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The report examines the transition of the U.S. power sector from coal to natural gas, noting that while this shift provides immediate benefits, it introduces risks such as price volatility, methane leakage, and potential 'stranded assets'. Using the National Energy Modeling System, the analysis compares a 'Business as Usual' scenario with a 'Carbon Standard plus Renewables and Efficiency Policies' scenario. The findings suggest that the latter would reduce power plant carbon emissions by 70 percent below 2005 levels by 2040, lower consumer energy bills, and provide significant net societal benefits, reaching nearly $170 billion by 2040.

The report examines the transition of the U.S. power sector from coal to natural gas, highlighting that while this shift provides immediate reductions in some pollutants, it creates long-term risks including price volatility, methane leakage, and stranded assets. Through modeling three scenarios—Business as Usual, a Carbon Standard, and a Carbon Standard plus Renewables and Efficiency Policies—the authors find that a diversified energy mix is the most economically and environmentally sound approach. The 'Carbon Standard plus Renewables and Efficiency Policies' scenario is projected to reduce power plant carbon emissions by 70% below 2005 levels by 2040 and generate net societal benefits of nearly $170 billion by that year. The report recommends strengthening the EPA's Clean Power Plan, implementing federal renewable electricity and energy efficiency standards, and increasing regulations on fugitive methane emissions.

The document describes the four primary components of the US electricity grid: individual generators, transmission lines, distribution networks, and consumer load. It details the technical differences between power sources, such as the low flexibility of coal and nuclear plants compared to the rapid ramping of natural gas plants. The text outlines the regulatory roles of state Public Utility Commissions (PUCs) and the federal Federal Energy Regulatory Commission (FERC), and notes the three main US transmission networks: the Western Interconnection, the Eastern Interconnection, and ERCOT. It also traces the grid's history from the victory of alternating current (AC) over direct current (DC) to the 'restructuring' of the 1970s that allowed for wholesale competition. Finally, it identifies potential improvements through energy storage, smart meters, and distributed generation like residential solar panels.

A joint statement from the Attorneys General of New York, Delaware, Maryland, Massachusetts, Oregon, Rhode Island, and Vermont urging the Environmental Protection Agency (EPA) to establish formal emission standards and guidelines for methane in the oil and gas sector following the publication of five technical white papers.

Earthjustice and a coalition of nonprofit organizations petition the EPA to regulate oil and gas wells as area sources, arguing that the rapid expansion of drilling—particularly via hydraulic fracturing—in metropolitan areas poses a non-negligible risk to public health. The document details the emission of toxic air pollutants such as benzene and formaldehyde, highlights the vulnerability of children and overburdened communities, and identifies significant regulatory gaps in existing EPA rules. It concludes that available technologies, such as green completions and vapor recovery units, can substantially reduce these emissions.

The Union of Concerned Scientists (UCS) evaluates the NRC's 2013 performance, noting a decrease in the number and severity of 'near-misses' but highlighting critical inconsistencies in enforcement. While the NRC successfully managed the restart of the Fort Calhoun plant and identified gaps in aging component oversight, it is criticized for allowing the Diablo Canyon and Oconee plants to operate despite known seismic and fire safety risks, and for improperly withholding information regarding the Jocassee Dam's potential to cause a total meltdown at Oconee.

The report finds that weather-related power outages in the U.S. have increased significantly, with weather causing 80% of all major outages between 2003 and 2012. It identifies the Midwest and East as particularly vulnerable regions and argues that climate change acts as a 'threat multiplier,' increasing the frequency and intensity of storms, heat waves, and flooding that strain an aging electrical infrastructure.

The report details how Illinois municipalities use Community Choice Aggregation (CCA) to pool electricity purchasing power, enabling them to negotiate lower rates and switch to cleaner energy sources. Since 2013, over 90 Illinois towns have transitioned to 100% renewable electricity via Renewable Energy Credits (RECs), increasing demand for wind and solar by over 6 terawatt hours. The document provides case studies from Oak Park and Chicago, analyzes CCA adoption in other states like California and Massachusetts, and offers strategic recommendations for municipalities to move beyond RECs toward local renewable energy investments.

The report examines the risks associated with unconventional oil and gas development, specifically hydraulic fracturing, in the United States. It identifies significant threats to groundwater and surface water quality, air pollution, and induced seismic activity from wastewater injection. The authors highlight how corporate and political interference—including 'trade secret' exemptions and non-disclosure agreements—hampers scientific research and public knowledge. It critiques the 'patchwork' of state laws and federal loopholes, such as the 'Halliburton loophole,' and recommends mandatory baseline monitoring, full chemical disclosure, and the closing of federal regulatory gaps to protect public health and the environment.

