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Quantum Science and Technology

Frontiers in Quantum Science and Technology ·

Volume 4 - 2025 | https://doi.org/10.3389/frqst.2025.1653104

Quantum machine learning early opportunities for the energy industry: a scoping review

  • Francesco Strata1*corresponding author
  • Luca Migliori1
  • Nour Gebran1
  • Nicolina Guarino2
  • Giacomo Carlo Colombo1
  • Sara Pezzuolo1
  • Emiliano Luzietti1
  1. 11 Data & AI, PwC, Milan, Italy
  2. 22 Data & AI, PwC, Naples, Italy
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Abstract

Quantum computing innovations have garnered significant attention for their potential to revolutionize industries, with the energy sector being one of the most promising areas for application. As global energy demand increases and sustainability becomes more critical, computational technologies offer groundbreaking solutions for energy production, storage, and distribution. In this landscape, quantum computing plays a crucial role in unlocking the full potential of artificial intelligence and machine learning as research and development in the quantum machine learning field grows constantly. We here present a scoping review of early quantum machine learning applications within the energy industry value chain. Starting from 34 sources, we analyze and discuss 22 use cases in the energy sector, thoroughly examining each to understand its potential applications and impact. We then evaluate these early-stage quantum applications to determine their feasibility and benefits, offering insights into their relevance and effectiveness in the context of the industry’s evolving landscape. This is done by introducing a novel framework: the Assessment Model for Innovation Management (AMIM). Our research highlights the opportunities that quantum innovations present for the energy sector and offers actionable insights into which applications are the best investments and why. Overall, the feasibility and technological maturity of quantum machine learning use cases are still in the early stages, though their market compatibility and potential benefits are mostly relatively high. This indicates that while quantum machine learning holds immense potential, further development is necessary to fully realize its benefits in the energy sector.

Keywords

1 Introduction

The energy industry is undergoing a profound transformation, driven by the increasing complexity of power systems, the integration of decentralized renewable energy sources, growing global demand, and the imperative of decarbonization. These global challenges have become particularly central to strategic European Union (EU) initiatives such as the Green Deal (European Commission, 2019), which are then reinforced by the dynamics of liberalized energy markets and the need for resilient and sustainable operations (European Commission, 2023). In this context, data-driven technologies, particularly machine learning (ML) and artificial intelligence (AI), have become indispensable tools for functions such as demand forecasting, fault detection, and grid stability assessment.

As the reliance on ML grows, so does the demand for computational power. This is where quantum computing (QC) emerges as a potentially transformative technology. With its theoretical ability to outperform classical computing in complex workloads such as optimization and simulation (Grover, 1996; Shor, 1997; Farhi et al., 2001), QC offers a promising path forward. The field of quantum machine learning (QML) specifically addresses challenging mathematical problems to enhance ML tasks (Biamonte et al., 2017).

Although commercially available quantum workloads remain an open challenge, the rapid evolution of quantum hardware has enabled exploratory studies for near-term applications. With this in mind, this review adopts a scoping approach to investigate the emerging intersection of QML and the energy sector. We therefore formulated the following research questions.

  • 1. How can the energy and utilities sector benefit from QC, and which specific ML applications or challenges will QC address in the near-to-medium-term future?
  • 2. Which use cases of QML have the most significant impact on the energy and utilities sector related to their level of readiness?

To answer these questions, this review identifies, categorizes, and assesses early-stage QML applications that address real-world energy challenges. To provide a structured evaluation, we introduce a novel framework, the Assessment Model for Innovation Management (AMIM), which is designed to assess use cases based on their market readiness and potential benefits.

This study is structured to be accessible to a diverse audience. We begin with a condensed overview of the fundamental concepts of quantum computing (Section 2), classical machine learning (Section 3), and quantum machine learning (Section 4), with deeper technical details moved to an Appendix. The core of the paper follows, presenting the scoping review methodology and findings (Section 5). Finally, Section 6 introduces the AMIM framework and discusses the evaluation of the identified use cases, providing insights for innovation strategy in the energy sector.

2 Quantum computing fundamentals

A quantum computer uses quantum bits, or qubits, to store information and perform computations by harnessing principles of quantum mechanics like superposition and entanglement (National Academies of Sciences, Engineering, and Medicine, 2019). Unlike a classical bit (0 or 1), a qubit can exist in a superposition of both states simultaneously, represented as | ψ 〉 = α | 0 〉 + β | 1 〉, where | α | 2 + | β | 2 = 1. This allows a system of n qubits to explore a computational space of 2 n dimensions. Entanglement creates strong correlations between qubits, where measuring one instantaneously influences the others, regardless of distance. These properties give quantum computers their potential for immense computational power.

2.1 Technology outlook

Quantum technology holds great promise but faces challenges in scalability and error correction. Research is ongoing across various physical implementations, including superconducting, photonic, and trapped-ion qubits, with no single standard yet dominant. The journey toward practical application is often described in stages of quantum advantage.

  • 1. Quantum Utility: the current stage, where NISQ devices begin to provide valuable results for specific problems, even without a proven theoretical speed-up over classical methods (Kim et al., 2023).
  • 2. Quantum Advantage: expected around 2029–2030, where error-corrected quantum computers will consistently outperform the best classical computers on a range of commercially relevant problems (IBM, 2025; Google Quantum AI, 2025).
  • 3. Quantum Supremacy: the highest level, expected after 2030, where quantum computers can solve problems that are practically impossible for any classical computer.

