Utility-scale Wind Energy Research Articles

Jet engines, wind turbines, and AI: community reactions to new sounds

When jet engine-powered commercial aircraft started flying in and out of airports in the mid-20th century, surrounding communities-often in rural areas-were exposed to unprecedented sound levels. A straight line can be drawn from the reactions of those communities to today's Federal Aviation Administration (FAA) airport acoustical requirements. Community reactions to utility-scale wind energy facilities in the late 20th and early 21st centuries led to a bevy of local legislation around the United States, some of which has been insightful and helpful. More recently, society's ever-increasing demand for bits and bytes is introducing suburban areas to data centers-campuses of multi-story buildings requiring access to high volumes of cool air, fast Internet connections, and megawatts of electricity. Community reactions to the resulting environmental sound levels are again driving regulation and legislation. In all these cases, community reactions have driven the narrative. Instead of responding to community reactions, the noise control engineering community and their clients could be more proactive-the professionals could lead the narrative. Ideas about how to achieve this level of proactivity are discussed.

A Combined Ranking and Sensitivity Analysis of Power Generation Using Multi-Criteria Decision-Making and Monte-Carlo Simulation

This research examined energy sources that can be employed in a region to assist policymakers in determining energy priorities. Three key components were analyzed in this research to rank these energy sources: Levelized Cost of Energy (LCOE), CO2 emissions, and power density. A combination of multi-criteria decision-making (MCDM) methods, namely the Analytical Hierarchy Process (AHP)-Entropy-the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS), was used to assess these criteria, which had not been previously applied to rank energy sources. Additionally, the Monte-Carlo method was utilized to detect changes in sensitivity throughout the rankings. Results of the study indicated that gas energy topped the list, followed by Solar Photovoltaic (PV)-crystalline, geothermal, wind, nuclear, Solar PV Commercial & Industrial (C&I), Solar Thermal Tower with Storage, and residential PV rooftop solar. Moreover, nuclear energy ranked the highest when looking at the sensitivity of parameters, while utility-scale Solar PV and wind energy ranked the next highest. Thus, this research can be used to increase objectivity in the assessment and selection of power generation technology to be implemented.

Projected wind and solar energy potential in the eastern Mediterranean and Middle East in 2050

The ongoing energy transition from conventional fuels to renewable energy sources (RES) has given nations the potential to achieve levels of energy self-sufficiency previously thought unattainable. RES in the form of utility-scale solar and wind energy are currently the leading alternatives to fossil-fuel generation. Precise location siting that factors in efficiency limitations related to current and future climate variables is essential for enabling the green energy transition envisioned for 2050. In this context, understanding and mapping the intermittency of RES provides insights to energy system operators for their seamless integration into the grid. The Eastern Mediterranean and Middle East (EMME) region has the potential to harness vast amounts of RES. The scarcity of observations from weather station networks and the lack of private sector incentives for transitioning to RES mean that relevant, supporting weather and climate studies have been limited. This study employs the Weather Research and Forecasting model with Chemistry (WRF-CHEM) to estimate the RES technical potential of EMME countries and map the hourly generation profiles per source and country, simulated for the reference year 2015 and considering future conditions. The findings indicate that by 2050, seven countries within the region could transform into net energy exporters, while the remaining nine might remain reliant on energy imports or fossil fuels. Egypt emerges as a “powerhouse”, potentially enjoying a potential surplus energy generation of 76 GW per hour, whereas the United Arab Emirates may face an annual deficit of 955 TWh. Further, we derived the hourly generation profiles for wind and solar during different seasons. Four dominant patterns were identified. We find a complementary relationship for six countries, and for four countries, a substitute relationship between solar and wind energy generation. Greece stands out with a near-constant wind energy source, which would facilitate its integration into the national grid.

