Zewen Ge^1,*, Jihui Liu², Shuai Yuan¹, Mufan Zhuang^3,*

Energy Engineering, Vol.123, No.8, 2026, DOI:10.32604/ee.2026.082217 - 12 July 2026

Abstract Limiting warming to the Paris temperature goals requires a rapid scale-up of low-carbon energy, yet recent experience suggests that deployment is increasingly shaped by delivery constraints rather than by technology cost trends alone. This review synthesizes peer-reviewed evidence on five constraints that repeatedly slow net-zero buildouts: lengthy approval and grid-connection processes; capital-intensive investment profiles that heighten sensitivity to the cost of capital and revenue risk; bottlenecks in critical minerals, processing, and manufacturing; social contestation and local governance that translate into siting exclusions, delays, and cancellations; and modeling traditions that can underrepresent these non-marginal frictions. Accordingly,… More > Graphic Abstract

Miftakhul Maulidina^*, Erna Daniati

Energy Engineering, Vol.123, No.8, 2026, DOI:10.32604/ee.2026.080751 - 12 July 2026

Abstract The global energy transition toward net-zero emissions requires the massive development of renewable energy infrastructure. However, the efficiency and safety of installations such as wind turbines, solar panels, and energy storage systems are highly dependent on subsurface physical characteristics. Neglecting geological structures such as active faults or corrosive zones, risks structural failure and electrical system malfunctions. This research proposes the use of the Very Low Frequency Electromagnetic (VLF-EM) method as a fast and non-destructive geophysical screening tool. This method utilizes low-frequency signals to map variations in subsurface electrical conductivity. Furthermore, the data were processed using… More >

Chuan Lin^*, Weixian Chen, Guangtao Hao^*

Energy Engineering, Vol.123, No.8, 2026, DOI:10.32604/ee.2026.080605 - 12 July 2026

Abstract Accurate building electricity load forecasting (BELF) can provide a regulatory basis for building energy management systems and promote the transition of buildings toward low-carbon and intelligent operation modes. However, building electricity load is influenced by historical loads, as well as outside environmental conditions such as humidity and temperature, which reduces the prediction accuracy of models. To tackle these challenges, this study presents a BELF model, which consists of a modal component grouping approach, grouped feature attention mechanism, and multi-scale residual depthwise convolution memory module. First, the modal component grouping method analyzes building electricity load in… More >

Franjo Pranjić^1,*, Doris Beljan², Primož Praper³, Matej Fike¹, Peter Virtič¹, Antun Pfeifer², Neven Duić^2,4

Energy Engineering, Vol.123, No.8, 2026, DOI:10.32604/ee.2026.080284 - 12 July 2026

Abstract This paper evaluates the role of aggregated demand-side flexibility from public buildings in supporting renewable energy integration and decarbonization of the Slovenian energy system. Using high-resolution monitoring data from over 100 public buildings and the H2RES energy system optimization model, two long-term scenarios are analyzed for the period 2020–2050: a reference scenario without public building flexibility and a flexibility scenario in which public building heat demand is electrified via heat pumps. The year 2020 is used as an internally consistent optimization reference for demand levels and technology availability, rather than as a statistical reconstruction of… More >

Md. Liton Hossain^1,*, Md. Zahid Ansary², Jiefeng Hu¹, Syed Islam¹, Maaspaliza Azri³, Norezmi Md. Jamal⁴

Energy Engineering, Vol.123, No.8, 2026, DOI:10.32604/ee.2026.079961 - 12 July 2026

Abstract Inverters play an essential and indispensable role in energy conversion within modern electrical power systems. Conventional two-level inverters (2LIs) have been widely adopted across industrial applications due to their simple structure and mature control strategies. However, 2LIs exhibit several limitations when interfacing with utility-scale grid systems, including higher harmonic distortion, increased switching stress, and reduced efficiency in high-voltage and high-power operations. Multilevel Inverters (MLIs) have emerged as a transformative solution, enabling high-voltage and high-power applications with improved efficiency and significantly lower harmonic distortion compared to traditional two-level configurations. This review investigates the broad range of… More >