Investing in QC R&D today is crucial for companies to build expertise and secure a competitive advantage in a future where computational resources may be scarce (Figure 1).

Impact of quantum computing technology on the predicted temporal evolution of offer-demand computational power curves. Today, quantum hardware demand is limited to experimental studies while we are entering the Quantum Utility era. Once full Quantum Advantage is virtually reached, there will be a severe turning point (TP), and demand is expected to grow much faster than offer. Even more so once quantum computers are fully mature, demand will just grow further. The time in which companies must wait for computational resources will likely increase, creating a significant competitive disadvantage for those unprepared. At the end of this lag, the market will settle, and demand and offer will match.
Figure 1. Impact of quantum computing technology on the predicted temporal evolution of offer-demand computational power curves. Today, quantum hardware demand is limited to experimental studies while we are entering the Quantum Utility era. Once full Quantum Advantage is virtually reached, there will be a severe turning point (TP), and demand is expected to grow much faster than offer. Even more so once quantum computers are fully mature, demand will just grow further. The time in which companies must wait for computational resources will likely increase, creating a significant competitive disadvantage for those unprepared. At the end of this lag, the market will settle, and demand and offer will match.

2.2 Types of hardware

Quantum computing hardware is broadly categorized into two models.

Analog quantum computing. This approach is a model of quantum computation in which a quantum system evolves continuously under a precisely controlled Hamiltonian, using the natural dynamics of quantum mechanics to directly simulate or solve problems. A prime example is quantum annealing, which involves smoothly evolving a quantum system towards a final state that encodes the solution to optimization problems. It takes advantage of the natural tendency of a quantum system to settle in its lowest energy state, which is designed to correspond to the optimal solution (Albash and Lidar, 2018). Machines designed thus, called “quantum annealers”, implement this adiabatic quantum process to find the ground state of a specific Hamiltonian, making them well-suited for specific optimization tasks that seek to maximize or minimize an objective function.

Digital gate-based quantum computing. This model is analogous to classical computing, manipulating qubits through a sequence of discrete and controllable quantum gates, also called “quantum processing units” (QPUs). This approach offers greater flexibility and universality, with the capability to address a wider range of problems, including those in machine learning (Ding et al., 2020). The current generation of these devices operates in the noisy intermediate-scale quantum (NISQ) era, meaning that they have a limited number of qubits (tens to a few hundreds) and are susceptible to errors from environmental noise and imperfect controls (Preskill, 2018).

2.3 Quantum error handling

A major challenge in the NISQ era is managing quantum errors, or decoherence. Three primary strategies are used.

  • • Error suppression: hardware-level techniques that proactively alter control signals to make quantum operations more robust against known sources of noise (Baum et al., 2021).
  • • Error mitigation: software-based methods that run an algorithm multiple times with slight variations and use statistical post-processing to estimate a noise-free result from noisy outputs (Giurgica-Tiron et al., 2020).
  • • Quantum error correction (QEC): creating fault-tolerant quantum computers by encoding information from a single “logical qubit” across many physical qubits. This redundancy allows for the detection and correction of errors without disturbing the computation (Shor, 1995). QEC is a great challenge in terms of advanced quantum engineering and remains a key area of research.

3 Machine learning fundamentals

Machine learning (ML) is a subfield of AI where algorithms learn patterns from data to make predictions or decisions. We will focus on techniques relevant to this review.

Supervised learning involves training a model on labeled data. One of the most popular tasks is regression, which is to predict continuous numerical values learning from past data. Another key task is classification, or learning how to assign inputs to predefined categories. An important classification model is the support vector machine (SVM), which finds an optimal hyperplane to separate classes. For nonlinearly separable data, SVMs use the kernel trick to map data into a higher-dimensional space where separation is possible.

Unsupervised learning works with unlabeled data to find hidden structures. A key model is the restricted Boltzmann machine (RBM), a generative neural network used for tasks like feature learning.

Reinforcement learning is a type of machine learning in which an agent learns to make decisions by interacting with an environment whose past data are in principle not available at all, receiving feedback in the form of rewards or penalties, and optimizing its actions to maximize cumulative reward over time.

Used broadly in each category of machine learning, artificial neural networks (ANNs) are brain-inspired models consisting of layers of interconnected nodes. Deep learning uses ANNs with many layers (deep architectures) to learn complex hierarchical features from data, excelling at tasks involving unstructured data such as images or time series. ANNs are trained using optimization algorithms like gradient descent to minimize the difference between predicted and true outputs.

4 Quantum machine learning

Quantum machine learning (QML) aims to leverage quantum computing to enhance ML tasks, either by processing classical data on a quantum computer or by analyzing quantum data. The primary advantage lies in using the vast Hilbert space of qubits for more powerful data representation and harnessing quantum algorithms for computational speedups (Biamonte et al., 2017).

Current QML research for NISQ devices is dominated by variational quantum algorithms (VQAs). These are hybrid quantum–classical algorithms in which a quantum computer executes a parameterized quantum circuit (an ansatz) and a classical computer optimizes these parameters to minimize a cost function. This process is analogous to training a classical neural network.

4.1 Quantum variational models

VQAs can be broadly categorized on the basis of how they use the quantum circuit.

