immo!nvest – Die Plattform für Standorte und Immobilien

Tag: Energiespeicher

  • District heating networks are becoming increasingly important for urban energy supply

    District heating networks are becoming increasingly important for urban energy supply

    Researchers at Lucerne University of Applied Sciences and Arts (HSLU) are working on the development of seasonal thermal energy storage systems. In an era of global warming, thermal networks are becoming increasingly important for cooling densely built-up cities. This involves circulating water from lakes or rivers through pipe systems to cool buildings; these same systems are then used for district heating in winter. To drive the development of such systems forward, the university organised an event to share experiences. According to a press release, the 22nd IGE Seminar of the Institute for Building Technology and Energy (IGE) took place on 11 March 2026. Representatives from Thermische Netze Schweiz,WWZ Energie AG (Zug), Wien Energie GmbH and the City of Zurich, with their CoolCity Zurich project, also took part in the presentations and discussions.

    At HSLU, flexible heat storage systems are being developed that adapt to changing conditions. Researchers led by Timotheus Zehnder demonstrated how firewood can be used more efficiently in wood-fired systems thanks to flue gas cooling and condensation. Three speakers presented thermal networks for heating and cooling supply in Zug, Zurich and Vienna.

    Dieter Kissling from the ifa Institute for Occupational Medicine raised an interesting point: office temperatures were adjusted in the 1960s to suit the needs of men (21 to 22 degrees Celsius). However, it has been shown that women are more productive at 26 to 27 degrees Celsius. With a higher proportion of women in the workforce, it is worth considering whether room temperatures should be adjusted.

    The diversity of topics demonstrated that climate change poses further challenges. The 23rd IGE Seminar has already been scheduled for 10 March 2027.

  • Solar project combines own electricity and regional investment

    Solar project combines own electricity and regional investment

    According to a press release, the Schloss Turbenthal Foundation is enabling private individuals and companies to participate in its new solar power plant. This plant is being built on the roofs of the village for the deaf. With 150 solar modules, it is expected to generate 66,000 kilowatt hours of electricity per year. Half of the electricity will be consumed by the foundation itself.

    A large battery with a capacity of 100 kilowatts will allow electricity to be stored on days when there is plenty of sun and little demand. This electricity can then be accessed later by both the foundation and the grid company Swissgrid as balancing energy.

    Private individuals and companies can participate in the plant via the solarify.ch platform. They receive quarterly payments on their investment. “With this project, we are making a concrete contribution to sustainability and enabling the participation of the population from the region,” Marc Basler, general manager of the Schloss Turbenthal Foundation, is quoted in the press release.

    Solarify GmbH, based in Bern, is also responsible for project management, operation, insurance and maintenance of the plant, as well as electricity marketing.

  • Electricity industry warns of declining security of electricity supply

    Electricity industry warns of declining security of electricity supply

    According to a press release, the Association of Swiss Electricity Companies (VSE) has presented the Swiss Electricity Supply Index for the first time. The index rates Switzerland’s electricity supply at 82 points for 2035 and only 69 points for 2050.

    The index assesses the electricity supply in five categories. Per capita electricity demand is set to rise further, mainly due to electromobility and data centres; the index gives a score of 86 points for 2050. The expansion of renewable energies is too slow, especially for winter supply. Solar panels on roofs are not sufficient for this, and projects in wind and hydroelectric power production are being delayed or cancelled. The index gives 83 points for 2050. The flexibility of the electricity system is rated at only 52 points for 2050. The federal target for the expansion of seasonal storage will be significantly missed. The expansion of electricity production receives 63 points. The phasing out of domestic nuclear power from 2040 onwards will increase demand. The expansion of the grids is rated at only 57 points.

    In its statement, the VSE points out that imports cannot be increased at will and do not offer any security in times of shortage. “Switzerland is at a decisive crossroads: without decisive energy policy decisions, concrete investments in new production capacities and a significant acceleration of the approval process, we are putting our security of supply at risk,” VSE President Martin Schwab is quoted as saying in the statement.

  • New storage concept for stable power grids presented

    New storage concept for stable power grids presented

    The Zug-based greentech company PLAN-B NET ZERO and its subsidiary PLAN-B NET ZERO BESS GmbH presented their new concept for an energy storage system at this year’s D-A-CH Hydrogen Symposium at the Höhere Technische Bundeslehr- und Versuchsanstalt Wiener Neustadt. According to a company press release, it combines battery storage (Battery Energy Storage System, BESS), green hydrogen and artificial intelligence (AI) to create an integrated, flexible energy system that stabilises power grids and increases security of supply.

