Any user can use their wallet to generate rain with their funds, and distribute it on a project of their choice. If a user rains 1000 GRC on project X, and you are currently contributing 10% of the total compute power to project X, you receive 10% (100 GRC) of the rain.

While the Gridcoin network rewards a base level of compute for all projects on the whitelist, this enables a project admin to draw in even more compute power to their project.