โจทย์ ปรนัย
What is identified as one of the most significant technical barriers to large-scale renewable energy storage?

1.ปัจจุบันระบบกักเก็บพลังงาน (Storage Technologies) ยังไม่ตอบโจทย์ 2.ต้นทุนของพลังงานกักเก็บ (Cost per kWh) เป็นอุปสรรคหลัก

In general, there have been numerous studies on the technical feasibility of renewable energy sources, yet the system-level integration of large-scale renewable energy storage still poses a complicated issue, there are several issues concerning renewable energy storage, which warrant further research specifically in the following topics (Darlington Eze Ekechukwu and Peter Simpa, 2024, Popescu et al., 2024). There is a vast literature on the characteristics and efficiency of different types of storage including batteries, pumped hydro storage, and thermal storage. On the other hand, integration difficulties, the economic model, policies, and regulations, and the requirements for the use of technology as well are some of the questions that deserve further study (Bulut and Özcan, 2024). This research intends to fill these gaps by performing a systems-level investigation of the integration of storage into existing electric power systems, overly analyzing every strategic scenario for cost reduction and associated economic scenarios, and reviewing regulation policies that may encourage high storage system penetration. In addition, the study will also ascertain new radical innovations that are available in the storage technology to improve performance and durability. Addressing these research gaps is crucial for several reasons: concerning the international shift in energy consumption and the associated risk, cost, and environmental concerns: contributing to the creation of favorable policies as well as the improvement of technological innovation. Configuration problems also revolve around certifying that storage technologies can support the integration of renewable energy and surviving present electrical grid facilities to assure adequate stability and reliability of the grid. Economic concerns will be concerned with the optimal means of storing the products and how the costs can be minimized by exploiting what economists refer to as the principle of increasing returns to scale majorly by using advanced technology. They are usually restricted from large-scale storage projects by policy of governance and regulations This study will establish how these barriers could be addressed. Therefore, the closing of these gaps is the purpose of this study to enhance the large-scale RES solutions development and deployment for a better energy future that is sustainable, reliable, and economically efficient. The findings of this research will be useful to further the area of renewable energy storage and make sure that provides a sufficient supply of clean energy to the world.

โจทย์ ปรนัย
Which regulatory challenge most directly impedes investment in large-scale storage infrastructure?

1.Unclear classification and participation rules 2.Regulatory uncertainty and policy instability 3.Complex grid connection and fee regimes

Beyond hybridization, several challenges hinder ESS prevalence. Economic constraints and challenges related to additional costs, industry acceptance, technology performance, safety concerns, and market and regulatory barriers contribute to the slow progress of ESS deployment. These challenges collectively impact the market competitiveness, investment potential, and regulatory framework necessary for ESS proliferation.

โจทย์ ปรนัย
What solution is proposed to address the fragmented policy landscape?

1.Policy harmonization across sectors and regions 2.Consult a clear market signals and long-term goals 3.Standardized definitions and roles for storage 4.Reform of market design 5.Dedicated storage targets and procurement mechanisms 6.Cross-sector planning frameworks

