{"query_echo":{"q":"","filters":{"analysis_type":["reliability assessment"]},"warnings":[{"code":"facet_value_not_in_vocabulary","message":"Value 'reliability assessment' for facet 'analysis_type' is not in the controlled vocabulary."}]},"total":{"value":3,"relation":"eq"},"page":1,"page_size":20,"self":"https://climateinsightsdirectory.org/api/v1/search?analysis_type=reliability+assessment","stability":"beta","ai_marking":{"digital_source_type":{"uri":"http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia","name":"Created using Generative AI"},"notice":"Summary and key insights are generated using artificial intelligence."},"results":[{"id":"ucs-000903","url":"https://climateinsightsdirectory.org/document/ucs-000903","title":"Request for Information Regarding Maine Offshore Wind Renewable Energy and Economic Development Program","publisher":{"name":"Union of Concerned Scientists","organization":"union-of-concerned-scientists"},"document_type":"statement","language":"en","date_published":"2024-05-30","source_url":"https://ucs-documents.s3.amazonaws.com/clean-energy/Offshore-Wind-Reliability-Analysis-Muller-UCS.pdf","generator":"Climate Insights Directory","generated_fields":["summary","key_insights","climate_tags","geography_discussed","analysis_type"],"summary":{"text":"The Union of Concerned Scientists (UCS) recommends that Maine's offshore wind procurement process prioritize larger nameplate capacities to maximize grid reliability. Based on an analysis of winter seasons from 2000 to 2022, UCS found that offshore wind fleets of 1500 MW, 4000 MW, and 8000 MW could substantially reduce the number of days the New England grid faces elevated energy shortfall risk. The document argues that offshore wind is an ideal solution for winter reliability because its output typically increases during cold snaps, unlike fossil fuel supplies which are subject to global market volatility and import constraints.","ai_generated":true,"unit":"ucs-000903#summary","date_modified":"2026-10-23"},"key_insights":[{"text":"Analysis of 22 past winter seasons (2000-2022) shows that offshore wind fleets can drastically reduce the average number of days with elevated energy shortfall risk (demand above 350,000 MWh) from 60 days per season to 35 days with 1500 MW, 11 days with 4000 MW, and just two days with 8000 MW.","ai_generated":true,"unit":"ucs-000903#insight-1","date_modified":"2026-10-23"},{"text":"Offshore wind is characterized as an effective mitigation tool for winter energy shortfalls because its energy supply increases during winter and typically operates at above-average output during extreme cold, providing a stably priced, locally controlled resource.","ai_generated":true,"unit":"ucs-000903#insight-2","date_modified":"2026-10-23"},{"text":"Current mechanisms to ensure winter fuel security in New England, such as the Mystic Cost of Service Agreement and the Inventoried Energy Program, are expensive for ratepayers and vulnerable to global disruptions, having cost approximately $830 million over three winter seasons (2022-2025).","ai_generated":true,"unit":"ucs-000903#insight-3","date_modified":"2026-10-23"},{"text":"The deployment of offshore wind could eliminate the need for expensive and polluting oil-fired plants, specifically citing the 822 MW Wyman Station in Yarmouth, Maine, which is the state's largest power plant.","ai_generated":true,"unit":"ucs-000903#insight-4","date_modified":"2026-10-23"},{"text":"UCS recommends that the Maine Governor’s Energy Office (GEO) and the Public Utilities Commission (PUC) include reliability benefits and the avoided costs of alternative cold-weather energy supplies in their cost-benefit evaluations of offshore wind bids.","ai_generated":true,"unit":"ucs-000903#insight-5","date_modified":"2026-10-23"},{"text":"The risk of winter energy shortfalls is expected to increase in the coming decades due to the electrification of heating and transportation, which will drive higher overall power demand during winter.","ai_generated":true,"unit":"ucs-000903#insight-6","date_modified":"2026-10-23"}],"climate_tags":["offshore wind power","Grid balancing","power purchase agreement"],"geography_discussed":["Yarmouth","Massachusetts"],"frame_perspective":[],"analysis_type":["historical data analysis","policy recommendation","reliability