  • • Explicit models (quantum neural networks), in which the output is a direct measurement of the quantum state produced by the circuit. This includes quantum neural networks (QNNs), which often use a layered structure with data re-uploading to increase their expressive power (Pérez-Salinas et al., 2020). The model parameters are tuned via a hybrid optimization loop. A key challenge in training these models is the “barren plateau” phenomenon where gradients can vanish, making optimization difficult. A technical discussion of this and mitigation strategies is provided in Appendix A.1.
  • • Implicit models (quantum kernels), which exclusively use the quantum computer to calculate a quantum kernel, which measures the similarity between data points in a quantum feature space (Schuld and Killoran, 2019). The kernel matrix is then fed into a classical algorithm, such as an SVM, for the final classification or regression task. This avoids the direct optimization of the parameters of a quantum circuit but can be computationally expensive as it requires comparing every pair of data points.
  • • Hybrid models simply combine the models from the previous two categories with other quantum-inspired or purely classical methods to form a hybrid architecture. One prominent example is hybrid neural networks, which mix classical neural layers with quantum data re-uploading.

Data are encoded into a quantum state using a feature map. Common methods include angle embedding and amplitude embedding. The mathematical details of these encoding strategies are available in Appendix A.2.

4.2 Quantum annealing for machine learning

Beyond gate-based models, quantum annealing is used to solve optimization problems inherent in some ML tasks. For example, it has been applied to feature selection, which can be framed as an optimization problem to find the most informative subset of features from a large dataset (Ferrari Dacrema et al., 2022). It is also used to train models such as RBMs by finding the optimal network weights that correspond to the minimum energy of an equivalent physical system (Dixit et al., 2021).

5 Case-based research in the energy sector

5.1 Rationale

Electricity is arguably the most important energy resource in modern society. Today, electricity operators face dual challenges: rising global demand and the urgent need to shift toward more sustainable and decarbonized processes. The adoption of new technologies such as AI and HPC is a key solution. QC is particularly interesting for its disruptive potential in the energy and utilities (E&U) industry, which is full of computational complexity, especially in forecasting and optimization problems. The focus of this review is on QML applications that can be practically assessed with today’s technology maturity, aiming to shed light on early opportunities for quantum technology adoption.

5.2 Methods and overview

To answer the research questions given in the introduction, we follow the PRISMA-ScR guidelines for scoping reviews (Tricco et al., 2018) (Figure 2). We searched Scopus, Web of Science, and Google Scholar using a comprehensive query combining energy-sector terms (e.g., “smart grid” and “fault detection”) and QML terms (e.g., “quantum neural network” and “quantum kernel”). We applied inclusion criteria to select studies focused on near-term viable QML applications (variational, hybrid, or annealing-based) tested on real-world energy datasets. We excluded studies which relied only on purely theoretical fault-tolerant quantum computers (e.g., using Grover’s or Shor’s algorithm) or classical quantum-inspired approaches. This process yielded 34 key studies, from which we identified and analyzed 22 distinct use cases across the energy value chain: distribution, generation, transmission, and financial operations (Figure 3). A set of descriptive characteristics was extracted for each, including the QML method, typology, and the hardware/software technologies used (Table 1). As shown in Figures 4 and 5, “generation” and “transmission” are the value chain segments with the highest number of studies, suggesting that these are areas of high interest and data availability. The “transmission” segment, in particular, features the most diverse set of use cases, reflecting its operational complexity and high business impact. Finally, the most significant merit figure from each study is collected and compared with the best classical counterpart in terms of method when present (Table 2). As evidenced by this comparison, the quantum method is often comparable to and sometimes even better than the classical in performance.

PRISMA flow diagram of the source selection process.
Figure 2. PRISMA flow diagram of the source selection process.
Distribution of papers and use cases per value chain.
Figure 3. Distribution of papers and use cases per value chain.

TABLE 1. Use case Method’s overview.