Design and Performance Analysis of a Grid-Connected Distributed Wind Turbine

The utilization of wind energy has become increasingly popular in the United States and many European countries due to its abundant nature and optimized design. While existing wind turbines are predominantly large-scale and not suitable for standalone or distributed power production, Lubbock County in West Texas offers a diverse range of renewable energy options to meet its energy needs. The region relies heavily on utility-scale wind energy sources to supply power to the Texas Grid, replacing conventional fossil fuel-based systems. Currently, standalone solar PV systems are the preferred choice for renewable energy generation. However, West Texas possesses an ample supply of wind energy that can be harnessed to establish a microgrid and provide standalone power to rural communities. Distributed wind energy offers localized power generation, reducing transmission losses and grid strain, while conventional wind farms require long-distance transmission, leading to efficiency gains. By employing the latest technology and optimizing efficiency, even in low-scale generation, a 6-kilowatt permanent magnet alternator-based distributed wind turbine has been designed. This paper focuses on analyzing the techno-economic aspects of implementing this wind turbine in a real-world scenario, taking into account wind attributes, such as velocity and available power, at the specific location.

Sources of opposition to renewable energy projects in the United States

Many policy analysts believe that once electricity from renewable energy becomes less expensive than electricity from fossil fuel, new renewable energy facilities will be built quickly across the United States. Cost-effective renewable energy has largely been achieved, but there appear to be substantial barriers to building new renewable energy facilities. We identified 53 utility-scale wind, solar, and geothermal energy projects that were delayed or blocked between 2008 and 2021 in 28 U.S. states. Using multi-level qualitative analysis, we have identified seven key sources of opposition. Of the projects we studied, 34% faced significant delays and difficulties securing permits, 49% were cancelled permanently, and 26% resumed after being stopped for several months or years. Project delays and cancellations account for potential lost generating capacity of almost 4600 MW. State and local governments and renewable energy developers need to pay closer attention to the full range of socially-oriented sources of opposition to new facilities.

“After the leases are signed, it's a done deal”: Exploring procedural injustices for utility-scale wind energy planning in the United States

Expanding wind energy deployment to meet climate and policy goals requires willing communities to host wind projects. Wind power acceptance is inextricably linked to perceptions of projects' planning process, but it is less understood what makes wind planning processes more or less fair. Using a mixed-methods case study research design, this paper evaluates the planning process for two state-approved wind farms in Ohio and Minnesota using four analytical themes relating to procedural justice: participation, information, decision-making, and local context. In doing so, we provide one of the few detailed mappings of a United States wind farm planning process. Our findings confirm other results in the wind planning literature, particularly with respect to the limited opportunities for participation and decision-making input afforded to the public. However, our study also argues that to realize procedural justice in utility-scale wind project planning, planning processes need to evolve to: (1) afford non-compensated neighbors of wind projects similar information and participation opportunities as compensated landowners, (2) provide additional resources for and knowledge-sharing opportunities among local (county and township) governments, (3) create structures for participation, information provision, and decision-making surrounding wind farm construction, operation, and decommissioning (not just siting), and (4) consider local contexts of historical power generation and resident connections to the land.

Farmers vs. lakers: Agriculture, amenity, and community in predicting opposition to United States wind energy development

Utility-scale wind energy is now the largest source of renewable electricity in the US. Wind energy’s continued growth remains contingent upon finding adequate resource potential and transmission capacity, along with communities willing to host turbines. While previous research on the social acceptance of wind has relied predominantly on case studies, resident surveys, and reviews of development practices and strategies, here we use a new method. We use a wind contention survey of energy professionals (n = 46) to assess the contention associated with 69 existing wind farms in four US Midwest states and identify underlying characteristics, i.e., agricultural, land-use, and demographic characteristics, that may have predisposed communities to either support or oppose wind farm development. We then use publicly available data to parameterize and model those characteristics using wind farm contention as our dependent variable. Our analysis shows that a greater proportion of production-oriented farming and fewer natural amenities in a community are associated with reduced opposition to wind farm development. Additionally, and perhaps counterintuitively, communities with a greater percentage of residents that voted Republican in the 2016 Presidential election demonstrate less opposition. Rather than negating the need for employing best practices in community engagement, stakeholder development, and participatory decision-making processes, this study can help prepare developers for the type of reception that might await them in potential host communities.

