Top Energy Storage Solutions for Renewable Energy

‭Top Energy Storage Solutions for‬ ‭Renewable Energy‬

‭Energy Storage Solutions (Brief‬ ‭Definition)‬ ‭Energy Storage Solutions‬‭encompass a diverse array‬‭of technologies‬ ‭designed to capture, store, and utilize energy efficiently. These‬ ‭solutions are pivotal in enabling the widespread adoption of‬ ‭renewable energy‬‭sources by addressing their intermittent‬‭nature.‬ ‭From lithium-ion batteries to redox flow batteries, these innovative‬ ‭technologies store excess energy generated from renewable sources‬

‭like solar and wind. Energy Storage Solutions play a critical role in‬ ‭stabilizing grids, reducing reliance on fossil fuels, and promoting a‬ ‭cleaner, sustainable energy future.‬

‭ nergy storage‬‭is rapidly advancing, with ongoing‬‭research focused on creating‬ E ‭efficient, long-lasting solutions that are essential across the manufacturing, service,‬ ‭renewable energy,‬‭and portable electronics sectors.‬‭The need for effective energy‬ ‭storage technologies becomes crucial as the world increasingly relies on‬‭renewable‬ ‭energy‬‭to reduce carbon emissions and fossil fuel‬‭dependency. Renewable energy‬ ‭generation is intermittent, depending on natural factors like river flows, daylight, and‬ ‭wind consistency, while energy demand fluctuates throughout the day and year.‬ ‭ toring excess‬‭renewable energy‬‭when generation surpasses‬‭demand ensures its‬ S ‭availability during shortages, thus preventing waste and maintaining a balanced‬ ‭supply. By storing and using renewable energy, we reduce reliance on greenhouse‬ ‭gas-emitting fossil fuels and make full use of clean power generation capabilities.‬ ‭The current focus in the energy storage industry is on improving energy consumption‬ ‭capacities to ensure stable and economical power system operations. Key trends‬ ‭include moving away from traditional lithium-ion batteries towards innovative‬ ‭chemistries with better stability, density, and lifespan developing energy storage‬ ‭solutions that can efficiently capture intermittent renewable energy and scale it up to‬ ‭power large areas; and transitioning from centralized to flexible, portable distributed‬ ‭energy storage.‬

‭Energy Storage Solutions‬ ‭Let’s have a look at some of the top Energy Storage Solutions available.‬

‭ADVANCED LITHIUM BATTERIES‬ ‭ ithium-ion batteries are renowned for their portability, quick recharging, low‬ L ‭maintenance, and versatility. Despite these advantages, they have significant‬ ‭drawbacks such as flammability, sensitivity to high temperatures, the need for‬ ‭overcharge or complete discharge protection, and aging issues. Moreover, the‬ ‭environmental impact of mining the components used in these batteries is‬ ‭substantial. Startups are addressing these challenges by enhancing the performance‬ ‭and longevity of lithium-ion batteries through innovative materials.‬ ‭ ew battery chemistries like lithium polymer, lithium air, lithium titanate, and lithium‬ N ‭sulfur are being developed to replace traditional lithium-cobalt electrodes. Some‬ ‭companies are focusing on recycling used batteries to support the circular economy.‬ ‭For instance, Green Li-ion, a Singaporean startup, has developed modular processing‬ ‭plants that use co-precipitation hydrometallurgical technology to recycle lithium-ion‬ ‭batteries and produce high-purity battery cathodes. This method not only enhances‬ ‭purity but also reduces production time, eliminating the need for battery sorting.‬

