You could include some of the following points in your essay:

• Old Major uses his power to motivate the animals to be involved in the revolution
• the animals use their power to work together to bring in the harvest quicker than in Jones’s day
• Snowball tries to organise the animals into various committees
• Snowball tries to promote literacy and a communal spirit
• the animals’ power is effective during the Battle of the Cowshed and the Battle of the Windmill