Ultrasonic acoustic deterrents significantly reduce bat fatalities at wind turbines

Wind turbines are known to cause bat fatalities worldwide. Ultrasonic acoustic deterrents are a potential solution to reduce impacts on bats, but few experimental field studies have been conducted at utility scale wind energy facilities. Our objective was to assess effectiveness of a recently developed deterrent for reducing bat fatalities at wind turbines in southern Texas, USA. We quantified fatalities at control (deterrents off) and treatment (deterrents on) wind turbines from 31 July through 30 October in 2017 and 2018, and assessed deterrent effectiveness using generalized linear mixed models. Our results indicate deterrents significantly reduced bat fatalities for Lasiurus cinereus and Tadarida brasiliensis by 78% and 54%, respectively. We observed no significant reduction in fatalities for other species in the genus Lasiurius. Thus, deterrents represent a potential impact reduction strategy for some bat species, but research is still warranted to improve species-specific effectiveness.

,,,Dust in the Wind:1 Regulation as an Essential Component of a Sustainable and Robust Wind Program

The promise of alternative energy has not yet reached its full potential, in part due to a lack of political will as well as a failure to dedicate regulatory resources. Individual and community efforts to maximize alternative fuel sources have resulted in equal parts under-realized promise and unreasonable critiques. As the impending threat of climate change looms, activists and politicians alike realize the increasing urgency to reduce America’s use of fossil fuels. Yet, any energy solution aiming to find an alternative in wind, solar, biomass, and hydropower will be handicapped by the lack of the very infrastructure and regulation that supports traditional energy. A prime example of this is the wind energy industry. Over the past twenty years, utility-scale wind energy emerged in a regulatory vacuum. Wind farms emerged on the Kansas, Texas, and Oklahoma plains, and in the California hills. Despite the beauty of the spinning turbines on the High Plains, known as the Llano Estacado , these turbines nonetheless create ecological impacts. Operating in a regulatory vacuum, renewable energy visionaries, businesspeople, and developers forged ahead to refine the technology, leaving wildlife, tribes, and nearby residents alone to absorb the unintended consequences alone. As a result, “green on green” lawsuits have begun, as environmental activists and industry opponents begin to question the value of this alternative energy source. This Article takes the position that wind energy is desirable and an important part of a diversified energy portfolio. An increased level of regulation is necessary to prevent the drawbacks of wind energy from undermining the growth in the sector. Indeed, regulation is necessary to have a sustainable wind program, and to support growth in the renewable energy sector.

Local benefits factored in utility scale wind energy for a remote location

Abstract The publication presents the results of analysis of possible local benefits factored in utility scale wind energy for a remote location. Electricity is one of the most vital problems on the Earth, thus utility scale wind and solar energy devices are boosting economic development. Energy demand is constantly increasing, despite efforts to ensure the energy efficiency of devices. People are looking for more energy and electricity to consume. Although wind energy is still being researched and improved, modern generation of wind energy is becoming more and more effective and desirable. This publication presents an effective solution to this issue. It deals with the generation of green environment friendly electricity from wind turbine. The genuine idea is to provide energy for remote location using onshore wind turbines. An analysis of the demand for energy at a remote location and electricity consumption was made to provide preliminary calculations of the wind farm. The number of required turbines is determined taking into account all related factors. A specific wind turbine has been selected and proposed to provide the necessary location with the necessary amount of energy. The analysis carried out showed that the produced energy is environment friendly since there is no carbon dioxide emission.

