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Berkeley Lab’s “Utility-Scale Solar, 2024 Edition” presents analysis of empirical plant-level data from the U.S. fleet of ground-mounted photovoltaic (PV), PV+battery, and concentrating solar-thermal power (CSP) plants with capacities exceeding 5 MWAC (PV plants of 5 MWAC or less, including residential rooftop systems, are covered separately in Berkeley Lab’s companion annual report, Tracking the Sun).Key findings from this year’s report include:-18.5 GWAC of new utility-scale PV capacity came online in 2023, bringing cumulative installed capacity to more than 80.2 GWAC across 47 states.Installed costs continued to fall in 2023. Relative to 2022, capacity-weighted averages decreased by 8% to -$1.43/WAC (or $1.08/WDC). Costs, based on a 7.1 GWAC sample of 76 plants completed in 2023, have fallen by 75% (averaging 10% annually) since 2010.Plant-level capacity factors vary widely, from 6% to 36% (on an AC basis), with a sample median of 24%.-Levelized cost of energy (LCOE) of new 2023 projects increased slightly to $46/MWh prior to the application of tax credits but continued to fall to $31/MWh when accounting for federal incentives.PPA prices have largely followed the decline in solar’s LCOE over time, but newly signed longer-term PPA prices have increased since 2021, to an average of $35/MWh (levelized, in 2023 dollars). -Solar’s average energy and capacity value (i.e., ability to offset costs of other power generation sources) across the U.S. was $45/MWh in 2023. Solar’s average market value was lowest in CAISO ($27/MWh), the market with the greatest solar generation share, and highest in ERCOT ($67/MWh).-Newer solar projects had greater market value in 2023 than their generation costs, yielding $1.1 billion in benefits. Projects built in 2022 delivered on average $15/MWh more market value than their costs in 2023.-Solar’s combined value from wholesale electricity markets, public health and climate damage reduction were greater than generation costs and incentives, yielding $13.7 billion in net benefits in 2023. We estimate U.S. health benefits of $24/MWh and reduced global climate damages of $101/MWh.-Adding battery storage is one way to increase the value of solar. Deployment of 52 new PV+battery hybrid plants set a record with 5.3 GW installed in 2023. Our public data file tracks metadata and PPA prices from more than 100 PV+battery hybrid projects that are already online or that have secured offtake arrangements.-Looking ahead, a massive pipeline of at least 1,085 GW of solar capacity dominates the nation’s interconnection queues at the end of 2023. Nearly 571 GW, or 53%, of that total was paired with a battery – in CAISO it was a staggering 98%. Historically only 10% of the requested solar capacity is built.-For more information, and to explore related interactive data visualizations, go to utilityscalesolar.lbl.gov.