‭ chion Technologies, based in the UK, has created a proprietary anode material‬ E ‭using mixed niobium oxide (XNO) technology. This material, designed with‬ ‭microcrystals to diffuse lithium ions, allows for super-fast charging without‬ ‭nanosized powders. Applications for these high-energy-density anodes range from‬ ‭consumer electronics to electric vehicles [In addition to these examples, Alsym‬ ‭Energy, a Boston-based startup, is developing non-flammable, lithium- and‬ ‭cobalt-free rechargeable batteries. Their water-based electrolyte and non-toxic‬ ‭materials make their batteries safer and more suitable for various applications, from‬ ‭utility grids to industrial uses.‬ ‭ oreover, AI is increasingly being integrated into lithium-ion battery technology to‬ M ‭optimize performance, predict failures, and improve battery management systems,‬ ‭thus enhancing efficiency and safety These advancements reflect a promising future‬ ‭for lithium-ion batteries, with significant implications for energy storage across‬ ‭various sectors.‬ ‭LITHIUM ALTERNATIVES‬ ‭ ithium batteries face environmental concerns and supply limitations, prompting‬ L ‭companies to explore alternative battery materials for future energy storage‬ ‭solutions. Zinc-air batteries are emerging as a strong alternative due to zinc’s‬ ‭abundance, stability, and low toxicity. Sodium-sulfur batteries also present an‬ ‭efficient alternative, offering long lifespans, high energy density, and greater‬ ‭charge/discharge cycles while being made from relatively inexpensive materials.‬ ‭Other promising chemistries include aluminum-ion, magnesium-ion, nickel-zinc, and‬ ‭silicon-based batteries.‬ ‭ or instance, Offgrid Energy Labs, an Indian startup, has developed ZincGel, a‬ F ‭proprietary zinc-based battery technology that uses a highly conductive zinc‬ ‭electrolyte and carbon-based cathode. This electrolyte is self-healing,‬ ‭temperature-stable, and non-evaporative, ensuring a longer lifespan and high‬ ‭efficiency. This technology is particularly beneficial for two-wheeler EV‬ ‭manufacturers seeking a safe, eco-friendly, non-flammable, and sustainable‬ ‭alternative to lithium-ion batteries.Altris, a Swedish startup, creates Fennec, a‬ ‭cathode material for sodium-ion batteries using patented low-temperature and‬ ‭pressure synthesis technology.‬ ‭ ennec offers a low-cost, sustainable alternative to traditional electrode materials‬ F ‭without compromising performance. This solution is easily integrated into existing‬ ‭production lines and is applicable in areas such as photochromic windows.‬ ‭Companies like Ambri are developing liquid metal batteries that use antimony and‬ ‭calcium. These batteries are designed for grid-scale energy storage, providing‬ ‭long-duration storage with low costs and extended cycle life. Similarly, Sila‬ ‭Nanotechnologies is working on silicon-based anodes to replace graphite in‬

l‭ithium-ion batteries, significantly increasing energy density and improving‬ ‭performance.‬

‭SOLID STATE BATTERIES‬ ‭ olid-state batteries are a promising advancement in battery technology, replacing‬ S ‭the flammable liquid electrolyte found in conventional batteries with a solid‬ ‭compound, such as polymers or organic compounds, that facilitates ion migration.‬ ‭These solid electrolytes offer higher ionic conductivity and improve operational‬ ‭efficiency, especially in extreme temperatures. Moreover, solid-state batteries‬ ‭support the use of high-voltage, high-capacity materials for manufacturing, resulting‬ ‭in greater energy density, portability, and shelf life. Due to their superior‬ ‭power-to-weight ratio, they are particularly well-suited for use in electric vehicles‬ ‭(EVs).‬ ‭ or example, SSB Incorporated, a US-based startup, specializes in polymer-based‬ F ‭solid-state electrolyte materials. Their solid electrolyte, which combines polymers‬ ‭and ionic materials, enhances ion mobility and offers high energy density, improved‬ ‭electrochemical performance, and thermal stability. These solid-state separators‬ ‭enable the packaging of electrolytes into lithium batteries, suitable for various‬ ‭applications, including vehicles and aircraft.‬ ‭ imilarly, Theion, a German startup, develops solid-state crystal sulfur batteries using‬ S ‭direct crystal imprinting (DCi) technology to create wafers from molten sulfur. Their‬ ‭proprietary solid-state polymer electrolyte operates within these wafers, with lithium‬ ‭metal foil serving as the anode.‬ ‭ he advantages of this technology include long cycle life, rapid charging, low cell‬ T ‭cost, and enhanced safety, making it suitable for applications ranging from‬ ‭smartphones and laptops to energy storage in vehicles and aircraft. QuantumScape,‬ ‭a US-based startup that focuses on developing solid-state lithium-metal batteries.‬ ‭Their unique solid-state separator, made of a ceramic material, enables high energy‬ ‭density and rapid charging capabilities. Quantum Scape’s batteries have the potential‬ ‭to revolutionize electric vehicles by offering increased range and shorter charging‬ ‭times.‬ ‭ nother notable player in the field is Ionic Materials, also based in the US, which‬ A ‭specializes in polymer-based solid-state electrolytes. Their polymer electrolyte‬ ‭materials exhibit high ionic conductivity and excellent stability, making them suitable‬ ‭for various battery applications, including electric vehicles, consumer electronics,‬ ‭and grid storage. Additionally, Solid Power, a US-based startup, is developing‬ ‭solid-state batteries using a sulfide-based electrolyte. Their solid-state batteries offer‬ ‭high energy density, improved safety, and long cycle life, making them ideal for‬ ‭electric vehicle applications.‬