Wind Resource Assessment for Alaska’s Offshore Regions: Validation of a 14-Year High-Resolution WRF Data Set

Offshore wind resource assessments for the conterminous U.S. and Hawai’i have been developed before, but Alaska’s offshore wind resource has never been rigorously assessed. Alaska, with its vast coastline, presents ample potential territory in which to build offshore wind farms, but significant challenges have thus far limited Alaska’s deployment of utility-scale wind energy capacity to a modest 62 MW (or approximately 2.7% of the state’s electric generation) as of this writing, all in land-based wind farms. This study provides an assessment of Alaska’s offshore wind resource, the first such assessment for Alaska, using a 14-year, high-resolution simulation from a numerical weather prediction and regional climate model. This is the longest-known high-resolution model data set to be used in a wind resource assessment. Widespread areas with relatively shallow ocean depth and high long-term average 100-m wind speeds and estimated net capacity factors over 50% were found, including a small area near Alaska’s population centers and the largest transmission grid that, if even partially developed, could provide the bulk of the state’s energy needs. The regional climate simulations were validated against available radiosonde and surface wind observations to provide the confidence of the model-based assessment. The model-simulated wind speed was found to be skillful and with near-zero average bias (−0.4–0.2 m s−1) when averaged over the domain. Small sample sizes made regional validation noisy, however.

Utility-scale wind energy development challenges in Pennsylvania, 2018

abstract The Pennsylvania Utility Commission (PUC) requires that 18% of electricity supplied in Pennsylvania come from an alternative resource by the year 2021. At present, the PUC reports that 14.2% of electricity comes from such sources and that the state is on track to meet its targets by 2021. Wind energy plays a significant role in attaining these standards. In the 2017 Alternative Energy Portfolio Standards Annual Report, wind power contributed to 46.9% of the Tier 1 credits retired in 2017. Although wind plays an important role, future development of utility-scale wind projects in Pennsylvania has significantly declined. In the last five years, only one new wind farm has come on line, and the oldest wind farm in Pennsylvania has been decommissioned. This research provides information regarding the challenges and issues related to the dearth of new utility-scale wind farms in Pennsylvania. This paper reviews the challenges and issues unique to the Commonwealth relating to community opposition, anti-wind ordinances, nonauthorizaton of public land use for wind projects, lack of supportive policy, and environmental issues related to birds and bats.

An Assessment of the Wind Power Generation Potential of Built Environment Wind Turbine (BEWT) Systems in Fort Beaufort, South Africa

The physical and economic sustainability of using built environment wind turbine (BEWT) systems depends on the wind resource potential of the candidate site. Therefore, it is crucial to carry out a wind resource assessment prior to the deployment of the BEWT. The assessment results can be used as a referral tool for predicting the performance and lifespan of the BEWT in the given built environment. To date, there is limited research output on BEWTs in South Africa, with available literature showing a bias towards utility-scale or conventional ground-based wind energy systems. This study aimed to assess the wind power generation potential of BEWT systems in Fort Beaufort using the Weibull distribution function. The results show that Fort Beaufort wind patterns can be classified as fairly good and that BEWTs can best be deployed at 15 m for a fairer power output as roof height wind speeds require BEWTs of very low cut-in speeds of at most 1.2 ms − 1 .

Integration of buoyancy-based energy storage with utility scale wind energy generation

This paper presents concepts and considerations for integrating a Buoyancy Energy Storage System with a utility scale wind turbine and the Ontario, Canada energy market is used as a case study. Using derived characteristic equations of operation, a Buoyancy energy system is sized for storage of 1MWh of electrical energy. Practical considerations of float and equipment selection are discussed and hydrodynamic drag losses calculated for the desired float velocity range. Round-trip efficiency is estimated based on calculated losses. Power generation data from a 2.3MW wind turbine is presented along with the historic energy purchase price data for Ontario in 2015. Total revenue and net revenue resulting from storage is calculated based on historic data and a developed bi-diurnal storage program. Open water testing of a small scale system was conducted in Lake Huron which confirmed steady state operation of the system under sufficient loading

Input–output life cycle environmental assessment of greenhouse gas emissions from utility scale wind energy in the United States

