City Cap ExpansionExtras for Humankind is a free utility mod designed for Windows that enhances the gameplay experience for expansionist empires. This modification allows players to modify a few starter civics, increasing the city cap by a total of +6, which significantly aids in city expansion and management. With this boost, players can develop larger empires and explore more strategic opportunities in their gameplay.

In addition to increasing the city cap, this mod also improves the effectiveness of renewable energy sources. Solar farms, wind farms, and nuclear plants are enhanced to remove more pollution, promoting a more sustainable environment within the game. This dual functionality makes City Cap ExpansionExtras a valuable tool for players looking to maximize their expansion potential while maintaining ecological balance.