‭BATTERY ENERGY STORAGE‬ ‭SYSTEMS (BESS)‬ ‭ attery Energy Storage involves employing rechargeable batteries to store electrical‬ B ‭energy for future use. These systems store surplus electricity during times of low‬ ‭demand or when energy from sources like solar and wind is abundant. Later, they‬ ‭discharge this stored energy during peak demand periods or when renewable‬ ‭sources are not actively generating power. Battery energy storage systems are‬ ‭indispensable for stabilizing electrical grids, facilitating the integration of renewable‬ ‭energy sources, offering backup power during outages, and enhancing the overall‬ ‭efficiency of electricity usage.‬ ‭ hey find application across a wide range of settings, including residential,‬ T ‭commercial, and utility-scale installations. Battery Energy Storage Systems (BESS)‬ ‭are essential for storing excess electricity generated by renewable sources during‬ ‭periods of low demand and discharging it during peak demand or when renewables‬ ‭are inactive. These systems play a critical role in stabilizing electrical grids,‬ ‭integrating renewable energy, providing backup power during outages, and improving‬ ‭overall electricity efficiency across various sectors.‬ ‭ lbion Technologies, a UK-based startup, specializes in Smart Battery Energy‬ A ‭Storage Systems tailored for renewable energy providers, developers, and grid‬ ‭operators. Their product, Smart BESS, is a containerized system designed to‬ ‭optimize battery lifetime and deliver over 90% usable energy. It offers flexibility in‬ ‭deployment and integration with other units to meet diverse power and energy needs‬ ‭while complying with UK national grid standards.Similarly, Genista Energy, another‬ ‭UK-based startup, focuses on lithium-iron phosphate-based BESS design.‬ ‭ heir system, consisting of large containers with multiple battery strings, is scalable‬ T ‭and suitable for providing power in remote areas. Genista Energy targets industrial‬ ‭and commercial buildings, offering renewable energy management solutions and an‬ ‭eco-friendly alternative to diesel generators.In addition to Albion Technologies and‬ ‭Genista Energy, other companies are making significant contributions in this field.‬ ‭For example, Tesla Energy offers Powerpacks and Megapacks, large-scale battery‬ ‭energy storage solutions designed for utilities, commercial, and industrial‬ ‭applications. These systems can be used for peak shaving, load shifting, and‬ ‭renewable integration, enhancing grid stability and reducing reliance on fossil fuels.‬ ‭Another notable player is Fluence, a joint venture between Siemens and AES,‬ ‭specializing in energy storage technology and services.‬

‭ heir Advancion platform offers scalable, grid-connected battery storage solutions‬ T ‭that help utilities manage peak demand, increase renewable energy penetration, and‬ ‭improve overall grid reliability.Furthermore, Sonnen, now a part of Shell, provides‬ ‭residential and commercial battery energy storage solutions, enabling homeowners‬ ‭and businesses to store excess solar energy and reduce reliance on the grid during‬ ‭peak times. Their systems also offer backup power capabilities, enhancing energy‬ ‭resilience at the individual level.‬