Wind energy is an emerging source for renewable energy. This article presents an application of the economic input–output life cycle assessment (EIO-LCA) to estimate the greenhouse gas (GHG) emissions through the life cycle of wind energy farms in a state. The EIO-LCA incorporates manufacturing, installation, operation and maintenance, and decommissioning of the wind turbine over its life cycle period. In doing so, the study demonstrates that O&M and decommissioning of infrastructure with a longer life period can be considered to assess the total environmental impacts. The life cycle costs of wind turbine installation in Indiana is used in this study. The uncertainty in wind energy production, and hence the variability in GHG emission intensities in metric tons per gigawatt hour (GWh), is demonstrated by using the Monte Carlo simulation. The research finds that wind energy production is not entirely GHG emission-free if all the costs and life cycle stages are considered. Emission estimates have uncertainty, and O&M and decommissioning can add up to 200 metric tons of GHG emissions in CO2e per wind turbine life cycle. The regional EIO-LCA can be a helpful tool to determine strategies for state compliance to initiatives, such as the Clean Power Plan.

An Observational, Spatially Explicit, Stability-Based Estimate of the Wind Resource off the Shore of North Carolina

AbstractAs part of ongoing studies of the feasibility of utility-scale wind energy off the shore of North Carolina, winds at 80-m elevation are estimated with a stability-based height-adjustment scheme. Data sources are level-3 daily Advanced Scatterometer (ASCAT) 10-m wind fields as measured by the MetOp-A satellite, North American Regional Reanalysis (NARR) estimates of near-surface atmospheric temperature and humidity, and the National Climatic Data Center’s optimally interpolated Advanced Very High Resolution Radiometer (AVHRR-OI) sea surface temperature (SST). A height-adjustment assuming neutral atmospheric stability provides reference conditions. The SST from AVHRR-OI was more accurate than SST from NARR and was used with NARR atmospheric data to represent atmospheric stability in the study region. The 5-yr average of the ASCAT 10-m winds is 6.5–9.0 m s−1 off the shore of North Carolina, with the strongest winds found over the Gulf Stream. Neutral-scheme 80-m wind speeds are 7.5–10.5 m s−1 and follow the same spatial pattern. The stability-based scheme produces an 80-m wind field with significantly different spatial wind patterns, with greater wind speeds than the neutral scheme in coastal regions where stable atmosphere conditions occur and lesser wind speeds than the neutral scheme farther offshore where unstable conditions are prevalent. The largest differences between the schemes occur in winter and spring when and where stable atmospheric conditions are most common. Estimated power inshore from the 100-m isobath with the neutral scheme yields average values of 400–800 W m−2, whereas the stability-based-scheme values are 600–800 W m−2. Capacity factors vary between 30% and 55%, with values in excess of 40% common in coastal areas off North Carolina.

Turbines and Terrestrial Vertebrates: Variation in Tortoise Survivorship Between a Wind Energy Facility and an Adjacent Undisturbed Wildland Area in the Desert Southwest (USA).

With the recent increase in utility-scale wind energy development, researchers have become increasingly concerned how this activity will affect wildlife and their habitat. To understand the potential impacts of wind energy facilities (WEF) post-construction (i.e., operation and maintenance) on wildlife, we compared differences in activity centers and survivorship of Agassiz's desert tortoises (Gopherus agassizii) inside or near a WEF to neighboring tortoises living near a wilderness area (NWA) and farther from the WEF. We found that the size of tortoise activity centers varied, but not significantly so, between the WEF (6.25 ± 2.13 ha) and adjacent NWA (4.13 ± 1.23 ha). However, apparent survival did differ significantly between the habitat types: over the 18-year study period apparent annual survival estimates were 0.96 ± 0.01 for WEF tortoises and 0.92 ± 0.02 for tortoises in the NWA. High annual survival suggests that operation and maintenance of the WEF has not caused considerable declines in the adult population over the past two decades. Low traffic volume, enhanced resource availability, and decreased predator populations may influence annual survivorship at this WEF. Further research on these proximate mechanisms and population recruitment would be useful for mitigating and managing post-development impacts of utility-scale wind energy on long-lived terrestrial vertebrates.