Improving battery technology and the growth of variable renewable generation are driving a surge of interest in “hybrid” power plants that combine, for example, wind or solar generating capacity with co-located batteries. While most of the current interest involves pairing photovoltaic (PV) plants with batteries, other types of hybrid or co-located plants with wide-ranging configurations have been part of the U.S. electricity mix for decades.This annually updated briefing tracks and maps existing hybrid or co-located plants across the United States while also synthesizing data from power purchase agreements (PPAs) and generation interconnection queues to shed light on near- and long-term development pipelines. The scope includes “co-located hybrids” that pair two or more resources (e.g., multiple types of generation and/or generation with storage) that are operated largely independently behind a single point of interconnection, and “full hybrids” that also feature coordinated operations of the co-located resources. The focus is on plants with one megawatt (MW) or more of capacity; smaller (often behind-the-meter) projects are also increasingly common, but are not included in this data synthesis.Key findings from the latest briefing include:-At the end of 2023, there were 469 hybrid plants (>1 MW) operating across the United States (+21% compared to the end of 2022), totaling nearly 49 GW of generating capacity (+19%) and 3.6 GW/11.1 GWh of energy storage (+59%/+67%). PV+storage plants are by far the most common, dominating in terms of plant number (288), storage capacity (7.8 GW/24.2 GWh), storage:generator capacity ratio (54%), and storage duration (3.1 hours). But there are nearly twenty other hybrid plant configurations as well, including several different fossil hybrid categories (each dominated by the fossil component) as well as wind+storage, wind+PV, wind+PV+storage, geothermal+PV, and others.-Last year was another strong year for PV+storage hybrids in particular: 66 of the 80 hybrids added in 2023 were PV+storage. As of the end of 2023, there was roughly as much storage capacity operating within --PV+storage hybrid plants as in standalone storage plants (~7.5 GW each). In storage energy terms, however, PV+storage edged out standalone storage by ~7 GWh (24.2 GWh vs. 17.5 GWh, respectively).-Interconnection queue data show continued strong developer interest in hybridization. At the close of 2023, there were 18% more hybrid plants—representing 33% more generating capacity—in interconnection queues across the United States than there were at the end of 2022. Solar dominates these proposed plants as well: at the close of 2023, there were 599 GW of solar capacity proposed as a hybrid (representing ~55% of all solar capacity in the queues), most typically pairing PV with battery storage. At the same time, there were 51 GW of wind capacity proposed as a hybrid (representing ~14% of all wind capacity in the queues), again most-often pairing wind with storage. Meanwhile, more than half of all storage in the queues is estimated to be part of a hybrid plant. While many of the plants proposed in the queues will not ultimately reach commercial operations, the depth of interest in hybrid plants—especially PV+storage—is notable, particularly in certain regions. For example, in CAISO, 98% of all solar capacity and 34% of all wind capacity in the queues is proposed as a hybrid.-The report also surveys power purchase agreement (PPA) price data from a sample of operating and proposed PV+storage plants. PV+storage PPA prices have begun to increase, and “levelized storage adders” have recently increased as well to ~$10000/MW-month, ~$80/MWh-stored (assuming one full cycle per day), or ~$35/MWh-PV. Some of the recent price increase could simply reflect a trend towards higher battery:PV capacity ratios on the mainland over time (whereas this ratio is typically pegged at 1 to 1 in Hawaii), which will increase costs, all else being equal. The well-publicized impact of inflationary and supply chain pressures on prices in 2022 could also be a short-term contributor, though battery prices have more recently hit all-time lows.For further details on these and other findings, please refer to the short PowerPoint-style briefing, which can be downloaded here. The briefing is accompanied by two data visualizations, one focused on online plants and the other on those in interconnection queues, as well as an Excel data file with details on individual plants.

