Canadian Press: Workers spent the past winter tinkering with high-tech turbines slung beneath a barge in the cold waters off the Maine coast before getting them to produce a modest 20 kilowatts, enough electricity to power a half-dozen homes. Far from discouraged, Ocean Renewable Power Co. is spending the summer preparing to deploy larger turbines capable of producing up to five megawatts, enough electricity to power 5,000 houses. Eventually, the company envisions producing enough electricity …