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2024 Year in Review: Clean Energy Progress Steeped in Solar and Storage

Union of Concerned Scientists

Heres a taste, from US projects, technologies, electrons, and investment, to happenings in the world as a whole. Solar US solar looks set to come very close to almost match, or even surpass, the record it set in 2023 for new installations. It added up to 24% of total electricity generation in 2024, compared with 23% in 2023.

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Why the World Needs a New UN Study on the Effects of Nuclear War

Union of Concerned Scientists

A 2023 study by the US National Academies on Risk Analysis Methods for Nuclear War and Nuclear Terrorism , tasked to look at the likelihood and consequences of different nuclear war scenarios, found the information about the consequences incomplete. This lack of understanding is not limited to the public.

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What are the environmental impacts of artificial intelligence? 

Union of Concerned Scientists

One growing conversation in the use or non-use of GenAI is the environmental implications of the technology in every step of its life cycle. The communities breathing polluted air near data centers or those experiencing increased energy costs are the ones at the frontline of the technology’s impacts and often last its benefits.

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Maine Commits to 100% Clean Electricity by 2040 

Union of Concerned Scientists

Governor Mills called for accelerating Maine’s clean electricity standard to 100% by 2040 in her 2023 State of the Budget Address when the state was facing extremely high fossil fuel prices following the Russian Invasion of Ukraine. She signed the bill into law on June 20, 2025.

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Does California Need New Nuclear Power Plants?

Union of Concerned Scientists

More recently, a 2023 bill would have exempted SMRs from the ban on new nuclear power plants, and a 2024 bill would have required a study on the feasibility and benefits of deploying SMRs. The cost of other energy technologies matters as well. Second, as I mentioned earlier, the cost of other clean energy technologies matters too.

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What Are Distributed Energy Resources?

Union of Concerned Scientists

The rapid advances in wind turbine, solar panel, and battery technology in recent years mean that generation no longer needs to be confined to large, centralized power plants connected to transmission lines far from where energy is used. How is the grid changing? Data source: U.S. Energy Information Agency. Make this plot yourself.

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How Much Transit Investment Is Needed to Get Back to “Normal”?

Union of Concerned Scientists

Thats a big number with consistent growthweekly ridership grew from April 2020 to 2021 by 101%, 2021-2022 by 54%, 2022-23 by 6%, 2023-24 by 17%, and 2024-25 by 12%. From 2019-2023, road construction inflation (12% annual) was around 66% higher than for transit operations (7% annual).

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