    Tjark Connor Hennings-Huep, battery systems expert at PLAN-B NET ZERO, argued at the symposium that class A grid planning is no longer sufficient in Germany, Austria and Switzerland because volatile feed-in of energy from wind and photovoltaics, slow grid expansion and increasing weather extremes are putting a strain on grid stability: “We need intelligent decentralised systems that can react independently to fluctuations.”

    As the company emphasises, it does not see combined battery-hydrogen solutions as competition to other systems, but rather as a complementary building block in a more resilient energy system for regional energy centres. “Together, both technologies form the bridge to a robust, fully renewable energy system and, when combined, offer additional parameters in terms of control and flexibility,” says Hennings-Huep.

    Battery storage and hydrogen are complemented by AI-supported forecasting and control algorithms that dynamically balance generation, storage and consumption. “Our goal,” says the expert, “is an energy system that stabilises itself – digital, decentralised and decarbonised.”

  • Billion-euro investment drives expansion of energy storage systems

    Billion-euro investment drives expansion of energy storage systems

    Energy Vault announces the foundation of its subsidiary Asset Vault. This is to be financed by a preferred equity investment of USD 300 million from an unnamed multi-billion dollar infrastructure fund. According to a press release, the Lugano and California-based developer of energy storage systems expects this to release more than 1 billion dollars in investment. The aim is to accelerate the deployment of energy storage projects with a newly installed capacity of 1.5 gigawatts in the USA, Europe and Australia.

    Asset Vault will reportedly be dedicated to developing, building, owning and operating energy storage assets in the world’s most attractive energy markets, either independently or in conjunction with generation assets. Crucially, Energy Vault will retain voting and operational control of Asset Vault. Energy Vault expects the transaction to close within the next 30 to 60 days. Asset Vault will then be established as a fully consolidated subsidiary. All energy storage facilities, which are secured by long-term purchase agreements and which guarantee the monetisation of the projects, are to be bundled in this subsidiary. Asset Vault is expected to generate recurring EBITDA of over 100 million dollars over the next three to four years, complementing Energy Vault’s existing energy storage business.

    This “unlocks the full potential of our own-and-operate strategy for storage IPP with immediate investment flexibility,” Robert Piconi, Chairman and CEO of Energy Vault, is quoted as saying. “By combining long-term contracted revenue with strategic capital and integrated, self-executed project delivery, we are well positioned to scale a resilient, mission-critical energy infrastructure to meet the current demands of renewable energy expansion and the massive increase in energy demand from data centre AI infrastructure.”

  • Virtual power plant from solar systems and electric cars

    Virtual power plant from solar systems and electric cars

    “Switzerland’s first virtual power plant for private customers is live” is the title of a post by Helion Energy AG on LinkedIn. The energy company, which will be acquired by the AMAG Group in 2022, wants to combine thousands of small privately owned energy sources into an intelligent virtual power plant. The individual solar systems, home batteries and electric cars will be networked by the Helion ONE platform.

    “Just a third of today’s PV systems could replace a pumped storage power plant,” writes Helion Energy. The plan is to use the decentralised large-scale power plant in the balancing energy market to stabilise the electricity grid. The grid is currently being tested for this purpose in collaboration with Swissgrid AG.

    Private households that participate in the virtual power plant can benefit from earnings of between 200 and 300 francs per year. For SMEs, the amount is currently over CHF 1,000 and rising, according to the article. Helion wants to enable other interested parties to participate in the decentralised large-scale power plant before the end of this year.

  • Researchers develop commercially viable salt batteries for safe energy storage

    Researchers develop commercially viable salt batteries for safe energy storage

    Researchers from the Dübendorf-based Materials for Energy Conversion Laboratory of the Swiss Federal Laboratories for Materials Science and Technology(Empa) are continuing an Innosuisse project started by Ticino-based salt battery manufacturer Horien Salt Battery Solutions. The aim of the research collaboration is to develop economically attractive and usable salt batteries, according to a press release. Salt batteries are batteries in which the electrolyte is a solid, namely a ceramic ion conductor based on sodium aluminium oxide. The cathode is based on a granulate of common salt and nickel powder. The sodium metal anode is only formed during charging. Unlike conventional lithium-ion batteries, salt batteries are not flammable. They can therefore be used in areas where lithium-ion batteries are not permitted, such as in mining and tunnelling or on oil and gas platforms. Further advantages are their longevity and the significantly cheaper procurement of the raw materials. In contrast to the lithium-ion competition, the raw materials are cheap and available in large quantities, according to the press release.