Ohio is transitioning from coal to natural gas for electricity generation, but this shift maintains significant risks. The report advocates for a more diverse energy mix, highlighting the success of the Alternative Energy Portfolio Standard in reducing costs and creating jobs through wind, solar, and energy efficiency.

Landfills are the third largest source of anthropogenic methane in the United States, contributing 17.7 percent of all U.S. methane emissions. The EPA regulates large municipal solid waste (MSW) landfills and manages the voluntary Landfill Methane Outreach Program (LMOP) to encourage the capture of landfill gas (LFG) for energy production. While projects in landfills with existing capture systems are generally profitable, those requiring new systems may face net losses unless they leverage tax credits, carbon credits, or on-site electricity use. LFG projects can produce electricity, heat, or vehicle fuels, providing both climate benefits and local employment.

The report examines the environmental, logistic, and infrastructural barriers to commercializing cellulosic ethanol from corn stover in the US, concluding that the country will likely fall short of RFS2 mandates.

The Union of Concerned Scientists reports that in 2012, the NRC oversaw 14 'near-misses'—events increasing core meltdown risk by at least 10-fold—at U.S. nuclear plants. The report argues that the NRC frequently fails to enforce existing regulations, such as allowing the Palisades Nuclear Plant to operate for nearly a month despite cooling water leaks that required shutdown within six hours. It also highlights a significant perception gap between NRC senior management and staff regarding the agency's internal safety culture, where half of the workforce reported negative reactions from supervisors after raising safety concerns.

The Union of Concerned Scientists identifies a significant number of U.S. coal-fired power plants that are economically uncompetitive compared to natural gas and wind power. The report argues that retiring these plants, along with those already scheduled for closure, would improve public health and reduce carbon emissions without jeopardizing grid reliability.

The brief highlights the role of the 2008 Farm Bill in stimulating the U.S. biofuels industry and reducing oil dependence. It details specific programs like the Biomass Crop Assistance Program (BCAP) and the Biorefinery Assistance Program, noting that while initial investments of less than $2 billion have shown promise, significant further investment is required to meet Renewable Fuel Standard (RFS) targets for 2022. The author emphasizes that shifting to biofuels can improve energy security, support rural economic development, and mitigate climate change.

The document examines 60 years of summer weather data in the US Midwest, finding that hot and humid air masses are becoming more frequent while cooler air masses are declining. Analysis of both large cities and smaller rural counterparts suggests these trends are driven by broader climate change rather than solely by urban heat island effects, with nighttime temperatures warming faster than daytime temperatures.

The document argues that the EPA's proposed air pollution standards for the natural gas sector are essential for protecting public health and the environment, particularly through the implementation of 'green completion' technology to capture methane and smog-forming emissions from fracked wells. The authors contend that these standards are cost-effective, as the sale of recovered gas offsets compliance costs, and that they will not hinder domestic production, citing examples from Colorado and Wyoming. The letter specifically rejects proposed industry loopholes from the American Petroleum Institute (API), such as VOC percentage thresholds and implementation delays, which the authors claim would exempt millions of tons of pollution and undermine the standards' effectiveness.

The report analyzes 15 significant safety-related 'near-misses' at U.S. nuclear plants in 2011, arguing that many resulted from owners tolerating known safety problems. While it highlights successful NRC interventions at the Fort Calhoun, Hatch, and LaSalle plants, it criticizes the agency for allowing 47 reactors to operate in violation of fire-protection regulations and 27 reactors to operate with deficient seismic protection. The author contends that the NRC often focuses on fixing individual equipment failures rather than addressing the systemic weaknesses in owners' testing and inspection regimes.

The authors argue that the EPA's cost-benefit analysis for cooling water intake structures (CWISs) is fundamentally flawed due to the systematic underestimation of environmental benefits and the overestimation of costs. By incorporating a wider range of non-use values, correcting recreational value estimates based on the Bay Shore Power Plant study, and using revised cost estimates from Powers Engineering, the authors demonstrate that the most stringent regulatory options (Options 2 and 3) can yield positive net benefits. They further contend that the economic impact on electricity rates would be minimal and that stricter regulation would actually be more beneficial for national GDP and employment. Finally, they strongly oppose the use of site-specific calculations, suggesting instead a national standard with a higher threshold (e.g., 500 MGD) to protect smaller facilities while maintaining high environmental benefits.

The report analyzes the potential for the Midwest to transition to a clean energy economy by adopting the Midwestern Governors Association's (MGA) targets: reducing electricity use by 2% annually and sourcing 30% of electricity from renewables by 2030. Using a modified National Energy Modeling System (NEMS), the Union of Concerned Scientists finds that these goals are achievable and would lead to significant job creation, consumer savings, and carbon emission reductions. The analysis highlights wind and biopower as the most competitive resources, while noting that transmission capacity remains a primary barrier. The report argues that regional targets would complement a federal carbon policy, making such a policy more affordable for consumers.