assessment"]},{"id":"ucs-000715","url":"https://climateinsightsdirectory.org/document/ucs-000715","title":"Gas Malfunction Calling into Question the Reliability of Gas Power Plants","publisher":{"name":"Union of Concerned Scientists","organization":"union-of-concerned-scientists"},"document_type":"policy brief","language":"en","date_published":"2024-01","source_url":"https://www.ucs.org/sites/default/files/2024-01/Gas%20Malfunction_brief_1.8.pdf","generator":"Climate Insights Directory","generated_fields":["summary","key_insights","climate_tags","geography_discussed","analysis_type"],"summary":{"text":"The document examines the vulnerability of the US gas-fired power plant fleet to extreme winter and summer weather, noting that gas plants are the primary source of generation failures during major storms. It argues that current resource adequacy metrics overvalue gas reliability and recommends transitioning to probabilistic modeling, increasing transparency, and prioritizing renewables, storage, and demand-side solutions to ensure a resilient power grid.","ai_generated":true,"unit":"ucs-000715#summary","date_modified":"2026-10-23"},"key_insights":[{"text":"Natural gas plants are disproportionately susceptible to failures during extreme winter weather compared to other energy sources. In five major winter storm events since 2011, gas plants were the largest source of lost generating capacity, with cumulative failures more than twice those of the next most-impacted category.","ai_generated":true,"unit":"ucs-000715#insight-1","date_modified":"2026-10-23"},{"text":"Winter storm failures in gas plants are often caused by equipment freezing and mechanical/electrical issues, frequently occurring even when temperatures remain above the plants' minimum ambient temperature ratings. For Winter Storm Uri (2021), 81 percent of freeze-related outages occurred above these ratings, and for Winter Storm Elliott (2022), the figure was over 75 percent.","ai_generated":true,"unit":"ucs-000715#insight-2","date_modified":"2026-10-23"},{"text":"Gas plants are uniquely vulnerable to fuel supply disruptions because they typically do not store fuel on-site. Extreme cold can cause 'freeze-offs' in wells and pipelines; for instance, during Winter Storm Uri, Texas saw a 70 percent decrease in gas production, and the lower 48 states experienced a 28 percent decrease.","ai_generated":true,"unit":"ucs-000715#insight-3","date_modified":"2026-10-23"},{"text":"Extreme summer weather also threatens reliability through heat-induced derates and drought-driven water shortages. In Texas, between 2010 and 2015, one operator took 403 MW of gas capacity offline for nearly a year due to drought, and ERCOT has since identified over 10,000 MW of gas capacity as at risk from drought.","ai_generated":true,"unit":"ucs-000715#insight-4","date_modified":"2026-10-23"},{"text":"Current grid reliability metrics, such as installed capacity (ICAP) and unforced capacity (UCAP), are insufficient because they do not account for widespread, correlated outages. The document advocates for the use of effective load carrying capability (ELCC), a probabilistic measure that can better quantify the risks of correlated failures.","ai_generated":true,"unit":"ucs-000715#insight-5","date_modified":"2026-10-23"},{"text":"Weatherization and the ability to switch to on-site fuels like diesel are not comprehensive solutions. During Winter Storm Elliott, most plants that failed already had cold-weather preparedness plans, and diesel plants have also been found to underperform in cold weather.","ai_generated":true,"unit":"ucs-000715#insight-6","date_modified":"2026-10-23"},{"text":"Clean energy alternatives can provide superior reliability compared to gas. A PJM analysis showed the winter ELCC of offshore wind (68 percent) is higher than that of a gas combustion turbine (63 percent). Additionally, research suggests that an extra 10 GW of solar in Texas would have reduced the scale of rolling blackouts during Winter Storm Uri.","ai_generated":true,"unit":"ucs-000715#insight-7","date_modified":"2026-10-23"}],"climate_tags":["natural gas","Power system reliability","extreme weather event","Resource adequacy","renewable energy","energy storage","electric power transmission","offshore wind power","solar energy","demand-side management","virtual power plant","climate change","environmental