The incorporation of large-scale renewable energy systems poses a great problem for large-scale economics. Another problem is that the establishment costs may be substantially higher compared to initiating normal deploys of complicated software systems. Systems like battery storage, pumps and storage, and compressed air storage are expensive capital-intensive systems, and this scares investors. Moreover, recording and preserving these storage systems often entail high operating and maintenance costs that also aggravate the economic issue. Another problematic element of this economic discussion and macro-micro policy loop is the variation in the price of renewable energy sources themselves. Solar and wind energy have become much cheaper to generate but have a major disadvantage of being intermittent and hence require reliable means and methods of storage. This intermittency means that the storage systems have to not only be effective in their ability to store the energy but also cost-effective in the long run; a big issue. In addition, global regulation and policy maps may also affect the economic viability of renewable energy storage on a large scale. Applied policies, no motivation, and regulatory barriers can slow down the creation and expansion of these technologies. Cost again comes into the picture with the aspect of pricing of stored energy which may fluctuate depending on the market demands of that particular period which may be over certain seasons. Overcoming such economic factors and issues is central to practice-oriented multifunctional large-scale combined renewable energy storage systems integration. The mentioned barriers can be addressed with proper strategic investments, positive government policies, and the development of new technologies (Olabi et al., 2021). Of course, this cost does not only include the storage component, which is mainly focused on today, but it also contains the entire power plant system in interaction with the energy storage device, in which the storage component is about 30–40 percent of the total cost of the system (Chu and Majumdar, 2012). Even though the high cost of EES implementation could be a certain barrier, the trend of penetration of various kinds of EES technologies in other industries, as an example, the increasing demand for batteries in EVs or the importance of large-scale storage like hydrogen, leads to a reduction in costs of these EES’s related technologies. Thus, in the near future, the technology that can be employed for accelerating global issues solving pace and keep up with the demand’s trend, may see a substantial decrease in its costs and be considered as a commercialized one (Topalović et al., 2023, Xiao et al., 2023).

โจทย์ ปรนัย
Which material is noted for its potential in increasing storage capacity?

Graphene is recognized as a material with strong potential to increase storage capacity, especially when used in supercapacitors or as a battery electrode material

(BESS) or battery energy storage systems simplify storing energy from renewables and releasing the electric energy in the demand time, meanwhile, the characteristic of being rechargeable makes them applicable for most of the scenarios (Zhang et al., 2018). Among the plethora types of this kind of cells, NaS, ZnBr, Regenerative zinc air, Li-ion, Lithium metal polymer batteries, and NiMH are known to have high power density, relatively highly efficient, long-life cycle, and less toxicity. However, the safety concerns, grand initial costs, and being novel and untested are considered to be the barriers to installing batteries (Chen et al., 2009). Pumped hydro storage systems (PHS), CAES, and flywheel energy storage (FES) are subcategories of mechanical energy storage systems. Due to the high power and energy besides of least capital costs that mechanical energy systems contain, they are suitable for large-scale power production, whilst, huge construction time, specific geological requirements, and standby losses can be nominated our obstacles in opting for this system over others (Jafarizadeh et al., 2020). Overall compared with batteries, because of better life cycle designers tend to use CAES, LAES, and relative storage systems in their templates before commencing to construct the powerplant (Esmaeilion and Soltani, 2024). A thermal energy storage system (TES) exists in two shapes; latent TES and chemical TES. Latent TES operates in medium temperatures of 20–40 °C (paraffin) and 30–80 °C (salt hydrates) and has moderate storage density, while chemical TES works in the range of 20–200 °C and has upper storage density, which is the best option for large scale power plants. Moreover, it is an excessively compact energy storage system by far (Kuravi et al., 2013). Hydrogen can be another way of storing energy due to its high energy density and its capability of generating an enormous amount of energy. Hydrogen is rare on earth and because it's lighter than air it escapes simply, so how to produce, store, and transfer Hydrogen is a developing technology and is called the Hydrogen Economy (Zarnoush et al., 2023). There are a few ways to obtain it like reforming processes or electrolysis with components including steel or geologic hydrogen storage tanks), an electrolyzer, and a combustion engine or fuel cell to alter the hydrogen into electricity (Louie et al., 2007).

โจทย์ ปรนัย
Why are economic incentives considered essential for advancing energy storage deployment?

1.High Capital Costs and Uncertain Returns -Energy storage technologies often require significant initial investments. 2.Market Uncertainty and Risk Reduction 3.Correcting Market Failures 4.Stimulating Innovation and Scale-up 5.Supporting Policy Goals

Economic incentives are a critical enabler to overcome the high capital costs and financial risks associated with energy storage investments, especially in early market stages where revenues remain uncertain and market rules are evolving.

โจทย์ ปรนัย
What is a key environmental concern associated with current storage technologies?

1.Extraction of critical minerals for batteries can cause significant ecological degradation, including habitat destruction, water pollution, and high energy consumption. 2.Limited recycling infrastructure leads to waste management issues and the risk of hazardous materials entering the environment at the end of battery life. 3.Some storage technologies also involve toxic chemicals or heavy metals that pose risks during manufacturing, use, and disposal.

