Grain Silos are used for offline income. Each base silo adds an hour of income.
The number of silos one can build is dependent on their Permit. A standard permit allows for 2 silos, while a pro permit allows for 10 silos.
The base cost of each silo is listed in the following table. The first silo is free.
The formula for calculating silo costs changed in update 1.9.
Formula for cost: TBA
There is 1 Epic Upgrade that can increase the money production factor of silos.
Silo Capacity Edit
Silo Capacity allows you to increase the away-time by six minutes per level. There are twenty levels, maxing out at an additional two hours per silo.
Silo Quality Edit
As of 1.9, silo quality no longer can be upgraded by epic researching. The Pro Permit will automatically grant the user full quality silos, whereas with standard permit, you will only get half quality.