Subsidy-free renewables could appear in a second country after an auction this week in the Netherlands, which is seeking about $2.7 billion to develop a giant offshore wind farm. The government on Friday will receive bids to install 700 megawatts of turbines on the seabed off its southwest coast near The Hague, enough to supply about 1 million homes. Once the most costly of the mainstream clean-energy technologies, offshore wind costs have plunged sharply in the past two years as manufactures brought out bigger turbines.