"A conversion of this scale would also create jobs, stabilize fuel prices, reduce pollution-related health problems, and eliminate emissions from the United States," says Mark Jacobson. "There is very little downside to a conversion, at least based on this science." (Credit: Activ Solar/Flickr)

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Can the US have 100% clean energy by 2050?

Converting the world’s entire energy infrastructure to run on clean, renewable energy could effectively fight ongoing climate change, eliminate air pollution deaths, create jobs, and stabilize energy prices.

The challenge is a daunting one. But scientists say it’s possible.

Researchers are the first to outline the 50 individual state plans that call for aggressive changes to both infrastructure and the ways we currently consume energy, but indicate that the conversion is technically and economically possible through wide-scale implementation of existing technologies.

“The main barriers are social, political, and getting industries to change,” says Mark Z. Jacobson, professor of civil and environmental engineering at Stanford University. “One way to overcome the barriers is to inform people about what is possible. By showing that it’s technologically and economically possible, this study could reduce the barriers to a large scale transformation.”

Energy demands

Researchers started by taking a close look at the current energy demands of each state, and how those demands would change under business-as-usual conditions by the year 2050. To create a full picture of energy use in each state, they examined energy usage in four sectors: residential, commercial, industrial, and transportation.

For each sector, they then analyzed the current amount and source of the fuel consumed—coal, oil, gas, nuclear, renewables—and calculated the fuel demands if all fuel usage were replaced with electricity. This is a significantly challenging step—it assumes that all the cars on the road become electric, and that homes and industry convert to fully electrified heating and cooling systems. But researchers say their calculations are based on integrating existing technology, and the energy savings would be significant.

“When we did this across all 50 states, we saw a 39 percent reduction in total end-use power demand by the year 2050,” Jacobson says. “About 6 percentage points of that is gained through efficiency improvements to infrastructure, but the bulk is the result of replacing current sources and uses of combustion energy with electricity.”

The next step involved figuring out how to power the new electric grid. The researchers focused on meeting each state’s new power demands using only the renewable energies—wind, solar, geothermal, hydroelectric, and tiny amounts of tidal and wave—available to each state.

They analyzed each state’s sun exposure, and how many south-facing, non-shaded rooftops could accommodate solar panels. They developed and consulted wind maps and determined whether local offshore wind turbines were an option. Geothermal energy was available at a reasonable cost for only 13 states. The plan calls for virtually no new hydroelectric dams, but does account for energy gains from improving the efficiency of existing dams.

Wind and sun are free

Their report includes an interactive map that lays out individual plans for each state to achieve an 80 percent transition by 2030, and a full conversion by 2050.

Several states are already on their way, Jacobson says. Washington state, for instance, could make the switch to full renewables relatively quickly, thanks to the fact that more than 70 percent of its current electricity comes from existing hydroelectric sources. That translates to about 35 percent of the state’s all-purpose power if Washington were 100-percent electrified; wind and solar could fill most of the remainder.

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Iowa and South Dakota are also well-positioned, as they already generate nearly 30 percent of their electricity from wind power. California, which was the focus of Jacobson’s second single-state roadmap to renewables after New York, has already adopted some of his group’s suggestions and has a plan to be 60 percent electrified by renewables by 2030.

Published in the journal Energy and Environmental Sciences, the plan calls for no more than 0.5 percent of any state’s land to be covered in solar panels or wind turbines. The upfront cost of the changes would be significant, but wind and sunlight are free. So the overall cost spread over time would be roughly equal to the price of the fossil fuel infrastructure, maintenance, and production.

“When you account for the health and climate costs—as well as the rising price of fossil fuels—wind, water, and solar are half the cost of conventional systems,” Jacobson says. “A conversion of this scale would also create jobs, stabilize fuel prices, reduce pollution-related health problems, and eliminate emissions from the United States. There is very little downside to a conversion, at least based on this science.”

If the conversion is followed exactly as the plan outlines, the reduction of air pollution in the US could prevent the deaths of approximately 63,000 Americans who die from air pollution-related causes each year. It would also eliminate US emissions of greenhouse gases produced from fossil fuel, which would otherwise cost the world $3.3 trillion a year by 2050.

Mark Delucchi, a researcher at University of California, Berkeley, collaborated on the study.

Source: Stanford University

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