Napoleon enacts changes to the governance structure of the farm, replacing meetings with a committee of pigs who will run the farm. Through a young porker named Squealer, Napoleon claims credit for the windmill idea, claiming that Snowball was only trying to win animals to his side. The animals work harder with the promise of easier lives with the windmill.
In this context, Napoleon's actions and statements reflect a power struggle on the farm, where he manipulates information and introduces new governance structures to consolidate his control. The introduction of the windmill idea is presented as a means to improve the animals' lives, but it also serves to further Napoleon's own interests.