One of the most pressing challenges in the energy sector is the intermittent nature of REs like wind and solar. EES systems provide a bridge between energy generation and consumption. EES technologies can significantly accelerate the use of REs in several ways. First is intermittency mitigation. EES systems can store excess energy produced during peak renewable energy generation periods and release it when energy demand is high but production is low. This mitigates the intermittency issues associated with renewables, ensuring a continuous and reliable energy supply. The second one is grid stabilization. Renewable sources like wind and solar can introduce variability and instability into the grid. EES can act as a stabilizing force, smoothing out fluctuations and maintaining grid reliability. This grid support is essential for integrating more renewables, (Basit et al., 2020). The next way is increased energy utilization. EES allows for the capture of surplus energy that might otherwise go to waste during periods of low demand. This stored energy can be utilized during peak demand, making renewable sources more economically viable and efficient, (He et al., 2021). Another strategy is energy time shifting. EES enables energy time-shifting, where excess energy generated during off-peak hours can be stored for use during peak-demand periods. This maximizes the utilization of renewable resources and reduces the need for backup fossil fuel-based power generation. Also, enhanced grid resilience is reliable. EES provides backup power during grid failures and can help in grid restoration after outages. This resilience is crucial for regions heavily reliant on renewables, ensuring continuous power availability, (Xu et al., 2023). Besides, reduced carbon Emissions. By facilitating the integration of REs, EES reduces the dependence on fossil fuels. This leads to a significant reduction in carbon emissions, contributing to environmental sustainability and combating climate change, (Saidi and Omri, 2020). Also, energy independence is useful. EES technologies can enable communities, businesses, and even entire regions to become more energy self-sufficient by harnessing and storing energy from local renewable sources, (Marocco et al., 2023).

โจทย์ ปรนัย
How can large-scale storage help address grid intermittency issues?

1.Balancing supply and demand: Storage systems absorb surplus electricity generated during peak renewable production and discharge it when generation drops or demand spikes, maintaining grid stability. 2.Frequency and voltage regulation: Storage can quickly respond to grid disturbances, helping to regulate frequency and voltage, which are critical for reliable grid operation. 3.Peak shaving and load shifting: By storing energy during low-demand periods and supplying it during high-demand peaks, storage reduces strain on the grid and defers infrastructure upgrades. 4.Enabling higher renewable penetration: By mitigating intermittency, storage allows the grid to accommodate a larger share of renewables without compromising reliability.

3.2 section Combining thermal and mechanical components, thermomechanical EES offers minutes to hours of response time. This technology excels in waste heat recovery, industrial processes, and thermal management applications. For instance, it's widely used in capturing and reusing excess heat generated during industrial operations (Steinmann, 2017). 5.1 section addressing these limitations, hybridizing ESS technologies emerges as a strategic approach. This involves merging diverse ESS to harness their combined capabilities, overcoming the limitations of individual EES units. As REs exhibit variability due to production fluctuations and changing demands, the integration of multiple ESS through hybridization presents an effective solution to bridge this gap and manage energy variabilities (Khalilpour and Vassallo, 2016a).

โจทย์ ปรนัย
Which stakeholders are described as crucial in overcoming regulatory inertia?

They are crucial stakeholders because they help harmonize policies, update regulations, and coordinate efforts across jurisdictions to overcome regulatory inertia and enable large-scale energy storage deployment.