ReferenceIDMethodTypologySW technologyHW technologyReported classical benchmark
Nutakki et al. (2024)1QSVMImplicitNot specifiedNot specifiedRNN, LSTM
Safari and Badamchizadeh (2024)1QNNData re-uploadingPennyLane, IBM Quantum LabIBM (various devices)ARIMA, SARIMA, RNN, LSTM, GRU, and Ensemble Learning
Ajagekar and You (2024)2Hybrid RLHybridIBM QiskitIBM BrisbaneMPC, DDPG, Lo-DDPG
Andrés et al. (2022)3Hybrid RLHybridNot specifiedSimulatorNN
Arvanitidis et al. (2023)4VQCExplicitIBM QiskitSimulatorCNN
Xue et al. (2021)5VQCExplicitIBM QiskitSimulatorNone
Senekane and Taele (2016)6QSVMExplicitNot specifiedSimulatorNone
Yu et al. (2023)6QLSTMHybridPennyLaneSimulatorSARIMA, CNN, RNN, GRU, LSTM
Oliveira Santos et al. (2024)6QNNData re-uploadingIBM QiskitSimulatorSVR, XGBoost, GMDH
Hong et al. (2024)6Hybrid CNNHybridPennyLane, Torchquantum, CUDA QuantumSimulatorCNN
Sushmit and Mahbubul (2023)6Hybrid QNNHybridPennyLaneSimulatorRNN, LSTM
Hong et al. (2023)7QLSTMHybridPennyLaneSimulatorRF, SVR, XGBoost, NAR, LSTM, LSTM AE
Hsu et al. (2025)8QK-LSTMImplicitNot specifiedSimulatorLSTM
Jaderberg et al. (2024)8Physics Informed QNNData re-uploadingNot specifiedNot specifiedSpectral element method
Sagingalieva et al. (2023)9QNN, QLSTM, QSeq2SeqHybridPennyLaneSimulatorRNN, LSTM
Khan et al. (2024)9QLSTMHybridPennyLaneSimulatorLSTM
Zhu et al. (2024)9VAE-GWO-VQC-GRUHybridNot specifiedSimulatorGRU
Hangun et al. (2024a)10Hybrid QNN-SVRHybridPennyLaneSimulatorNone
Uehara et al. (2022)11Hybrid QNNHybridPennyLaneSimulatorNN
Ajagekar and You (2021)12Quantum sampling for CRBMAnnealingOcean (D-Wave SDK)DWave 2000 QPUNN, DT
Uehara et al. (2021)13QNNHybridIBM QiskitSimulatorNN
Correa-Jullian et al. (2022)14QSVMImplicitNot specifiedSimulatorRF, k-NN, L-SVM, and RBF-SVM
Gbashie e al. (2024)15Hybrid CNNExplicitIBM QiskitSimulatorNone
Zhou and Zhang (2023)16QNNData re-uploadingIBM QiskitSimulator, ibmq_boeblingen QPUNone
Sabadra et al. (2024)16QEK with VQCImplicitIBM QiskitSimulatorClassical kernel methods
Yu and Zhou (2024)16QaTSA with ReHELD VQCExplicitNot specifiedSimulatorNone
Yu et al. (2024)16QFL with HELD QNNsData re-uploadingIBM Qiskit, PennyLaneSimulator, IBM ibm_lagos (7-qubit QPU)NN
Chen and Li (2024)16QPCA + VQAHybridNot specifiedSimulatorPCA
Jafari et al. (2024)17QVRExplicitIBM QiskitIBM Falcon r5.11H QPULSTM
Wang et al. (2024)17QSVMImplicitIBM QiskitSimulatorSVM, other classical PQD methods
Hangun et al. (2024b)18VQCExplicitNot specifiedSimulatorSVM
Cao et al. (2023)19QLSTMHybridPennyLaneSimulatorNone
Zhou et al. (2024)20QCGAN + QAEData re-uploadingIBM QiskitSimulator, IBM QPUHistorical simulation, CGAN, QCGAN
Kumar et al. (2023)21Hybrid RLHybridRigetti Forest (PyQuil)SimulatorDeep Q-Learning
Andrés et al. (2022)22Hybrid RLHybridNot specifiedSimulatorNN-based RL
Aggregate scores of AMIM features for quantum machine learning applied to the energy industry. Scalability is the most rated characteristic, highlighting the strategic potential of this technology to this sector. On the other hand, feasibility concerns may arise, especially in the near-mid-term horizon, as expressed by the lowest score of the implementation feasibility feature.
Figure 4. Aggregate scores of AMIM features for quantum machine learning applied to the energy industry. Scalability is the most rated characteristic, highlighting the strategic potential of this technology to this sector. On the other hand, feasibility concerns may arise, especially in the near-mid-term horizon, as expressed by the lowest score of the implementation feasibility feature.
Distribution of papers by QML model typology (top), software framework used (middle), and hardware type (bottom; QPU vs. simulator). Hybrid model typologies are the most prevalent in the literature reviewed.
Figure 5. Distribution of papers by QML model typology (top), software framework used (middle), and hardware type (bottom; QPU vs. simulator). Hybrid model typologies are the most prevalent in the literature reviewed.

TABLE 2. Use case overview of results. The most representative metric of each study has been extracted and compared. When no metric is reported, the study has no classical benchmark. When no unit of measure is present for metrics like MSE or RMSE, values have been scaled.

