What does 'retail service provider' actually mean?

"The energy industry has rejected calls from Optus, Telstra and the Federal Opposition for the National Broadband Network Company to be prevented from supplying retail services to utilities, saying that receiving retail services would over-complicate energy networks."

In my opinion, there is no way that a bank or an energy utility should be able to be classified as a retailer service provider and buy services from NBN Co - as fundamentally, these companies are end user companies, not service providers, and should be classified as such. There are companies like Macquarie Telecom which have been set up exactly to service the business market.