Republic Services is the second largest provider of non-hazardous solid waste collection, transfer, disposal, recycling, and energy services in the United States. The company is engaged in landfill gas-to-energy and renewable energy projects. The company generates revenues mainly from its solid waste collection operations. The remaining revenue comes from other services, which includes transfer station, landfill disposal, recycling, and energy services. Collection Services unit provides commercial, residential, industrial and other services. Residential collection operations are performed under contracts with municipalities and include collection of refuse from containers into collection vehicles and dumped to transfer stations or landfills. On the commercial and industrial side, the company supplies its customers with waste containers and rents compactors to large waste generators. Transfer Services unit deposits waste at its transfer stations.