‭ENHANCED REDOX FLOW‬ ‭BATTERIES (RFB)‬ ‭ edox flow batteries serve as versatile solutions for both fuel cells and rechargeable‬ R ‭batteries, featuring interconnected tanks with electrolyte liquids and oppositely‬ ‭charged electrodes. Ions traverse between the tanks via a membrane, offering‬ ‭extended lifespans compared to lithium batteries as the membrane isn’t degraded by‬ ‭current flow. Their adaptable design and scalability make them ideal for large-scale‬ ‭integration of renewable energy, with ongoing advancements focusing on‬ ‭cost-effective redox chemistries with increased energy density.‬ ‭ L Batteries, a US-based startup, specializes in saltwater-based flow batteries that‬ X ‭are non-corrosive. By utilizing organic molecules from inexpensive industrial‬ ‭feedstock for charge storage, XL Batteries offer independent sizing through separate‬ ‭stack electrodes during charging and discharging. Their mild saltwater chemistry‬ ‭makes these batteries more affordable than vanadium flow batteries, appealing to‬ ‭the utility industry as a lithium-ion battery alternative. Similarly, StorEn Technologies,‬ ‭also based in the US, focuses on vanadium flow battery technology. Leveraging‬ ‭vanadium’s properties, they produce batteries with only one electroactive element,‬ ‭eliminating metal cross-contamination and mitigating decay and capacity loss‬ ‭issues seen in lithium batteries.‬ ‭ torEn Technologies’ batteries find applications in telecom tower batteries, drawing‬ S ‭power from both the electrical grid and renewable sources in off-grid locations.‬ ‭Another example comes from US-based startup ViZn Energy Systems, which‬ ‭specializes in zinc-based flow batteries. Their batteries utilize zinc and iron‬ ‭chemistry, offering advantages in terms of cost-effectiveness, safety, and‬ ‭environmental impact.‬ ‭ iZn’s systems find applications in renewable energy storage, grid stabilization, and‬ V ‭microgrid installations. ESS Inc., also based in the US, develops iron flow batteries‬ ‭for energy storage applications. Their iron flow battery technology utilizes simple,‬ ‭low-cost chemistry based on iron electrolytes, offering advantages in terms of safety,‬

l‭ongevity, and sustainability. ESS Inc.’s systems are deployed in various settings,‬ ‭including utility-scale energy storage, renewable integration, and commercial and‬ ‭industrial applications.‬

‭SHORT TERM RESPONSE‬ ‭ENERGY STORAGE DEVICES‬ ‭ hort-term response energy storage devices (SDES), such as supercapacitors,‬ S ‭flywheels, and superconducting magnetic storage systems, have a rich history of‬ ‭application. These devices, renowned for their ability to deliver rapid bursts of power,‬ ‭serve as linchpins in fortifying power grid stability during transient events like system‬ ‭disturbances, load fluctuations, and line switches.SDES are indispensable in averting‬ ‭power grid collapse due to voltage instability. Startups are integrating SDES into fuel‬ ‭cell applications to bolster the charge-discharge cycles of electric vehicles, while‬ ‭cities are intertwining energy storage systems with SDES, yielding notable‬ ‭enhancements in overall energy storage capacity and charge cycles.‬ ‭ or instance, KINETIC, which pioneers flywheel technology, offers solutions that‬ F ‭harness rotational energy for short-term power needs. Additionally, companies like‬ ‭MAGNETIX leverage superconducting magnetic storage systems, providing‬ ‭high-density energy storage solutions with rapid response time. Similarly, GODI, an‬ ‭Indian startup, manufactures hybrid capacitors from biowaste-derived materials.‬ ‭These capacitors combine activated carbon and graphene to provide short-term‬ ‭peak power required for rapid charging. This solution extends from individual cells to‬ ‭modules, finding applications in automotive, renewable energy, and regenerative‬ ‭braking systems.‬

‭HYDROGEN STORAGE‬ ‭ ydrogen storage is vital for its use as a clean and renewable energy source, with‬ H ‭startups pioneering innovative methods to store hydrogen efficiently and safely.‬ ‭ ne such example is H2GO Power, a UK-based startup that specializes in developing‬ O ‭hydrogen energy storage solutions using a solid-state hydrogen carrier. Their‬ ‭technology involves storing hydrogen in a chemical compound, enabling safe and‬ ‭compact storage with high energy density. H2GO Power’s solid-state hydrogen‬ ‭storage systems have applications in various industries, including transportation,‬ ‭energy storage, and portable power. Another notable player in the field is HySiLabs, a‬ ‭French startup that focuses on producing solid-state hydrogen storage materials‬ ‭using a silicon-based process.‬

