4G company Clearwire loses CEO Bill Morrow

There’s trouble brewing over at Clearwire, the 4G network company in which Sprint holds a non-controlling majority stake. Chief executive Bill Morrow has resigned from his positions as CEO and executive board director, citing the usual “personal reasons,” the company announced today.

On the GreenBeat: A123 opens battery plant, Siemens targets India

A123 opens largest lithium-ion battery plant in the U.S. The Livonia, Mich. plant will expand the company’s manufacturing capabilities by up to 600 megawatt-hours per year, with the goal of ramping up to a total 760M megawatt-hours by next year’s end. The announcement comes one year after A123 was awarded a $249 million grant as part of the American Recovery and Reinvestment Act. As GigaOm notes, A123’s IPO last year opened at $17 per share but now trades at less than $10 per share. Another Michigan-based battery player, Sakti3, made news last week for winning a $3.2 million investment from the venture capital arm of GM.

Sprint partner Clearwire expands 4G, comes out with new phones

4G is the next big leap for the mobile industry, and that’s good news for mobile provider Clearwire. Yesterday the company announced new markets for its 4G network, which will bring the next-generation cellular technology to many smaller cities this summer and to larger cities by the end of the year. The news is also good for Sprint, which will see its 4G availability spread as well as a result of its partnership with Clearwire.

Cisco buys into WiMax for Smart Grid, acquires stake in Grid Net

Cisco Systems has been scouting for major plays in the Smart Grid infrastructure arena for about a year — some analysts even speculated that it would buy wireless networking provider Silver Spring Networks. But today, it announced its decision to go with Grid Net, one of the first and only companies to trumpet WiMAX as the ultimate solution for transmitting data between utilities and smart meters.