Not long ago, the house of the future was designed to let you to stay plugged in to your music, sports and movies no matter where you were in your home. For instance, a TV screen embedded into the refrigerator door meant you didnt have to wait for a commercial to grab a snack.

But that was before the recession. Now, the new house of the future is being marketed with a decidedly more practical goal in mind: to save you big bucks in energy and water consumption.

Next week, KB Home plans to open a model home in Waldorf targeting the increasingly eco-friendly and cost-conscious consumer who has emerged in wake of the housing slump spurred by the nations worst economic crisis since the Great Depression. It is the first uber-green house that the Los Angeles-based firm has built on the East Coast.

The model, experts say, illustrates a shift in how houses will be built. The builder isnt so much playing up the big lot and spacious interior that appealed to buyers a few years ago, even though the house has both. The main selling point is the variety of innovations aimed at saving homeowners 50,000 gallons of water a year and reducing electric bills to practically nothing.

Built-in features of the net-zero house a sort of Energy-Star-on-steroids designation that means the house produces more energy than it expends include solar panels, a water-saving irrigation system and a charging station for an electric vehicle in the garage. The house even has a monitoring system that allows homeowners to keep tabs on their energy consumption in real time via their smartphones, tablet computers and TVs.

These features to a varying degree are currently available mainly in the custom-home market. But the Waldorf house demonstrates how green is migrating into the mainstream.

Taking a house from energy efficiency to net zero is a dramatic change, said Doug Moran, president of KB Homes Washington region.

Becoming more environmentally friendly has been the focus of the country, Moran added. We want to give people a vision of where we think home building will be in a few years.

Thus far, net-zero houses are a very tiny segment perhaps as small as 1 percent of the market.

Production of energy from solar panels, one of the largest components of the green-home movement, is growing. The amount of megawatts produced by home solar panels rose 104 percent in 2010, 109 percent in 2011 and is expected to increase 75 percent this year, according to Boston-based GTM Research, a consulting firm that tracks the industry for the Solar Energy Industries Association.

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Eco-friendly model home in Maryland reflects green movement’s edging into the mainstream