Berkeley Lab's 2024 edition of its Land-Based Wind Market Report provides an updated overview of data and trends in land-based wind energy in the U.S. Though 2023 was a relatively slow year for new wind power deployment, wind continues to see technological advancements, solid performance, and attractive prices. The Inflation Reduction Act promises new market dynamics in the years ahead, with expanded domestic manufacturing capability and an anticipated resurgence in deployment. Key highlights of the new report include:Wind comprises a significant share of electricity supply. U.S. wind power deployment was relatively low in 2023, totaling 6.5 gigawatts (GW) and representing $10.8 billion in investment. Yet wind energy contributed 10% of the nation’s electricity supply, and as much as 37% in the Southwest Power Pool. A total of 150 GW of wind was installed in the U.S. at the end of 2023. A record-high 366 GW of wind was seeking transmission interconnection.Wind turbines continue to get larger, expanding the market for wind energy. Improved plant performance over the last decades has been driven by larger turbines mounted on taller towers and featuring longer blades. In 2013, no turbines employed rotors that were 115 meters in diameter or larger, whereas 98% of newly installed turbines featured such rotors in 2023.Wind energy prices have risen but remain attractive for purchasers. Wind power purchase agreement prices have been drifting higher since about 2018, with a recent range from below $20/MWh to more than $40/MWh depending on region and other details. These prices, which are possible in part due to federal tax support, are similar to recent solar sales prices and to the projected future fuel costs of gas-fired generation.Wind’s value proposition includes grid and societal benefits. The value of wind in wholesale power markets is affected by the location of wind plants, their hourly output profiles, and how those characteristics correlate with real-time electricity prices and capacity markets. The market value of wind declined in 2023, following a drop in the price of natural gas. Wind also reduces power-sector emissions of carbon dioxide, nitrogen oxides, and sulfur dioxide. These reductions, in turn, provide public health and climate benefits that are larger than wind’s grid-system value. The combination of all three values ($183/MWh) significantly exceeded the levelized cost of wind energy in 2023.The Inflation Reduction Act has created renewed optimism for supply chain expansion. Domestic manufacturing of towers and nacelles was strong in 2023, while blade manufacturing has begun to rise after several years of decline. The Inflation Reduction Act contains, for the first time, production-based tax credits for domestic manufacturing of key wind components like nacelles, towers, and blades; it also extended the tax credit for wind deployment, inclusive of a 10% bonus for projects that meet domestic content requirements. Consequently, there have been at least 15 announcements of manufacturing facilities that plan to open, re-open, or expand to serve the land-based wind industry.Energy analysts project a resurgence of wind deployment in the years ahead. With a long-term extension of tax credits for wind energy along with opportunities for wind plants to earn two 10 percent bonus credits, analysts expect 2023 to be the low-point for wind deployment. Forecasts for wind deployment grow to an average over 15 GW/year from 2026 through 2028.

In 2023 additional electricity transmission would have provided the most value for links that crossed between grid interconnection regions in the United States (the Western Interconnection, the Eastern Interconnection, the Texas Interconnection) or crossed between system operator regions within the same interconnection. Many multi-interconnection or multi-region links had values of greater than $20/MWh, or up to $175 million/yr per 1 GW expanded transmission (subject to limits to the depth of the market at each side of the link). In contrast, many links within regions, or between regions in the northeast, had relatively low values in 2023, following the overall decline in wholesale electricity prices in 2023 compared with 2021-2022. The most valuable link in 2023, at $61/MWh, was between Texas and the Southwest. Multiple events in 2023 (high natural gas prices in the western U.S., and high summer temperatures in Texas and the Southwest) were observed to have driven this high value. Of particular note, high prices in Texas occurred at a largely distinct set of hours from high prices in the Southwest, helping to drive up the value of transmission in total and demonstrating significant value to both regions. This example demonstrates the unique value of transmission (compared to other solutions, such as building local generation resources) in delivering benefits to multiple regions given its ability to connect areas of the country that inevitably face differing circumstances.

BACKGROUND: Understanding nutritions role in multiple sclerosis (MS) can guide recommendations and intervention-based studies. OBJECTIVE: Evaluate the association between nutrition and pediatric-onset MS outcomes. METHODS: Prospective longitudinal multicenter study conducted as part of the US Network of Pediatric MS centers. Predictors were collected using a food screener estimating intake of various dietary food groups (e.g. dairy and fruits) and additional calculated indices (e.g. Healthy Eating Index (HEI)). Outcomes included time-from-enrollment to clinical relapse, new magnetic resonance imaging (MRI) T2 lesions, and Expanded Disability Status Scale (EDSS) increase. RESULTS: 353 children with MS were enrolled (mean ± SD age 15.4 ± 2.9, follow-up 3.9 ± 2.6 years). Multivariable analysis demonstrated that increased dairy by 50% of recommended intake was associated with increased relapse risk by 41% (adjusted hazard ratio (HR) 1.41, 95% CI 1.07-1.86), and risk of T2 progression by 40% (1.40, 1.12-1.74). Increased intake of fruit or vegetable above recommended, and every five-point HEI increase decreased relapse risk by 25% (0.75, 0.60-0.95), 45% (0.55, 0.32-0.96), and 15% (0.84, 0.74-0.96), respectively. No associations were found with EDSS. CONCLUSION: This work supports the influence of dietary intake on MS course, particularly with dairy intake. Future prospective study is required to establish causation.