ReferenceIDMethodMetricBest reported benchmarkBest QML result
Nutakki et al. (2024)1QSVMAccuracy95.01%97.36%
Safari and Badamchizadeh (2024)1QNNRMSE0.02 (Souabi et al., 2023)0.45
Ajagekar and You (2024)2Hybrid RLMonthly net electric consumption175.397 kWh175.120 kWh
Andrés et al. (2022)3Hybrid RLAvg. total reward−6.17−2.91
Arvanitidis et al. (2023)4VQCAccuracy75.5%81.0%
Xue et al. (2021)5VQCNone--
Senekane and Taele (2016)6QSVMNone--
Yu et al. (2023)6QLSTMRMSE63.856 W/m 261.756 W/m 2
Oliveira Santos et al. (2024)6QNNRMSE28.74 W/m 248.98 W/m 2
Hong et al. (2024)6Hybrid CNNRMSE% across seasons20%–60%3%–8%
Sushmit and Mahbubul (2023)6Hybrid QNNMAPE3.875%4.254%
Hong et al. (2023)7QLSTMR 20.94990.9653
Hsu et al. (2024)8QK-LSTMMAPE13.32%9.14%
Jaderberg et al. (2024)8Physics-informed QNNMean relative error (vorticity)Exact solution7.1%–10.9%
Sagingalieva et al. (2023)9QNN, QLSTM, QSeq2SeqRMSE0.09370.0743
Khan et al. (2024)9QLSTMRMSE0.01160.0058
Zhu et al. (2024)9VAE-GWO-VQC-GRURMSE (cloudy days)0.3030.128
Hangun et al. (2024a)10Hybrid QNN-SVRNone--
Uehara et al. (2022)11Hybrid QNNAccuracy95.39%93.89%
Ajagekar and You (2021)12Quantum sampling for CRBMMissed detection rate (worst case)10.2% (Silva et al., 2006)0.9%
Uehara et al. (2021)13QNNAccuracy95.39%93.89%
Correa-Jullian et al. (2022)14QSVMAccuracy94.5%92.5%
Gbashie et al. (2024)15Hybrid CNNNone--
Zhou and Zhang (2023)16QNNNone--
Sabadra et al. (2024)16QEK with VQCNone--
Yu and Zhou (2024)16QaTSA with ReHELD VQCNone--
Yu et al. (2024)16QFL with HELD QNNsAccuracy94.8%97.2%
Chen and Li (2024)16QPCA + VQAAccuracy95.6%97%
Jafari et al. (2024)17QVRRMSE0.0320.02
Wang et al. (2024)17QSVMAccuracy99,67% Uyar et al. (2009)96.25%
Hangun et al. (2024b)18VQCAccuracy96%65%
Cao et al. (2023)19QLSTMNone--
Zhou et al. (2024)20QCGAN + QAEDLC backtest on CVaR0.74350.3417
Kumar et al. (2023)21Hybrid RLUtility0.740.92
Andrés et al. (2022)22Hybrid RLAvg. total reward−4.28−2.58

5.3 Distribution

5.3.1 Overview

Predicting energy demand is a critical challenge for power systems. Forecasting methods vary in spatial and temporal resolution, from single appliances to national grids and from sub-hourly to yearly predictions (Debnath and Mourshed, 2018). Classical methods include statistical time-series models (e.g., ARIMA) and regression, while modern approaches heavily rely on machine learning models like NNs and SVMs to capture complex, nonlinear relationships in consumption data (Wei et al., 2019).

5.3.2 Key studies

QML offers new avenues for improving forecasting accuracy. Nutakki et al. (2024) applied a quantum support vector machine (QSVM) to forecast household energy consumption. This addresses the challenge classical SVMs face with highly complex, nonlinear consumption patterns by leveraging quantum feature spaces to potentially find more effective separating hyperplanes. Their results showed that the QSVM achieved higher accuracy (97.36%) than classical deep learning models like RNN and LSTM.

Safari and Badamchizadeh (2024) introduced “NeuroQuMan,” a QNN-based system to predict energy demand based on user reaction times, which demonstrated superior accuracy over classical benchmarks in simulations. Similarly, hybrid quantum-classical frameworks for demand response in buildings have shown promise. Ajagekar and You (2024) used a VQC within a reinforcement learning (RL) framework to optimize energy use, reporting a 13.6% reduction in energy consumption compared to classical control methods. Another QRL approach by Andrés et al. (2022) demonstrated that a hybrid quantum agent could learn an optimal energy-saving policy for an HVAC system more effectively than a classical neural network agent.

For smart grid management, Arvanitidis et al. (2023) used a variational quantum classifier (VQC) for appliance identification from power consumption data, achieving a 5% accuracy improvement over a classical CNN. The VQC’s ability to map data into a high-dimensional Hilbert space allows it to distinguish subtle signatures that are challenging for classical feature extraction methods.

5.4 Generation

5.4.1 Overview

Energy generation forecasting (EGF) plays a crucial role in managing the variability of renewable sources such as solar and wind, whose intermittent and volatile nature requires accurate forecasting to maintain grid stability and optimize resource use. Direct approaches often rely on time-series analysis or meteorological data from numerical weather prediction (NWP) models, while indirect approaches first predict site-specific weather profiles and then convert these into power output via weather-to-power performance models. Modern forecasting increasingly employs ML techniques—particularly NNs, SVMs, and LSTMs—whose performance can be enhanced by hyperparameter optimization methods such as ACO, genetic algorithms, and PSO (Jallal et al., 2020). Deep architectures, hybrid ML–physical approaches, and physics-informed methods have further improved accuracy and robustness in renewable generation forecasting (Sharadga et al., 2020; Mayer, 2022).

5.4.2 Key studies

Early QML applications to EGF include Senekane and Taele (2016), who used a QSVM to forecast solar irradiance from Cambridge University weather station data, and Li et al. (2015), who demonstrated a full quantum pipeline involving state preparation, matrix inversion, and variational classification. Building on this, Oliveira Santos et al. (2024) compared QNNs using angle encoding and a two-local ansatz against classical models on the Folsom, California dataset, finding that while XGBoost excelled in short-term horizons, QNNs were more effective for longer-term predictions. Extending to recurrent architectures, Yu et al. (2023) embedded VQCs into LSTM gates to create a QLSTM that outperformed SARIMA, CNN, RNN, GRU, and classical LSTM across five Chinese solar observatories.

