EarthLink Inc. is pulling the plug on its troubled wireless high-speed Internet network in Philadelphia, once touted as a model for how big cities should deploy Wi-Fi. The Atlanta-based Internet service provider said Tuesday that it could not find a buyer for the $17 million network and that talks to give it to either the city or a nonprofit organization had failed. City officials have said it would cost taxpayers millions each year to operate the network.

"It's been an unfortunate situation," Chief Executive Officer Rolla Huff told The Associated Press. "It was a great idea a few years ago, ... but it's an idea that simply didn't make it."

EarthLink, which will give current customers until June 12 to switch to another provider, said it even offered to donate the Wi-Fi equipment to someone and give them an additional $1 million.

Meanwhile, EarthLink filed a federal suit Tuesday that seeks to remove its Wi-Fi equipment from city street lights and cap its potential liability at $1 million.

Four years ago, Philadelphia officials announced the EarthLink deal with great fanfare that attracted attention from cities in the United States and around the world.

But the technology itself proved to be difficult to deploy and, at times, unreliable. EarthLink later admitted that its Wi-Fi business model had not panned out. In Philadelphia, EarthLink built the network at no cost to the city. It also pledged to pay the city rent for use of its street lights from which Wi-Fi equipment would be hung.

At the time, EarthLink had wanted to have a direct Internet pipeline into the home so it would not have to buy capacity from phone companies.

Philadelphia officials recently said they want EarthLink to abide by the contract, but would rather not go to court to enforce it.

Councilman Frank Rizzo, an early opponent of the Wi-Fi network, said he hasn't heard of anyone interested in buying EarthLink's network.

"Comcast and Verizon, they haven't even sniffed around," he said of the companies that provide cable and phone-based Internet access in Philadelphia.

He said the city's Wi-Fi network has not been completed.

"EarthLink knows they are vulnerable to litigation," Rizzo said.