Since the city ended its deal with Global Green Lighting to replace 27,000 lights throughout the city with LED lights EPB has faced scrutiny over its billing.

"I have to say that its total fiction, there has been no over billing," EPB CEO Harold Depriest says.

The city council originally asked the city auditor for its estimated cost of recovery on the project. Stan Sewell came back with a number, 13.2 years for cost recovery in his report, which only includes assumptions and projections.

"The base years or base month we used to project off of was a single month's billing and in that month there was an over billing on energy cost because of the classification of the type of lights," Sewell explains.

In its own audit EPB found the same to be true. "We did find that there were some discrepancies in the lights, meaning there were lights that were listed as high pressure sodium that were actually listed as mercury that were high pressure sodium," Depriest says.

He maintains money was never an issue. "It was not a big deal in money, it was a big deal in the classification of lights," says Depriest.

"There were over billing related to energy charges on the bill and EPB has said that those are offset by discrepancies that resulted in under billing related to facility costs, related to street lights," Sewell says. It's a claim he is currently looking into.

"That's a question I can't answer until we do some more work," says Sewell.

"We goof up, in this case we didn't," Depriest says.