Why does Snowball want to build a windmill?

Snowball wants to build a windmill so it can power a machine to create electricity on the farm. Electricity will improve the animals’ comfort by supplying light and heat in their stalls. The electricity also will be used to power numerous machines that can perform the work the animals must do, providing them with more leisure time. With the windmill in operation, all the animals will have more time to relax and to “improve their minds with reading and conversation.”