‭ heir technology enables the storage of hydrogen at room temperature and low‬ T ‭pressure, offering a cost-effective and scalable solution for hydrogen storage.‬ ‭HySiLabs’ solid-state hydrogen storage materials can be integrated into fuel cell‬ ‭vehicles, stationary power systems, and renewable energy storage applications.‬ ‭Hexagon Purus, a Norwegian company, specializes in designing and manufacturing‬ ‭high-pressure hydrogen storage tanks for fuel cell electric vehicles (FCEVs) and‬ ‭other hydrogen-powered applications. Their lightweight composite tanks offer high‬ ‭durability, safety, and storage capacity, enabling efficient and reliable hydrogen‬ ‭energy storage solutions for various transportation and industrial applications.‬

‭ADVANCED THERMAL ENERGY‬ ‭STORAGE (TES)‬ ‭ dvanced Thermal Energy Storage is essential for efficiently managing high levels of‬ A ‭variable renewable electricity production by storing heat, both seasonally and‬ ‭short-term, for later use. Traditionally, heating companies have relied on insulated‬ ‭tanks to store hot or cold water, which is then used to meet increased demand‬ ‭during peak periods in district heating and cooling systems. Recent advancements‬ ‭have introduced innovative mediums like molten salts, eutectic materials, and‬ ‭phase-changing materials to store heat energy more effectively. Thermal energy‬ ‭storage finds widespread application in solar thermal systems, addressing the‬ ‭challenge of intermittency by enabling access to stored solar power during periods‬ ‭of low sunlight or at night.‬ ‭ or instance, HeatVentors, a Hungarian startup, specializes in Phase Changing‬ F ‭Material (PCM)-based thermal storage systems. Their product, HeatTank, utilizes‬ ‭phase change materials to store thermal energy through melting and solidification‬ ‭processes. This approach not only saves space, energy, and costs but also enhances‬ ‭the efficiency of heating, ventilation, and air conditioning (HVAC) systems, improving‬ ‭stability and peak performance management. Similarly, Cowa Thermal Solutions, a‬ ‭Swiss startup, offers capsule-filled heat tanks for thermal energy storage. Their‬ ‭solution, BOOSTER CAPSULES, utilizes naturally occurring salts to provide three‬ ‭times the storage capacity of conventional water storage tanks without sacrificing‬ ‭capacity or stability.‬ ‭ his energy-dense heating tank reduces reliance on the main power grid, making it‬ T ‭ideal for integration with photovoltaic (PV) systems in the distributed energy industry‬ ‭to ensure continuous heating. Additionally, companies like Azelio, based in Sweden,‬ ‭are pioneering the development of long-duration thermal energy storage systems‬ ‭using recycled aluminum as a heat storage medium. Their technology enables‬

‭ ost-effective and scalable storage of renewable energy, contributing to grid stability‬ c ‭and sustainability goals.‬

‭DISTRIBUTED STORAGE‬ ‭SYSTEMS‬ ‭ raditional energy systems are typically centralized, posing risks of grid failures‬ T ‭during periods of high demand. Distributed storage systems, however, offer a‬ ‭solution by allowing individual facilities to generate and store energy on-site for their‬ ‭use, reducing reliance on centralized infrastructure. These systems also enable‬ ‭energy producers to sell excess energy back to the grid. Distributed energy storage‬ ‭solutions like electric vehicles (EVs), microgrids, and virtual power plants (VPPs) play‬ ‭a key role in reducing the need for coal, oil, and gas energy generation.‬ ‭ dditionally, they promote greater reliance on renewables by integrating local energy‬ A ‭storage solutions such as rooftop solar panels and small wind turbines. For instance,‬ ‭Belgian startup MET3R is advancing Vehicle-to-Grid (V2G) management through‬ ‭platforms like ZenCharge, ZenSite, and ZenGrid, which utilize artificial intelligence‬ ‭(AI) to optimize fleet charging and minimize the grid’s impact. These platforms also‬ ‭offer insights into managing loads related to EV charging, benefiting energy‬ ‭distribution companies by providing real-time monitoring of distributed energy‬ ‭assets (DERs) on low-voltage networks.‬ ‭ n Australian startup Karit provides virtual power plants (VPPs) by aggregating‬ A ‭distributed energy assets such as generation and storage systems. By consolidating‬ ‭these assets, energy retailers can ensure efficient power supply to customers while‬ ‭channeling surplus energy into the market. VPPs enable predictive energy storage‬ ‭and management, benefiting energy retailers and multi-site organizations alike.‬ ‭ ne example comes from US-based startup Stem, which offers distributed energy‬ O ‭storage solutions for commercial and industrial customers. Their systems use‬ ‭predictive analytics and artificial intelligence to optimize energy usage, reduce‬ ‭demand charges, and provide backup power during peak periods. Stem systems help‬ ‭customers save on energy costs while enhancing grid stability. Another example is‬ ‭Orison, a US-based company that offers plug-and-play energy storage solutions for‬ ‭residential and small commercial properties. Their modular batteries can be easily‬ ‭installed and expanded, allowing homeowners and businesses to store excess‬ ‭energy from renewable sources like solar panels and use them when needed.‬ ‭ rison’s systems help reduce electricity bills and promote energy independence.‬ O ‭Additionally, Enel X, a global energy company, provides distributed energy storage‬ ‭solutions through its JuiceNet platform. JuiceNet allows customers to manage and‬