Hybrid convolutional designs have also been explored, with Hong et al. (2024) developing an HQCNN optimized via Bayesian methods on Taiwanese irradiance data, demonstrating improved loss metrics, robustness to sensor faults, and superior speed using CUDA Quantum. Similarly, Sushmit and Mahbubul (2023) integrated PQC-based quantum layers into deep FFNs trained on NASA POWER data, showing that a two-quantum-layer hybrid achieved the best balance of accuracy and efficiency, while pure PQC models lagged behind. Sagingalieva et al. (2023) extended the hybrid concept to temporal models, proposing HQNN, HQLSTM, and HQSeq2Seq architectures for PV power forecasting, achieving 16%–41% accuracy gains over MLP and LSTM with fewer parameters and stronger performance on limited datasets. In another comparative study, Khan et al. (2024) found that QLSTM models trained on Indian and NREL datasets converged faster, exhibited more stable learning, and achieved higher accuracy than classical LSTM, although at the cost of longer evaluation times.

More complex hybrid pipelines have been proposed, such as the VAE-GWO-VQC-GRU framework of Zhu et al. (2024), which augmented and clustered Alice Springs PV data by weather condition before prediction, significantly outperforming GRU and VQC-GRU baselines. Beyond forecasting, Uehara et al. (2022) applied a hybrid QNN to optimize PV array topology under partial shading, achieving 85.12% classification accuracy for optimal configurations. In wind forecasting, Hong et al. (2023) combined LSTM with QNN and used the Taguchi method for systematic hyperparameter tuning, enhancing robustness across seasonal variations, while Hangun et al. (2024a) employed amplitude-encoded QNNs as feature extractors feeding into SVR for offshore wind farms, improving MAE and R 2 over classical baselines. Expanding to broader climate series, Hsu et al. (2025) embedded quantum kernels into LSTM transformations to create QK-LSTM, achieving higher accuracy with fewer parameters. Finally, Karniadakis et al. (2021) and Kashinath et al. (2021) reviewed physics-informed ML for climate and weather modeling, with Jaderberg et al. (2024) demonstrated that a quantum PINN could solve the barotropic vorticity equation, thus illustrating the potential for physically grounded quantum models in EGF.

5.5 Transmission

5.5.1 Overview

Transmission systems face new challenges from renewable integration, the rise of prosumers, and the reduced inertia of non-synchronous generation, making fault detection, diagnosis, and stability assessment increasingly critical. Traditional FDD approaches, rule-based, model-based, and more recently, ML- and DL-based, struggle with the growing data volume and complexity, opening opportunities for QML to improve detection accuracy, computational speed, robustness, and predictive maintenance (Correa-Jullian et al., 2022).

5.5.2 Key studies

For fault diagnosis, Ajagekar and You (2021) proposed a hybrid QC-trained CRBM on the IEEE 30-bus system, combining quantum generative training with discriminative fine-tuning to match or exceed ANN and DT performance while halving classification latency. In PV fault detection, Uehara et al. (2021) compared QNNs with different feature maps and ansatz choices on NREL datasets, showing competitive accuracy and reduced training epochs. Extending to wind turbine pitch systems, Correa-Jullian et al. (2022) benchmarked Q-SVMs against classical SVM, RF, and k-NN, finding that angular encoding Q-SVMs outperform RF and k-NN in certain feature settings when combined with PCA or AE-based reduction.

In transient stability assessment, Zhou and Zhang (2023) introduced qTSA with VQCs to separate stable and unstable states in SMIB, two-area, and NPCC systems, maintaining >95% accuracy on IBM hardware despite noise. Similarly, Sabadra et al. (2024) employed quantum-embedded kernels optimized by aligning the target kernel, achieving up to 98. 4% precision in SMIB. Hangun et al. (2024b) found that classical SVM outperformed VQC on a small smart grid, highlighting the need for careful feature map and ansatz tuning. Chen and Li (2024) demonstrated that combining QPCA, quantum inner products, and VQA could yield 98.7% accuracy in microgrid TSA with fewer measurements.

Distributed approaches have been explored by Yu et al. (2024), whose Q-dTSA used HELD-based federated QNNs to preserve local data privacy while matching DNN accuracy with 75% fewer parameters and faster convergence. The robustness to adversarial manipulation was addressed by Yu and Zhou (2024), who developed ReHELD circuits that improved classification under data poisoning and deletion by up to 18%. Optimization-based methods also feature, with Fei et al. (2024) formulating combinatorial fault diagnosis as a QAOA problem, introducing symmetric equivalent decomposition for efficient multi-z-rotation gates. For time anomaly detection in PMU streams, Jafari et al. (2024) proposed the QVR algorithm, optimized for shallow NISQ circuits and integrated with high-speed classical computing.

In power quality analysis, Wang et al. (2024) applied QSVMs with quantum feature mapping and kernel computation, achieving perfect disturbance detection in some datasets and maintaining over 87% accuracy under noise. Finally, Gbashie et al. (2024) integrated VQCs into CNN architectures for wind turbine gearbox fault detection, surpassing 99.2% accuracy with faster convergence when using the Adam optimizer.

5.6 Financial Operations

5.6.1 Overview

Carbon markets are a key instrument for mitigating climate change; this makes accurate carbon price forecasting and risk estimation essential for investors and policymakers. Other financial-related operations, such as energy trading and scheduling, could also benefit from advanced ML.

5.6.2 Key studies

Cao et al. (2023) developed an improved quantum long-term memory model (L-QLSTM) to predict carbon prices. By replacing classical gates in an LSTM with VQCs, the model leverages quantum expressivity to capture complex temporal dependencies that may be difficult for classical LSTMs to model efficiently. The L-QLSTM showed performance comparable to that of a classical LSTM but with improved learning stability.