The incorporation of large-scale renewable energy systems poses a great problem for large-scale economics. Another problem is that the establishment costs may be substantially higher compared to initiating normal deploys of complicated software systems. Systems like battery storage, pumps and storage, and compressed air storage are expensive capital-intensive systems, and this scares investors. Moreover, recording and preserving these storage systems often entail high operating and maintenance costs that also aggravate the economic issue. Another problematic element of this economic discussion and macro-micro policy loop is the variation in the price of renewable energy sources themselves. Solar and wind energy have become much cheaper to generate but have a major disadvantage of being intermittent and hence require reliable means and methods of storage. This intermittency means that the storage systems have to not only be effective in their ability to store the energy but also cost-effective in the long run; a big issue. In addition, global regulation and policy maps may also affect the economic viability of renewable energy storage on a large scale. Applied policies, no motivation, and regulatory barriers can slow down the creation and expansion of these technologies. Cost again comes into the picture with the aspect of pricing of stored energy which may fluctuate depending on the market demands of that particular period which may be over certain seasons. Overcoming such economic factors and issues is central to practice-oriented multifunctional large-scale combined renewable energy storage systems integration. The mentioned barriers can be addressed with proper strategic investments, positive government policies, and the development of new technologies (Olabi et al., 2021). Of course, this cost does not only include the storage component, which is mainly focused on today, but it also contains the entire power plant system in interaction with the energy storage device, in which the storage component is about 30–40 percent of the total cost of the system (Chu and Majumdar, 2012). Even though the high cost of EES implementation could be a certain barrier, the trend of penetration of various kinds of EES technologies in other industries, as an example, the increasing demand for batteries in EVs or the importance of large-scale storage like hydrogen, leads to a reduction in costs of these EES’s related technologies. Thus, in the near future, the technology that can be employed for accelerating global issues solving pace and keep up with the demand’s trend, may see a substantial decrease in its costs and be considered as a commercialized one (Topalović et al., 2023, Xiao et al., 2023).

โจทย์ ปรนัย
Which of the following is a suggested innovation strategy for improving system-level storage performance?

1.Decentralizing renewable storage grids is a recognized innovation strategy to improve system-level storage performance by enhancing flexibility, resilience, and reducing transmission losses. 2.The articles emphasize distributed storage deployment as a way to better manage intermittency and improve grid stability.

5.1. Hybridization as a solution In addressing these limitations, hybridizing ESS technologies emerges as a strategic approach. This involves merging diverse ESS to harness their combined capabilities, overcoming the limitations of individual EES units. As REs exhibit variability due to production fluctuations and changing demands, the integration of multiple ESS through hybridization presents an effective solution to bridge this gap and manage energy variabilities (Khalilpour and Vassallo, 2016a). Fig. 7 provides a visual representation of how different Energy Storage System (ESS) technologies can be strategically positioned and integrated within a Hybrid Energy Storage System (HESS) to effectively tackle the challenges arising from the fluctuations in energy production and demand. It presents a conceptual framework for a HESS, illustrating the seamless fusion of various ESS varieties. This integration not only enhances the regulation of power but also adeptly manages the inherent variability in renewable energy generation, while also catering to the diverse patterns of energy demand. By harnessing the combined strengths of different EES units, the HESS emerges as a resilient and versatile energy storage solution.

โจทย์ ปรนัย
Which hydrogen production method is still considered the most carbon-intensive?

โจทย์ ปรนัย
What is one major advantage of hybrid hydrogen production systems?

Hybrid hydrogen systems combine renewable-powered electrolysis with thermochemical or fossil-based methods, often with carbon capture technologies.

Integrating both renewable and non-renewable energy sources into water electrolysis systems enhances operational flexibility and energy reliability. By leveraging renewable sources like solar and wind during periods of surplus, and supplementing with non-renewable sources such as natural gas or grid electricity when renewable supply is low, electrolyzers can maintain consistent hydrogen production. This hybrid approach ensures continuous operation, improves system utilization, and supports the transition toward cleaner energy while balancing current infrastructure and energy demands. Reversible systems, such as solid oxide fuel cell/electrolyzer units, further enhance flexibility by enabling both hydrogen production and electricity generation depending on energy availability and demand.

โจทย์ ปรนัย
Which technology is often paired with hydrogen production to reduce emissions?

1.Carbon Capture and Storage (CCS) is used to capture the CO₂ emissions at the production site, preventing them from entering the atmosphere.