Johannes D. Pelda^*, Sebastian Aichele, Dmitry Romanov, Stefan Holler

Energy Engineering, Vol.123, No.8, 2026, DOI:10.32604/ee.2026.079450 - 12 July 2026

Abstract The transformation of district heating systems in Germany is a central topic in energy and climate policy, given the 2045 climate neutrality targets. This study focuses on the main district heating system in the city of Göttingen in Germany, whose heat generation currently relies primarily on three Combined Heat and Power (CHP) plants subsidized under the German CHP Act, one wood chip boiler and two gas boilers. In 2025, the network’s heating demand amounted to 89 GWh, which was mainly covered by wood chips or biogas (41%) and natural gas (21%). This paper examines an… More > Graphic Abstract

Mohamed R. Aboelmagd^1,*, Ali Selim^1,2,*, Mamdouh Abdel-Akher¹

Energy Engineering, Vol.123, No.8, 2026, DOI:10.32604/ee.2026.079171 - 12 July 2026

Abstract To enable the integration of photovoltaic (PV) power into electrical grids, accurate predictions are vital. This study applies the Multistage Attention Neural Ordinary Differential Equation (MANODE) model, which combines Long Short-Term Memory (LSTM) networks, Temporal Convolutional Networks (TCN), and a two-stage attention mechanism to capture complex spatiotemporal patterns for PV power forecasting. The improved MANODE model is evaluated on three real-world datasets from PV stations in Egypt. Each dataset contains 12 feature parameters and spans an entire year. Comprehensive comparisons are conducted between the improved MANODE model and other neural network models, including one-layer and More >

Omar Ghoulam¹, Hind Talbi^1,2, Kamal Amghar¹, Hamza Faraji^3,*, Saloua Senhaji⁴, Ismael Driouch¹

Energy Engineering, Vol.123, No.8, 2026, DOI:10.32604/ee.2026.076813 - 12 July 2026

Abstract This study numerically investigates turbulent flow and thermal performance in evaporator tubes equipped with rectangular partitions positioned at different locations. Two configurations are analyzed: (A) partitions on the top wall, center of channel, and bottom wall, and (B) partitions on the bottom wall, center of channel, and top wall. In addition, we examine the effect of varying the positions of the obstacles (S=D2,S=D,S=5D4, andS=3D/2) and the inclination angle (θ=60∘, θ=75∘, θ=90∘, θ=105∘ and θ=120∘) of the detached obstacle relative to the walls, an innovative aspect that had not been addressed in previous studies. More >

Yurong Zhao, Daozhi Chen^*, Yu Yin^*

Energy Engineering, Vol.123, No.8, 2026, DOI:10.32604/ee.2026.075847 - 12 July 2026

Abstract In order to investigate the impacts of government policy and market environment on the development of renewable energy, this paper constructs a computable general equilibrium (CGE) model to simulate the impacts of policy scenarios, market scenarios and policy-market scenarios on renewable energy output and investment, energy structure, economy and environment based on China’s input-output extension table in 2020. The results show that: the subsidy can optimize the energy structure and power structure, and non-hydropower renewable energy represented by wind power and solar power will become a new force of energy supply in China; the market… More >

Xuefeng Yang^1,2, Chunyu Ren^1,2, Deliang Zhang^1,2, Huaicai Fan^1,2, Yue Chen^1,2, Yue Yang^1,2, Yan Zhang^1,2, Shuai Wu^1,2, Baoyun Zhang^3,*, Xin Zhao³

Energy Engineering, Vol.123, No.8, 2026, DOI:10.32604/ee.2025.074956 - 12 July 2026

Abstract In southern Sichuan’s deep shale gas development, multi-stage fractured horizontal wells are commonly used. Evaluating fracturing results is challenging due to complex fracture networks. This study classifies fracture systems into four types: single-wing, bi-wing, branched, and serial fractures. A discrete fracture model (DFM) combined with matrix-fracture flow is used to establish a single-stage well testing interpretation model. To address multi-solution issues in well testing, an equivalent fracture network model based on a trilinear flow model is proposed, adjusting crossflow coefficients and the fracture network volume ratio. The study finds significant differences in the pressure derivative More >