‭ ptimize their energy usage, integrate renewable energy sources, and participate in‬ o ‭demand response programs. Enel X’s solutions help reduce energy costs, lower‬ ‭carbon emissions, and improve grid reliability.‬

‭ENERGY STORAGE As A‬ ‭SERVICE‬ “‭ Energy storage as a service” refers to a business model where companies provide‬ ‭energy storage solutions to customers on a subscription or pay-for-use basis, rather‬ ‭than requiring them to purchase and maintain the storage infrastructure outright.‬ ‭This approach allows businesses to access the benefits of energy storage, such as‬ ‭backup power, demand management, and grid support, without the upfront capital‬ ‭investment typically associated with purchasing storage systems.‬ ‭ ustomers pay a periodic fee for the use of the storage service, which can include‬ C ‭installation, maintenance, and monitoring of the storage system. This approach‬ ‭provides maximum flexibility, allowing businesses to adapt to changing market‬ ‭conditions. Energy Storage as a Service also supports utilities in managing‬ ‭congestion, addressing peak demand, and enhancing grid resilience. Additionally, it‬ ‭benefits consumers in remote areas with limited grid connectivity by improving grid‬ ‭efficiency and flexibility.‬ ‭ or example, Danish startup Hybrid Greentech provides HERA, an AI-driven energy‬ F ‭storage management platform. HERA combines optimization models and machine‬ ‭learning algorithms to optimize the operation of energy storage assets. This‬ ‭technology enables detailed expense modeling during the initial stages of project‬ ‭development, helping businesses make informed investment decisions across‬ ‭various industries, including hybrid power plants, microgrids, and electric mobility.‬ ‭ imilarly, Renon India offers ARK, a smart battery management system designed for‬ S ‭commercial and industrial applications. ARK ensures the safety, efficiency, and‬ ‭performance of battery packs through passive cell balancing and temperature‬ ‭sensing. These systems are particularly suited for storing solar energy in various‬ ‭settings.‬

‭Conclusion‬ ‭ ontinued efforts and innovations in energy storage solutions are essential for‬ C ‭maximizing the effectiveness of renewable energy sources. They address the‬ ‭intermittent nature of renewables, ensuring a reliable power supply. By storing‬ ‭excess energy, they optimize renewable energy utilization, reduce reliance on fossil‬

f‭ uels, and improve grid stability. Innovative technologies from startups are driving‬ ‭progress in energy storage, paving the way for a cleaner and more sustainable‬ ‭energy future.‬ ‭ o facilitate understanding of the latest developments and trends in the Renewable‬ T ‭energy Industry, various Conferences and Expos, which bring Industry leaders‬ ‭together, are crucial. The Energy Evolution Awards, Conference, and Expo organized‬ ‭by Next Business Media is making its debut in Spain in 2025. It will be a leading‬ ‭forum dedicated to honoring excellence in Energy Technology, showcasing‬ ‭innovations, and fostering collaborations.‬ ‭ he events unite industry leaders, and visionaries to explore the latest‬ T ‭advancements, tackle key challenges, and shape the future of Energy. The Energy‬ ‭Evolution Awards, Conference, and Expo will celebrate outstanding achievements,‬ ‭promote sustainable practices, and drive the Energy Industry forward into a‬ ‭technologically advanced sustainable era. Energy Evolution Awards, Conference, and‬ ‭Expo will be a platform for cultivating innovation and shaping a brighter, more‬ ‭efficient energy landscape.‬