    One disadvantage of these batteries is their high operating temperature. To be ready for use, a salt battery requires a temperature of 300 degrees Celsius. The researchers are looking for options to make the applications more economical. “Depending on the application, it is more economical to keep a battery warm than to cool it,” Empa researcher Meike Heinz is quoted as saying in the press release.

    Another endeavour is to operate the solid-state batteries nickel-free. The aim is to replace the cathode material nickel with other metals such as zinc. The aim is to establish salt batteries as long-term stationary storage systems thanks to their safety, long service life and the absence of critical raw materials.

  • New white paper: ‘Energy storage systems for properties: Using renewable energy efficiently’

    New white paper: ‘Energy storage systems for properties: Using renewable energy efficiently’

    Link to the whitepaper

    Switzerland is aiming for a target of net zero by 2050. This means replacing fossil-based energies with renewables. However, the output from systems is dependent on weather conditions, the time of day, and the season. Getting supply and demand in sync calls for storage solutions. This also improves the property’s carbon footprint, because it requires less oil or gas to cover peak loads.

    Electricity storage systems: battery-powered flexibility
    Battery storage systems can temporarily store surplus solar power locally and supply household consumers, electric vehicles or the heat pump later on. This significantly increases the level of self-consumption and with it the cost-efficiency of solar power plants. Not only the operator benefits from a storage system – the electricity grid does as well. This means, for example, that when a solar power plant produces a surplus, it doesn’t have to be shut off for fear of overloading the grid. And in the reverse scenario – when demand outstrips supply – locally stored energy can help cover peak loads, which stabilises the grid and keeps costs low. Currently the standard means of electricity storage is the lithium-ion battery, while alternatives such as sodium-ion batteries and salt batteries have yet to become established. This also applies to bidirectional charging, in which the battery of an electric vehicle is used for local electricity storage.

    Heat storage units: geothermal probes and containers
    One alternative to storing surplus solar power is to transform it into thermal energy. Heat can be stored over weeks or months and used later for heating and hot water supply as required. This makes heat storage a great fit with renewable heating systems such as heat pumps and thermal networks. And some types of storage system can be used as heat sinks in summer to cool buildings with minimal use of energy. The most common storage types in Switzerland are geothermal heat storage units and container heat storage units. One interesting variant that requires less space is ice storage.

    Hydrogen and methane: seasonal storage
    Another way to store surplus solar power seasonally is to transform it into a carbon-neutral gas like hydrogen or methane (‘power-to-gas’). If required, the gas can be used either to produce heat and electricity or as a fuel for vehicles. Hydrogen is produced through the electrolysis of water, and the degree of efficiency in this transformation is up to 80 per cent. Transforming it further into methane has the advantage that it can be stored in the natural gas grid, so it doesn’t require separate infrastructure. The overall degree of efficiency depends on the method used, but with a current best-case result of 50 to 70 per cent, it is not yet cost-effective.

    You can find much more information and real-life examples in the new ewz white paper ‘Energy storage systems for properties: Using renewable energy efficiently’.

  • global partnership for sustainable architecture

    global partnership for sustainable architecture

    The Lugano-based company Energy Vault, which specialises in sustainable energy storage solutions, is teaming up with the architecture and engineering firm Skidmore, Owings & Merrill(SOM) from Chicago, Illinois. According to a press release, this global partnership aims to integrate the gravity energy storage technology developed by Energy Vault into building design. Such gravity energy storage systems (GESS) in building architectures will enable faster amortisation of carbon in the construction and operation of buildings in the future.

    The plan is for SOM to act as the sole architect and civil engineer for all new gravity energy storage systems. Under the name G-VAULT, Energy Vault offers gravity-based energy storage systems for long-term storage. The company also focusses on the use of environmentally friendly and recycled materials for the transition to a circular economy with clean energy. In the future, G-VAULT will be integrated into tall buildings, urban environments and deployable structures in natural environments, according to the press release. Energy Vault has been working with SOM for the past twelve months to optimise the structure, architecture and economics of its technology.

    “We are very excited to begin this exclusive global partnership with Skidmore, Owings & Merrill, a firm with an unrivalled track record of developing some of the world’s most remarkable structures,” Robert Piconi, Chairman and Chief Executive Officer of Energy Vault, was quoted as saying in the press release. “This partnership with Energy Vault is not only a commitment to accelerate the world’s transition away from fossil fuels, but also to jointly explore how renewable energy architecture can enhance our shared natural landscapes and urban environments,” adds architect and one of the three lead SOM partners, Adam Semel.

