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PolitiFact Florida | St. Petersburg Times
Sorting out the truth in state politics

PolitiFact: State Sen. Alexander way off on solar panel payback

The Florida solar rebate debate begs for a little sunshine.

The state owes Floridians $52.7 million in unpaid solar energy rebates. But lawmakers recently ignored Gov. Charlie Crist's request to tap federal stimulus money to dent the backlog.

Senate budget chief J.D. Alexander, R-Lake Wales, told a St. Petersburg Times reporter, "It takes as much energy to make a solar panel as it likely generates in its entire life. I really doubt that this is a good investment for the people of Florida."

His energy payback claim caught some eyes — and ours.

Steve Plice quickly e-mailed PolitiFact Florida. To the president of Tampa Bay Living Green, a nonprofit that teaches about environmental sustainability, Alexander's claim stuck out. "Could you please check this?" he asked. "I have seen estimates for the energy payback period ranging from 18 months to 11 years. Solar panels are expected to last 20-30 years, so Mr. Alexander's claims would seem to be very wrong."

As Plice suggests, this isn't unexplored territory. For years, energy payback studies have examined how much energy it takes to manufacture, install and operate various kinds of solar panels, also referred to as photovoltaic modules or arrays. The idea is, a solar panel should capture more energy over its lifetime than it saps. Otherwise, as Alexander notes, one would hardly be a "good investment."

We asked Alexander for support for his comments. He sent a link to a solar energy payback study he thought we "may find helpful." And did we ever.

The study published by Energy Bulletin, an online clearinghouse of news and analysis, did, indeed, address Alexander's claim. It mentioned the most commonly cited — and "possibly the only" — study that says the energy payback time on a solar panel may exceed its lifetime. The Energy Bulletin authors hadn't found any published studies that reference the work, a 1996 book by Howard Odum called Environmental Accounting. They did note the popularity of Odum's analysis on Web forums. Then they explain why Odum's findings can be rejected.

The Energy Bulletin authors, who reviewed other published work to reach wider conclusions about roof-mounted solar panel systems — a type a Florida homeowner might install — concluded the systems would generate enough electricity to cover their energy debt in two to eight years, and turn sunlight into energy for at least 25 years.

So, they wrote in 2006, the systems "have a positive energy payback and are capable of contributing to a sustainable energy future."

Alexander's own link debunks his claim. But we were ready to examine other evidence, just in case.

In 1975, the Florida Legislature created the Florida Solar Energy Center to research, test and certify solar systems and develop education programs. Dr. James Fenton, a professor of mechanical, materials and aerospace engineering, directs the institute at the University of Central Florida.

Fenton pointed us to a study published two years later than Alexander's that focuses on emissions from the life cycle of photovoltaic cells, and makes references to multiple energy payback studies. It explains that the life cycle of a photovoltaic system starts with mining quartz sand or metal ore, depending on the type of system, which then has to be purified and turned into silicon wafers or thin film. That takes a lot of energy, right?

Sure, but only as much as is generated by solar systems in three to six years, and sometimes as little as a year or so, especially in sunnier climates, the study summarizes.

The U.S. Department of Energy also weighs in on the topic, through a PV (photovoltaics) FAQs explainer piece called "What is the energy payback for PV?" produced by the National Renewable Energy Laboratory. No good news for Alexander's claim here. Instead, the FAQ says, "Based on models and real data, the idea that PV cannot pay back its energy investment is simply a myth."

It concludes that for an investment of one to four years' worth of energy output, rooftop systems can provide 30 years or more of clean energy.

Other studies sent our way reached similar conclusions.

Alexander's own evidence says his view "can be rejected," and a mainstream consumer publication calls it "simply a myth." But he uses this long-debunked claim to help justify rejecting $13.9 million in federal funds for Floridians. We have no choice other than to focus a little sunlight his way and declare his view Pants on Fire.

The statement

"It takes as much energy to make a solar panel as it likely generates in its entire life."

State Sen. J.D. Alexander,
in a news article

The ruling

Sen. Alexander's own evidence says his view "can be rejected," and a mainstream consumer publication calls it "simply a myth." We rate this Pants on Fire.

PolitiFact: State Sen. Alexander way off on solar panel payback 10/02/10 [Last modified: Tuesday, February 15, 2011 4:40pm]
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