ARCADIA, Fla. — Greg Bove steps into his pickup truck and drives down a sandy path to where the future of Florida’s renewable energy plans begins: acres of open land filled with solar panels that will soon power thousands of homes and business.

For nearly a year, construction workers and engineers in this sleepy Florida town of citrus trees and cattle farms have been building the nation’s largest solar panel energy plant. Testing will soon be complete, and the facility will begin directly converting sunlight into energy, giving Florida a momentary spot in the solar energy limelight.

The DeSoto Next Generation Solar Energy Center will power a small fraction of Florida Power & Light’s 4 million-plus customer base; nevertheless, at 25 megawatts, it will generate nearly twice as much energy as the second-largest photovoltaic facility in the U. S.

The White House said President Obama is scheduled to visit the facility Tuesday, when it officially goes online and begins producing power for the electric grid.

As demand grows and more states create mandates requiring a certain percentage of their energy come from renewable sources, the size of the plants is increasing. The southwest Florida facility will soon be eclipsed by larger projects announced in Nevada and California.

“We took a chance at it, and it worked out,” said Bove, construction manager at the project, set on about 180 acres of land 80 miles southeast of Tampa. “There’s a lot of backyard projects, there’s a lot of rooftop projects, post offices and stores. Really this is one of the first times where we’ve taken a technology and upsized it.”

Despite its nickname, the Sunshine State hasn’t been at the forefront of solar power. Less than 4 percent of Florida’s energy has come from renewable sources in recent years. And unlike California and many other states, Florida lawmakers haven’t agreed to setting clean energy quotas for electric companies to reach in the years ahead.

California, New Jersey and Colorado have led the country in installing photovoltaic systems; now Florida is set to jump closer to the top with the nation’s largest plant yet.

The DeSoto facility and two other solar projects Florida Power & Light is spearheading will generate 110 megawatts of power, cutting greenhouse gas emissions by more than 3.5 million tons. Combined, that’s the equivalent of taking 25,000 cars off the road each year, according to figures cited by the company.

The investment isn’t cheap: The DeSoto project cost $150 million to build, and the power it supplies to some 3,000 homes and businesses will represent just a sliver of the 4 million-plus accounts served by the state’s largest electric utility.

But there are some economic benefits: It created 400 jobs for draftsmen, carpenters and others whose work dried up as the southwest Florida housing boom came to a closure and the recession set in. Once running, it will require few full-time employees.

Mike Taylor, director of research and education at the nonprofit Solar Electric Power Association in Washington, said the project puts Florida “on the map.”

“It’s currently the largest,” Taylor said of the DeSoto photovoltaic plant. “But it certainly won’t be the last.”