Probing wind-turbine/atmosphere interactions at utility scale: Novel insights from the EOLOS wind energy research station

Despite major research efforts, the interaction of the atmospheric boundary layer with turbines and multi-turbine arrays at utility scale remains poorly understood today. This lack of knowledge stems from the limited number of utility-scale research facilities and a number of technical challenges associated with obtaining high-resolution measurements at field scale. We review recent results obtained at the University of Minnesota utility-scale wind energy research station (the EOLOS facility), which is comprised of a 130 m tall meteorological tower and a fully instrumented 2.5MW Clipper Liberty C96 wind turbine. The results address three major areas: 1) The detailed characterization of the wake structures at a scale of 36×36 m2 using a novel super-large-scale particle image velocimetry based on natural snowflakes, including the rich tip vortex dynamics and their correlation with turbine operations, control, and performance; 2) The use of a WindCube Lidar profiler to investigate how wind at various elevations influences turbine power fluctuation and elucidate the role of wind gusts on individual blade loading; and 3) The systematic quantification of the interaction between the turbine instantaneous power output and tower foundation strain with the incoming flow turbulence, which is measured from the meteorological tower.

Assessing the state of knowledge of utility-scale wind energy development and operation on non-volant terrestrial and marine wildlife

A great deal has been published in the scientific literature regarding the effects of wind energy development and operation on volant (flying) wildlife including birds and bats, although knowledge of how to mitigate negative impacts is still imperfect. We reviewed the peer-reviewed scientific literature for information on the known and potential effects of utility-scale wind energy development and operation (USWEDO) on terrestrial and marine non-volant wildlife and found that very little has been published on the topic. Following a similar review for solar energy we identified known and potential effects due to construction and eventual decommissioning of wind energy facilities. Many of the effects are similar and include direct mortality, environmental impacts of destruction and modification of habitat including impacts of roads, and offsite impacts related to construction material acquisition, processing and transportation. Known and potential effects due to operation and maintenance of facilities include habitat fragmentation and barriers to gene flow, as well as effects due to noise, vibration and shadow flicker, electromagnetic field generation, macro- and micro-climate change, predator attraction, and increased fire risk. The scarcity of before-after-control-impact studies hinders the ability to rigorously quantify the effects of USWEDO on non-volant wildlife. We conclude that more empirical data are currently needed to fully assess the impact of USWEDO on non-volant wildlife.

Nesting Ecology of a Population of Gopherus agassizii at a Utility-Scale Wind Energy Facility in Southern California

We investigated the annual nesting ecology of a population of Desert Tortoises (Gopherus agassizii) inhabiting a utility-scale renewable energy (USRE) facility in southern California and compared our results with populations inhabiting relatively undisturbed sites. In 2000, 15 radio-tracked females produced 29 clutches, and 24 nests were monitored to examine nest-site selection, nest predation, hatching success, date of emergence of hatchlings, and hatchling mass and carapace length. Overall, the nesting ecology of the population inhabiting the USRE facility was very similar to other populations of Desert Tortoises inhabiting relatively undisturbed habitats. Oviposition occurred from 12 May to 8 July, which was similar to other sites. Nest depths (11.1 cm), nest predation (12%), hatchling emergence date (7 August and 29 September), and hatchling morphometrics (i.e., MCL: 44.5 mm; mass: 23 g) were all within ranges reported in other populations. Unlike within other populations, we observed no relationship between hatchling size and either maternal body size or egg width. We found no evidence of females selecting for a particular burrow for oviposition of eggs based on environmental or anthropogenic variables. Most nests were located in or near burrows, and nest depth was greater for nests near the entrance than those deeper in the burrow. Although this study suggests that the nesting ecology of the Desert Tortoise population we studied was not adversely affected by the USRE facility, this relationship is only correlative because our study was not a before-after-control-impact (BACI) study, which would establish a cause and effect relationship. As pointed out in a recent review, BACI studies are critically needed to address the wildlife impacts of utility-scale renewable energy development.