For estimating carbon market risk, Zhou et al. (2024) proposed a framework using a quantum conditional generative adversarial network (QCGAN) to model return distributions and quantum amplitude estimation (QAE) to measure risk. This quantum approach offers a potential quadratic speedup over classical Monte Carlo methods for risk estimation, which are notoriously computationally intensive. The framework demonstrated a significant reduction in computational time and improved accuracy over classical models.

In energy trading, Kumar et al. (2023) designed a system combining blockchain with quantum reinforcement learning (QRL) to optimize P2P energy trading for EVs. The QRL agent learned an optimal pricing policy faster and more effectively than its classical counterparts.

6 Analysis and discussion

6.1 Assessment Model for Innovation Management

To evaluate the use cases identified, we introduce the Assessment Model for Innovation Management (AMIM). In an era of technological uncertainty, a structured framework is essential to allocate resources effectively. AMIM assesses use cases along two dimensions: readiness to market (scalability, market compatibility, and implementation feasibility) and potential benefit (impact on efficiency, problem criticality, and room for improvement). It is designed to be impartial with respect to the sector and technology, drawing inspiration from frameworks such as TRL (Héder, 2017) and SMART (Kumari et al., 2022) but focusing on the use case as a whole rather than just the technology.

6.1.1 Readiness to market

This dimension reflects how prepared a use case is for real-world deployment, looking at its ability to scale, fit market conditions, and be implemented with minimal friction. Scalability concerns whether the use case can handle growing demand, larger user bases, and evolving needs, paying attention to its capacity for user growth and flexibility to integrate with new technologies or adapt to changing business contexts. Market compatibility examines how well the current environment, society, stakeholders, technology, business structures, and ecosystems can support adoption, considering both customer readiness and the availability of the necessary technological infrastructure. Implementation feasibility captures the ease of integrating the use case into existing systems and processes, focusing on the complexity of the required integrations and the ability to meet regulatory requirements without excessive effort.

6.1.2 Potential benefit

This dimension measures the value a use case provides to the industry in terms of efficiency and long-term advantage. Impact on efficiency addresses the potential for cost reduction, return on investment, and productivity gains, showing whether the benefits justify the investment and improve operations. Criticality of the problem assesses the urgency and importance of the issue to be addressed, taking into account its severity, the level of market demand for a solution, and the sustainability of the impact—environmental, social and economic. Margin for further improvement looks at how much room remains for both vertical and horizontal development, taking into account the current stage of maturity and any performance gaps that signal opportunities for improvement.

6.1.3 Results

Each use case was scored from 1 (weak) to 4 (high) according to the AMIM criteria (Table 3). The aggregated scores position each use case in one of four quadrants (Figure 6): transformative leaders, research-heavy innovators, emerging niches, and experimental niches. Our analysis identifies power stability assessment (ID 16), fault diagnosis (ID 12), and wind speed forecasting (ID 7) as transformative leaders. These use cases are critical for the energy transmission and generation sectors, especially with growing grid complexity, and show both high market readiness and significant potential benefit from QML solutions. The transmission value chain stands out for hosting the most valuable use cases. In contrast, financial applications currently fall more into the experimental category. A key finding is that, while the technological feasibility of QML is still low, the overall market readiness is often decent due to the strong demand of the energy industry for innovative and scalable solutions (Figure 4).

TABLE 3. Assessment model for innovation management.

IDScalabilityMarket compatibilityImplementation feasibilityTotal readiness to marketImpact on efficiencyCriticality of the problemMargin for further improvementTotal potential benefit
142173339
231264318
343291113
442171135
531153216
6442101326
734293328
843182237
923272226
10433101124
1122263126
124431134310
1344193126
1424281124
15421744412
16441934411
1732163339
1823381135
1922261124
2011241113
2112142125
2233172237
Graphical representation of AMIM quadrants. The two axes represent the potential benefit that each use case could give industrial workloads and its respective readiness to market—the state of maturity of that application. The mid-values separate the four quadrants, which classify the innovative figure of each use case (for use case ID mapping, see Table 4).
Figure 6. Graphical representation of AMIM quadrants. The two axes represent the potential benefit that each use case could give industrial workloads and its respective readiness to market—the state of maturity of that application. The mid-values separate the four quadrants, which classify the innovative figure of each use case (for use case ID mapping, see Table 4).

TABLE 4. Look-up table for use cases.