Adoption of residential behind-the-meter solar photovoltaic-plus-storage systems (PVESS) is driven, in part, by customer demand for backup power. However, there is limited understanding of how these systems perform over a range of building stock conditions that will evolve with future efficiency and electrification trends, posing challenges for identifying optimal electric resiliency investments. This study quantifies how residential energy consumption impacts the capability of PVESS to provide home backup power during long-duration power interruptions. We model statistically representative distributions of the residential building stock and estimate storage sizes required to provide backup power as a series of building envelope efficiency, load flexibility, and electrification measures are applied. For the baseline building stock, median storage size requirements range from 10 kWh in temperate weather conditions to 90 kWh in hot climates for a 3-day power interruption. Applying energy efficiency and temperature set-point adjustments reduce storage size requirements by 2–45 kWh (16%–53 %). In hot locations, heat pump retrofits reduce median storage sizing by an additional 10–30 kWh while in cold locations, they drive 10–50 kWh of storage capacity increase. Our results suggest that bi-directional EV charging may be essential to enabling PVESS backup of heating and cooling, given their typically large kWh sizes.

INTRODUCTION: The evidence for spinal cord stimulation (SCS) has been criticized for the absence of blinded, parallel randomized controlled trials (RCTs) and limited evaluations of the long-term effects of SCS in RCTs. The aim of this study was to determine whether evoked compound action potential (ECAP)-controlled, closed-loop SCS (CL-SCS) is associated with better outcomes when compared with fixed-output, open-loop SCS (OL-SCS) 36 months following implant. METHODS: The EVOKE study was a multicenter, participant-blinded, investigator-blinded, and outcome assessor-blinded, randomized, controlled, parallel-arm clinical trial that compared ECAP-controlled CL-SCS with fixed-output OL-SCS. Participants with chronic, intractable back and leg pain refractory to conservative therapy were enrolled between January 2017 and February 2018, with follow-up through 36 months. The primary outcome was a reduction of at least 50% in overall back and leg pain. Holistic treatment response, a composite outcome including pain intensity, physical and emotional functioning, sleep, and health-related quality of life, and objective neural activation was also assessed. RESULTS: At 36 months, more CL-SCS than OL-SCS participants reported ≥50% reduction (CL-SCS=77.6%, OL-SCS=49.3%; difference: 28.4%, 95% CI 12.8% to 43.9%, p

Electric transmission system operators (ISOs, RTOs, or utilities) require projects seeking to connect to the grid to undergo a series of impact studies before they can be built. This process establishes what new transmission equipment or upgrades may be needed before a project can connect to the system and assigns the costs of that equipment. The lists of projects in this process are known as “interconnection queues”. The amount of new electric capacity in these queues is growing dramatically, with nearly 2,600 gigawatts (GW) of total generation and storage capacity now seeking connection to the grid (over 95% of which is for zero-carbon resources like solar, wind, and battery storage). However, most projects that apply for interconnection are ultimately withdrawn, and those that are built are taking longer on average to complete the required studies and become operational. Data from these queues nonetheless provide a general indicator for mid-term trends in developer interest.This annually updated briefing and data file compiles and analyzes interconnection queue data from all seven ISOs/RTOs alongside 44 non-ISO utilities, which collectively represent over 95% of the currently installed U.S. electric generating capacity.-The total capacity active in the queues is growing year-over-year, with over 1,570 GW of generation and an estimated 1,030 GW of storage capacity as of the end of 2023.-In total, over 1,480 GW of zero-carbon generating capacity is currently seeking transmission access. Solar (1,086 GW) accounts for the largest share of generation capacity in the queues. Substantial wind (366 GW) capacity is also seeking interconnection, 1/3 of which is for offshore projects (120 GW).-Solar and battery storage are – by far – the fastest growing resources in the queues. Combined, they account for over 80% of new capacity entering the queues in 2023.-Proposed fossil fuel generation much lower, with 79 GW of natural gas and 1.5 GW of coal currently proposed.-Hybrid projects (co-locating multiple generation and/or storage types) comprise a large – and increasing – share of proposed projects, particularly in CAISO and the non-ISO West. 571 GW of solar hybrids (primarily solar+battery) and 48 GW of wind hybrids are currently active in the queues. Over half of the battery storage capacity in the queues is paired with some form of generation (mostly solar).-However, much of this proposed capacity will not ultimately be built. Among a subset of queues for which data are available, only 19% of the projects (and 14% of capacity) seeking connection from 2000 to 2018 have been built as of the end of 2023.-Interconnection wait times are also on the rise: The typical duration from connection request to commercial operation increased from