justice","decarbonization"],"geography_discussed":["Texas","California"],"frame_perspective":[],"analysis_type":["policy brief","reliability assessment"]},{"id":"catf-001227","url":"https://climateinsightsdirectory.org/document/catf-001227","title":"Greenhouse Gas Emission Reductions From Existing Power Plants: Options to Ensure Electric System Reliability","publisher":{"name":"Clean Air Task Force","organization":"clean-air-task-force"},"document_type":"report","language":"en","date_published":"2014-05","source_url":"https://cdn.catf.us/wp-content/uploads/2019/10/21093241/tierney_report_electric_reliability_and_ghg_emissions.pdf","generator":"Climate Insights Directory","generated_fields":["summary","key_insights","climate_tags","geography_discussed","analysis_type"],"summary":{"text":"The report argues that EPA's regulation of greenhouse gas (GHG) emissions from existing power plants under Section 111(d) of the Clean Air Act will not jeopardize electric system reliability. Unlike the unit-specific MATS rule, Section 111(d) employs a 'cooperative federalism' model, allowing states to develop State Implementation Plans (SIPs) with significant flexibility. This includes 'inside the fence' options like heat-rate improvements and 'outside the fence' options such as emission-averaging, carbon budgets, and demand-side reductions. The author notes that current industry conditions—including low natural gas prices, underutilized natural-gas-fired combined-cycle (NGCC) capacity, flat electricity demand, and the growth of renewables—provide a buffer that supports reliable compliance. The report concludes that as long as EPA, states, and industry engage in timely planning, the regulatory framework provides sufficient latitude to maintain power system adequacy and security.","ai_generated":true,"unit":"catf-001227#summary","date_modified":"2026-10-23"},"key_insights":[{"text":"The regulatory framework of Section 111(d) of the Clean Air Act is fundamentally different from other EPA rules like the MATS rule because it uses a 'cooperative federalism' model that provides states with wide latitude in how they achieve emissions reductions through State Implementation Plans (SIPs).","ai_generated":true,"unit":"catf-001227#insight-1","date_modified":"2026-10-23"},{"text":"Compliance options for states are categorized as 'inside the fence' (engineering-based improvements at the unit level) and 'outside the fence' (system-wide changes in dispatch, demand, and market mechanisms).","ai_generated":true,"unit":"catf-001227#insight-2","date_modified":"2026-10-23"},{"text":"As of March 2014, approximately 3,084 existing electric utility steam generating units (EGUs) and NGCC units are likely to be affected by Section 111(d), representing about 532.4 GW of generating capacity, or 70 percent of U.S. fossil generating capacity.","ai_generated":true,"unit":"catf-001227#insight-3","date_modified":"2026-10-23"},{"text":"The report identifies that electricity demand has remained relatively flat, which provides 'breathing room' for the industry to manage changes in the generation mix without compromising reliability.","ai_generated":true,"unit":"catf-001227#insight-4","date_modified":"2026-10-23"},{"text":"The loss of zero-carbon nuclear generation due to economic pressures could increase CO2 emissions and pressure states to include mechanisms in their SIPs to retain these resources.","ai_generated":true,"unit":"catf-001227#insight-5","date_modified":"2026-10-23"},{"text":"The report argues that reliability concerns are misplaced because the industry has a proven track record of responding to environmental rules without causing system failures.","ai_generated":true,"unit":"catf-001227#insight-6","date_modified":"2026-10-23"},{"text":"Market-based 'outside the fence' approaches, such as tradable performance standards, are estimated to be significantly more cost-effective than purely engineering-based 'inside the fence' actions.","ai_generated":true,"unit":"catf-001227#insight-7","date_modified":"2026-10-23"}],"climate_tags":["greenhouse gas emissions","Power system reliability","coal-fired power station","carbon budget","emission trading","energy efficiency","renewable energy","nuclear power","demand-side management"],"geography_discussed":["World"],"frame_perspective":[],"analysis_type":["policy assessment","technical analysis","reliability assessment"]}]}