Value chainCategoryUse caseReferenceID
DistributionDemand response systemsLoad forecasting for demand responseNutakki et al. (2024), Safari and Badamchizadeh (2024)1
Automated demand response in smart citiesAjagekar and You (2024)2
Smart grid managementHVAC automated control in buildingsAndrés et al. (2022)3
Appliance signature identificationArvanitidis et al. (2023)4
Electricity theft detectionXue et al. (2021)5
GenerationIndirect generation forecastingSolar irradiation forecastingSenekane and Taele (2016), Yu et al. (2023), Oliveira Santos et al. (2024), Hong et al. (2024), Sushmit and Mahbubul (2023)6
Wind speed forecastingHong et al. (2023)7
Weather and climate modelingHsu et al. (2025), Jaderberg et al. (2024)8
Direct generation forecastingPhotovoltaic power forecastingSagingalieva et al. (2023), Khan et al. (2024), Zhu et al. (2024)9
Forecasting power from offshore wind farmsHangun et al. (2024a)10
Plant operationsPV array topology optimizationUehara et al. (2022)11
TransmissionMaintenanceFault diagnosis in electrical power systemsAjagekar and You (2021)12
Photovoltaic panel fault detectionUehara et al. (2021)13
Wind turbine pitch fault detectionCorrea-Jullian et al. (2022)14
Defect detection in wind turbine gearboxGbashie et al. (2024)15
Grid operationsPower system stability assessmentZhou and Zhang (2023), Sabadra et al. (2024), Yu and Zhou (2024), Yu et al. (2024), Chen and Li (2024)16
Power disturbances and events identificationJafari et al. (2024), Wang et al. (2024)17
Smart grid stability forecastingHangun et al. (2024b)18
Financial operationsFinance for sustainable energyCarbon price forecastingCao et al. (2023)19
Carbon market risk estimationZhou et al. (2024)20
Blockchain-based p2p energy trading for e-mobilityKumar et al. (2023)21
Smart energy distributionOptimal scheduling of EV rechargesAndrés et al. (2022)22

6.1.4 Limitations and future validation of AMIM

It is important to acknowledge that AMIM is a novel framework proposed in this study. As such, it has not yet undergone external validation. Its current application relies on our assessment based on the literature reviewed. To strengthen its credibility and promote broader adoption, future research should focus on validating the framework. Potential validation methods include the following.

  • • Expert review: engaging a panel of industry and academic experts from both the energy and quantum computing sectors to review and refine the AMIM dimensions and KPIs.
  • • Pilot testing: applying the framework in a real-world corporate innovation setting to assess its utility as a practical decision-support tool for prioritizing R&D investments.
  • • Comparative analysis: benchmarking the outcomes of an AMIM assessment against those produced by other established technology or innovation readiness frameworks.

This validation process would enhance the robustness of AMIM and solidify its value as a tool for strategic innovation management.

7 Conclusion

This scoping review maps the early applications of quantum machine learning (QML) in the energy industry. We provide a condensed overview of the relevant concepts of QC and ML and focus on near-term viable QML techniques, such as VQAs, hybrid architectures, and quantum annealing. Key studies show promising results, particularly for hybrid models that integrate quantum and classical computing, suggesting that they are a practical first step for applying QML to real-world workloads.

Although a scoping review does not permit a quantitative synthesis of results, our novel assessment framework, AMIM, provides a structured way to evaluate the 22 identified use cases based on their technological maturity and potential benefits. A key strength of AMIM is its versatility, which makes it applicable to other exploratory research fields. The analysis revealed that while quantum hardware limitations remain the main bottleneck, as evidenced by the prevalent use of simulators, the market readiness for these innovations is surprisingly high. This study highlights a clear path for future QML applications in the critically important energy sector and provides a framework for navigating innovation in this pioneering field.

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Statements

Conflict of interest

Authors FS, LM, NG, GC, SP, and EL were employed by PwC.

Funding

The author(s) declare that financial support was received for the research and/or publication of this article. This research was funded by Spoke 10 - ICSC - “National Research Centre in High Performance Computing, Big Data and Quantum Computing” grant number N. 2 - prot. 117080, 15/05/2024. This work is also framed within the strategic context of the European Union’s NextGenerationEU program, which supports research in key enabling technologies for a sustainable and resilient future.

Author contributions

FS: Formal Analysis, Supervision, Project administration, Validation, Methodology, Writing – review and editing, Funding acquisition, Software, Writing – original draft, Investigation, Resources, Conceptualization, Data curation, Visualization. LM: Investigation, Writing – review and editing, Writing – original draft, Validation, Data curation, Visualization, Formal Analysis. NG: Writing – original draft, Writing – review and editing, Visualization, Investigation. NG: Data curation, Formal Analysis, Writing – review & editing, Investigation, Writing – original draft. GC: Writing – original draft, Methodology, Conceptualization, Writing – review and editing, Data curation. SP: Writing – original draft, Writing – review and editing, Project administration. EL: Writing – review and editing, Supervision, Project administration, Writing – original draft, Conceptualization.

Acknowledgements

First and foremost, we are thankful to PwC Italy, particularly to our Data & AI leader Massimo Iengo for being the first to believe in our innovative journey into quantum computing, not to forget all the people from the Data & AI team who have helped in making all of this work possible. We also wish to acknowledge the valuable financial support from Spoke 10 - ICSC - “National Research Centre in High Performance Computing, Big Data and Quantum Computing”, funded by the European Union–NextGenerationEU. Notably, we express our sincere gratitude to Professor Paolo Cremonesi and Beatrice Goretti from Politecnico di Milano for their essential support and encouragement since the very beginning of this entire quantum computing exploration initiative.

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Citation

Strata, F., et al. (2025). Quantum machine learning early opportunities for the energy industry: a scoping review. Frontiers in Quantum Science and Technology, Volume 4. https://doi.org/
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4 - 2025

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Copyright © 2025 Strata, Migliori, Gebran, Guarino, Colombo, Pezzuolo and Luzietti.

License: http://creativecommons.org/licenses/by/4.0/

*Correspondence: Francesco Strata

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