
| Gas + carbon capture | Firm and flexible — but residual emissions, fuel-price risk, capture cost |
No single option is the whole answer, and a resilient grid will likely use several. Fusion's distinctive appeal is combining firmness with siting flexibility, an excellent safety and waste profile, and inexhaustible domestic fuel — the reason it's often called the firm clean source without the usual drawbacks. Kronos's low-neutron design sharpens each of those. See what is firm power?