The Energy Department analysis provides only a broad outline, and many of the details will be decided by congressional lawmakers.
The Biden administration on Wednesday released a blueprint for producing almost half of the nation’s electricity from the sun by 2050 — something that would require the country to double the amount of solar energy installed every year over the next four years and then double it again by 2030.
The expansion of solar energy is part of President Biden’s effort to fight climate change, but the new target would represent a huge leap with little historical precedent — solar energy contributed less than 4 percent of the country’s electricity last year.
Such a large increase, laid out in an Energy Department report, is in line with what most climate scientists say is needed to stave off the worst effects of global warming. It would require a vast transformation in technology, the energy industry and the way people live.
The Energy Department said its calculations showed that solar panels had fallen so much in cost that they could produce 40 percent of the country’s electricity by 2035 — enough to power all American homes — and 45 percent by 2050.
Getting there will mean trillions of dollars in investments by homeowners, businesses and the government. The electric grid — built for hulking coal, natural gas and nuclear power plants — would have to be almost completely remade with the addition of batteries, transmission lines and other technologies that can soak up electricity when the sun is shining and to send it from one corner of the country to another.
The new report is consistent with climate and energy plans laid out by Mr. Biden during his campaign last year, when he said he wanted to bring net planet-warming emissions from the power sector to zero by 2035. He also wants to add hundreds of offshore wind turbines to the seven currently in American waters. And last month, he announced that he wanted half of all new cars sold be electric by 2030 in a White House event with executives from three of the nation’s largest automakers — a goal that will depend in large part on whether there will be enough places to plugs in those cars.
But administration officials have provided only a broad outline for how they hope to clean up the country’s energy system and its cars and trucks. Many details will ultimately be decided by Congress, which is working on a bipartisan infrastructure bill and a much larger Democratic measure that could authorize $3.5 trillion in federal spending.
While renewable energy has grown fast, it provides about 20 percent of the country’s electricity. Natural gas and coal account for about 60 percent. In February, a division of the Energy Department projected that the share of electricity produced by all renewable sources, including solar, wind and hydroelectric dams, would reach 42 percent by 2050 based on current trends and policies.
“That kind of quick acceleration of deployment is only going to happen through smart policy decisions,” said Abigail Ross Hopper, the president of the Solar Energy Industries Association. “That’s the part where having a goal is important, but having clear steps on how to get there is the issue.”
One thing going for the administration is that the cost of solar panels has fallen substantially over the last decade, making them the cheapest source of energy in many parts of the country. The use of solar and wind energy has also grown much faster in recent years than most government and independent analysts had predicted.
“One of the things we’re hoping that people see and take from this report is that it is affordable to decarbonize the grid,” said Becca Jones-Albertus, director of the Solar Energy Technology Office in the Energy Department. “The grid will remain reliable. We just need to build.”
The administration is making the case that the United States needs to act quickly because not doing anything to reduce reliance on fossil fuels also has significant costs, particularly from extreme weather linked to climate change. On Tuesday, on a visit to inspect damage from the intense rainfall caused by the remnants of Hurricane Ida in New Jersey and New York, Mr. Biden said, “The nation and the world are in peril.”
Some recent natural disasters have been compounded by weaknesses in the energy system. Ida, for example, dealt a huge blow to the electric grid in Louisiana, where hundreds of thousands of people have been without power for days. Last winter, a storm left much of Texas without electricity for days, too. And in California, utility equipment has ignited several large wildfires, killing scores and destroying thousands of homes and businesses.
Mr. Biden wants to use tax credits to encourage the use of solar power systems and batteries at homes, businesses and utilities. The administration also wants local governments to make it quicker to obtain permits and build solar projects — in some places it can take months to put panels on a single-family house, for example. And officials want to offer various incentives to utility companies to encourage solar-energy use.
Jennifer M. Granholm, Mr. Biden’s energy secretary, said part of the administration’s strategy would focus on its Clean Electricity Payment Program, which would reward utilities for adding renewable energy to the electric grid, including rooftop solar. Many utility companies have fought against rooftop solar panels because they see a threat to their business and would rather build large solar farms that they own and control.
“Both have to happen, and the utilities will be incentivized to take down the barriers,” Ms. Granholm said. “We’ve got to do a series of things.”
Challenges like trade disputes could also complicate the push for solar power. China dominates the supply chain for solar panels, and the administration recently began blocking imports connected with the Xinjiang region of China over concerns about the use of forced labor. While many solar companies say they are working to shift away from materials made in Xinjiang, energy experts say the import ban could slow the construction of solar projects throughout the United States in the short term.
Still, administration officials pointed to changes being made by state and local officials as an example of how the country could begin to move faster toward renewable energy. Regulators in California, for example, are changing the state’s building code to require solar and batteries in new buildings.
Another big area of focus for the administration is greater use of batteries to store energy generated by solar panels and wind turbines for use at night or when the wind is not blowing. The cost of batteries has been falling but remains too high for a rapid shift to renewables and electric cars, according to many analysts.
To some solar industry officials, the Energy Department report ought to help to focus people’s minds on what is possible even if lawmakers haven’t worked out the details.
“In essence the D.O.E. is saying America needs a ton more solar, not less, and we need it today, not tomorrow,” said Bernadette Del Chiaro, executive director of the California Solar and Storage Association, which represents solar developers in the state with by far the largest number of solar installations. “That simple call to action should guide every policymaking decision from city councils to legislatures and regulatory agencies across the country.”
Brad Plumer contributed reporting.
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