How much should electric utilities pay to maintain a reliable electricity system? This paper describes an open-ended stated-preference experiment that generates estimates for how advanced notification impacts household willingness-to-pay (WTP) to avoid outages. We find positive and statistically significant WTP to avoid power outages of $10/kWh, consistent with the expectation that outages are costly to the residential sector. We find notification reduces the WTP, but the effects are not statistically significant. There is limited evidence that these results vary by income and wealth levels. Back-up power ownership is positively correlated with respondents’ WTP to avoid outages.

BACKGROUND AND OBJECTIVE: Prior Epstein-Barr virus (EBV) infection is associated with an increased risk of pediatric-onset multiple sclerosis (POMS) and adult-onset multiple sclerosis (MS). It has been challenging to elucidate the biological mechanisms underlying this association. We examined the interactions between candidate human leukocyte antigen (HLA) and non-HLA variants and childhood EBV infection as it may provide mechanistic insights into EBV-associated MS. METHODS: Cases and controls were enrolled in the Environmental and Genetic Risk Factors for Pediatric MS study of the US Network of Pediatric MS Centers. Participants were categorized as seropositive and seronegative for EBV-viral capsid antigen (VCA). The association between prior EBV infection and having POMS was estimated with logistic regression. Interactions between EBV serostatus, major HLA MS risk factors, and non-HLA POMS risk variants associated with response to EBV infection were also evaluated with logistic regression. Models were adjusted for sex, age, genetic ancestry, and the mothers education. Additive interactions were calculated using relative risk due to interaction (RERI) and attributable proportions (APs). RESULTS: A total of 473 POMS cases and 702 controls contributed to the analyses. Anti-VCA seropositivity was significantly higher in POMS cases compared to controls (94.6% vs 60.7%, p

Individualizing instruction is a time-consuming aspect of classroom practice. Testing multiple interventions, and monitoring each to see which is most effective for a student can be prohibitively time consuming. However, Brief Experimental Analysis (BEA) is an assessment procedure that can be used to quickly identify an intervention that is likely to be successful with an individual student. BEA provides teachers with a method to efficiently collect data and predict which intervention is most likely to be successful before a significant amount of time and resources are invested. The BEA process can be used with students at a variety of grade levels for the purpose of academic and behavior intervention. This paper describes how to implement BEA in reading with students with intellectual disabilities in order to prepare them for opportunities in postsecondary education. We will also discuss how to overcome hurdles that practitioners may experience implementing the process.

Social norms theory offers a useful frame for understanding student use of university counseling centers. This study found engagement in the forms of living and working on campus and estimation of how many students on campus are using the university counseling center was significantly associated with counseling center use. Students' estimation of other students' counseling center use also mediated the relationship between on-campus living and counseling center use. These results suggest a positive campus norm around counseling center use. Recommendations for how student affairs offices can encourage this norm are offered.