Homes being built in a New York Hudson Valley cul-de-sac offer prospective buyers wooded lots, pretty views and — oh yes — the promise of thumbing your nose at the power utility.

These “zero-net energy” homes will feature thick walls, solar panels and geothermal heating and cooling systems, meaning families should be able to generate more energy over a year than they consume. These homes under construction 70 miles north of New York City have costly green features. But the builders believe they are in tune with consumers increasingly concerned about the environment and fuel costs.