A little known company that is building a large solar farm near Boston is looking to expand to other states.

Longfield Gardens is building an 11-megawatt solar farm that will be the largest on the East Coast, but it has the potential to be even larger, according to its investors.

Longfield, the third-largest solar project in the country, is working with a solar-energy developer called Blue Point Energy and SunPower.

Longpoint plans to install more than 4,000 solar panels on a 1,000-acre parcel at the northwest corner of Newburyport and Longfield streets in Newbury Park, about an hour southeast of Boston.

The company is developing a new facility that is expected to be complete by the end of this year, said David Pugh, Longfield’s director of solar and wind energy.

It will be a full-scale, 24-hour-a-day operation, with a full mix of residential and commercial buildings.

Pugh declined to provide details about the project, but said that the company plans to build about 600 residential and office units and about 200 commercial units.

The project is the latest in a string of solar-power projects that have come out of New England, where the region has been among the most successful in the world, with nearly 80 percent of its power coming from renewable sources.

The state has a renewable portfolio standard that limits carbon emissions from power plants and the region’s solar industry has been growing rapidly.

New England’s solar boom is largely driven by state incentives, said Daniel Sisak, executive director of the Solar Energy Industries Association, a trade group for the solar industry.

In Connecticut, for example, solar incentives are at about 35 percent, Sisag said.

In Connecticut, solar installations have increased nearly 25 percent in the last year, compared with the same period last year.

The rate is similar to that in Massachusetts, where solar installations grew by more than 70 percent, according the state Department of Energy and Environmental Protection.

In New York, SolarCity Inc. and other companies have built solar farms and large-scale solar arrays in cities across the state, including Long Island, which has the nation’s second-largest installed solar capacity, after New York City.

The Longfield project is expected in the middle of next year, and it is expected that it will be completed by late 2018, said John DeCecco, Longpoint’s chief executive officer.

Longpoint, which was founded in 2009, is a private, for-profit company, and the company was founded by a Boston resident, said Kevin Koeppel, a partner at Koeppel Partners LLC.

Koeppel said that Longpoint has already secured about $15 million in private financing.

It expects to be able to raise another $20 million from private investors, including New York-based investment firm Colony Capital Management, according and investor disclosures.

Pugh declined requests for comment on the potential size of the Longpoint project.

Longmont Solar, an investor in the Longfield plant, declined to comment.

SolarCity has invested in more than 60 solar projects across the U.S., according to data from Solar Energy Association.

SolarCity did not respond to a request for comment.

The solar industry’s boom is fueling a broader surge in solar energy, with residential and business customers buying more and more solar panels in recent years.

The U.K. has seen the fastest growth in solar panels installed per capita in the developed world.