Carbon Capture and Storage (CCS) is paired with hydrogen production—especially grey or blue hydrogen made from fossil fuels like natural gas—to significantly reduce CO₂ emissions. During the hydrogen production process, particularly steam methane reforming (SMR), large amounts of carbon dioxide are released. CCS captures this CO₂ before it enters the atmosphere and stores it underground or uses it in other industrial processes.

โจทย์ ปรนัย
Why is the shift to blue hydrogen considered a transitional strategy?

it serves as a bridge between high-emission hydrogen (grey) and fully clean hydrogen (green).

Blue hydrogen is often seen as a transitional solution that leverages existing natural gas infrastructure and adds carbon capture to reduce emissions while green hydrogen production scales up.

โจทย์ ปรนัย
Which method uses electrolysis powered by renewable energy?

Green hydrogen is produced through electrolysis of water, using renewable energy sources such as solar or wind power to split water into hydrogen and oxygen.

Green hydrogen is generated through water electrolysis powered by renewable energy sources, resulting in zero-carbon emissions during the production process.

โจทย์ ปรนัย
What is a key infrastructure challenge to scaling hydrogen production?

Most existing infrastructur is designed for natural gas or other fuels, not hydrogen, which has different physical properties

The underdeveloped infrastructure for hydrogen transport, storage, and distribution remains one of the primary challenges for scaling up hydrogen production and utilization.

โจทย์ ปรนัย
What policy approach does the article suggest to encourage hydrogen development?

long-term financial support mechanisms 1.Capital subsidies 2.Tax credits 3.Public investment in R&D

Carbon pricing mechanisms and long-term funding policies are instrumental in enabling the competitiveness of low-emission hydrogen production routes

โจทย์ ปรนัย
Why is public perception considered a barrier to hydrogen adoption?

โจทย์ ปรนัย
What is an emerging innovation in hydrogen production discussed in the article?

โจทย์ ปรนัย
Based on the diagram provided, which of the following best describes the function of a “Multi Scale EES” system within a renewable energy infrastructure?

It acts as a centralized or coordinated hub that manages energy flow, ensuring reliable grid distribution.

In the process of transitioning towards cleaner and more sustainable energy sources due to the challenges of climate change, there is a pivotal role for integrating renewable energies. These renewable sources encompass biomass, solar, geothermal, wind, oceanic, tidal, and hydro power, providing abundant and eco-friendly energy solutions. Nevertheless, these renewable sources, due to their intermittent and variable nature, require strategies to ensure a stable, continuous energy supply for modern society, Fig. 2.

โจทย์ ปรนัย
According to the diagram, which stage is most directly responsible for separating hydrogen from other gases after the reforming and water-gas shift processes?

CO +H2O ---> H2 + CO2

The steam reforming of natural gas is recognized as a well-established technology, both from a technical and commercial perspective, particularly at an industrial scale. This reforming technology is predominantly utilized in the petrochemical and fertilizer industries for the intentional synthesis of hydrogen. Industrial steam reformer units are characterized by the presence of approximately 1,000 splitting tubes, each with a diameter of about 100 mm and a length of 10 m. These units are capable of achieving a production capacity of approximately 130,000 Nm3/h (see Fig. 3). It is noteworthy that the Fortum refinery located in Porvoo, Finland, houses an operational hydrogen plant that was inaugurated in 2007. This facility has a substantial capacity of 180,000 Nm3/h, which corresponds to approximately 16.2 tons per hour of hydrogen. This output translates to a stored energy capacity of 645 MW, based on the Higher Heating Value (HHV). Consequently, this plant is recognized as one of the largest single-line steam-reforming hydrogen production facilities in the world. Future reformer plants are currently being designed to achieve a production capacity of 237,000 Nm3/h. Commercial large-scale Small Modular Reactors (SMRs) demonstrate a hydrogen production efficiency of approximately 75%, accompanied by a carbon dioxide intensity of 9.5 kg kgH2−1[89]. In modern SMRs, the application of multiple catalysts at different thermal conditions is a prevalent approach to optimize the generation of hydrogen gas. Notwithstanding the presence of heat losses and the limitations imposed by thermodynamic principles, as dictated by the Carnot efficiency, these reformers attain an