  • Sustainability meets quality of life in Spiez

    Sustainability meets quality of life in Spiez

    This development not only meets the needs of singles, couples and families, but also takes into account the requirements of older people through special structural features. In realising the project, the focus is on both the quality of the construction and the use of sustainable materials, without losing sight of a fair price-performance ratio.

    The design of the residential complex is based on modern architectural principles. It consists of five cloverleaf-shaped main buildings and a final building. This configuration forms a central courtyard that is ideal for communal activities. Star-shaped paths provide access to further green and leisure areas. The project accommodates a total of 81 residential units, the majority of which are for rent and 35 units for sale, including four luxury penthouses and two studios.

    Away from the living spaces, the complex offers numerous amenities such as an underground car park with 96 parking spaces, bicycle and technical rooms and studios. But what makes this project stand out is its commitment to renewable energy. At its heart is an ice storage heating system that completely dispenses with fossil fuels. This innovative system utilises an underground water tank as an energy store, from which energy is generated by a heat pump. A solar air absorber optimises this process, making the project a pioneer in sustainable energy concepts.

  • Use of stationary hydrogen fuel cells to support the energy transition

    Use of stationary hydrogen fuel cells to support the energy transition

    Hydropower, photovoltaics and wind power are the mainstays of a renewable and ecologically sustainable energy infrastructure in Switzerland. However, the increased integration of solar energy and wind power into the electricity grid poses certain risks, as these energy sources are volatile in nature and thus pose a potential threat to the grid balance.

    The use of hydrogen offers a way to compensate for such energy fluctuations. Surplus, unpredictable solar and wind energy is not fed directly into the grid, but used to produce hydrogen by means of electrolysis. In times of energy shortage, for example caused by no wind and very cloudy weather in winter, the stored hydrogen can be used as an energy source.

    Since 2020, the Hälg Group has been working on the topic of “stationary hydrogen fuel cells in buildings”. In this context, a project team of three partner companies was formed: Osterwalder AG in St. Gallen is responsible for the production of green hydrogen through hydropower and its transport, H2Energy acts as a technology and production partner in the field of fuel cells, while the Hälg Group, as a provider of integral building technology and energy systems, is responsible for the planning, implementation and support of the entire building technology building. The vision of this project team is to create ideal energy networks in which environmentally friendly hydrogen as an energy storage medium fills the gaps left by other renewable energies.

    Stationary hydrogen fuel cell: a promising approach for a green energy economy
    The basis of the hydrogen fuel cell system has existed for almost two centuries. The increased use of hydrogen as an energy medium and substitute for fossil energy sources has led to significant further development of fuel cell technology in the recent past. The production method of hydrogen is essential for the ecological compatibility of this process. So-called “grey” hydrogen is produced by decomposing fossil fuels. Green” hydrogen, on the other hand, is produced by electrolysis of water using environmentally friendly energy sources such as hydropower, solar energy and wind power.

    By using only “green” hydrogen in the project group’s ecosystem, the stationary fuel cell generates electricity and heat in an environmentally friendly way. Hydrogen and oxygen are combined in the fuel cell. By applying electrical voltage between an anode and a cathode, the two elements react and combine to form water vapour. In the course of this, electrical energy and heat are also generated, which can be used directly to supply buildings and areas. The water produced in the process is reused.

    The hydrogen fuel cell is characterised by its environmental friendliness precisely because no pollutant emissions are produced or released in the course of the chemical reaction. Only pure, low-energy and harmless water vapour escapes as “waste gas”. Consequently, the function of the hydrogen fuel cell is considered to be completely emission-free.

    Advantages of the hydrogen fuel cell building technology solution

    • Maximises the value of the property and increases its attractiveness
    • Enhances the reputation of the facility owner and makes a progressive responsible statement on environmental protection, climate change and green transformation.
    • Emergency power supply in the building: partial or full self-sufficiency possible
    • Reduction of power and connection costs
    • Low maintenance costs due to non-moving parts
    • Modular design: from 80 kWel / 78 kWth, scalable as required.
    • Reduction of winter electricity demand, grid load, winter electricity gaps
    • Assistance in decarbonisation, environmental protection and reduction of greenhouse gases
    • Peak shaving of the electrical grid

    Ideal energy network
    It is important that energy producers and consumers have access to a wide range of environmentally friendly technologies. In addition to hydrogen fuel cells, these include heat pumps, chillers, solar thermal, wind energy and photovoltaics, as well as battery short-term storage and bidirectional e-vehicles. Further information at https://haelg.ch/stationaere-wasserstoff-brennstoffzelle/