Every time we talk about lunar fission, someone asks the same question:

"Why not just use solar?"

It's a fair question.

The answer lies in one unavoidable fact about the Moon.

A lunar day lasts 29.5 Earth days.

That means every location on most of the Moon experiences approximately:

• 14.5 days of continuous sunlight
• 14.5 days of complete darkness

During that lunar night, surface temperatures can fall to -180°C (-292°F).

Solar panels don't generate electricity without sunlight.
For two straight weeks, every system depending solely on solar power stops operating.
Mining.
Manufacturing.
Research stations.
Propellant production.
Life support.
Everything.

In theory, you could store enough energy during the day to survive the night.
In practice, the numbers become overwhelming.
Supporting continuous operations for 14.5 days would require enormous energy storage systems that dramatically increase launch mass, cost, complexity, and maintenance requirements.
For the scale of infrastructure envisioned for a permanent lunar presence, today's battery technologies simply aren't practical.

Another common suggestion is to build only near the lunar south pole.
It's true that several elevated ridges along crater rims receive far more sunlight than most locations on the Moon.
But they are not permanently illuminated.
The best sites receive roughly 80-90% illumination, meaning they still experience periods without sunlight.
Those locations are also extremely limited.
They consist of relatively small areas scattered across the polar region.
You can't build an entire lunar industrial economy around a few hundred meters of favorable terrain.
Resources aren't located only at the poles.
Future mining sites, manufacturing facilities, research stations, and transportation hubs will need to operate wherever the mission requires - not wherever sunlight happens to last the longest.

Fission doesn't depend on the Sun.
It provides continuous power:

• Day and night
• At the poles or the equator
• Through eclipses and dust accumulation
• Anywhere on the lunar surface

Solar power will absolutely be part of the lunar energy mix.
During the lunar day, it's efficient, abundant, and valuable.
But solar alone cannot provide the reliable baseload power needed for permanent infrastructure.

A reactor alone isn't enough.
Lunar fission requires radiation shielding, containment vessels, structural foundations, thermal management systems, and other heavy infrastructure that cannot be economically launched from Earth.
That's the challenge Lunar Forge is solving.
We're developing autonomous manufacturing systems that transform lunar regolith into the infrastructure required to make continuous lunar power practical.
Because the future of the Moon doesn't depend on generating power.
It depends on sustaining it.