One Block Off the Grid started with the same awesome concept that has made Groupon and Living Social the hottest trend in marketing. So it’s no wonder the solar group purchasing company has expanded its reach so dramatically in no time at all.

One Block Off the Grid launched its national solar program, One Nation Off the Grid, earlier this week.

The program is comprehensive, actionable and altruistic.

It starts with an interactive map that drills down to the county level, letting consumers know what the solar incentives are in their area and how many homeowners in their community have already gone solar. It also allows them to see how many have signed up to participate in the solar group purchasing program.

Once a critical mass of people in one county signs up, they’ll be able to see a transparent menu of standard pricing for that community, and those who are interested can have a solar installer give them an at-home estimate. If they decide to install solar panels, One Block will issue them a $500 rebate.

Since 2008, One Block has run more than 50 group solar deals in 10 states. The expansion the company announced this week is massive. One Block now offers solar group purchasing deals in 2,081 communities around the country and has partnered with 175 new solar installers to make it happen.

“We’ve done this in cities all around the country,” said One Block Off the Grid CEO Dave Llorens. “But any place that we didn’t go, it was so hard when people would get groups together and ask for us to come. We would have to tell them we couldn’t do it.”

Not anymore. Just a little more than three years after the company began this business of offering group solar deals, it’s situated to make a major impact in the industry.

The interactive map One Block has created allows people to see what the situation and solar incentives are in their areas and provides contact information for local lawmakers in case people don’t like what they see on the map.

“It gives people a chance to see what their area looks like, and maybe if their community doesn’t look as good as another one, they can say ‘hey look, wouldn’t it be nice if your community looked like that,’” Llorens said. “And they can do something about it.”

In addition to expanding the accessibility to information for solar consumers, One Block has also pledged to donate all of the profits from its new One Nation Off the Grid program to Kiva City, a nonprofit microlending organization that supplies small business loans to people in the cities suffering most from the down economy.