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Hyme Energy has inaugurated a molten hydroxide salt energy storage project in Denmark, the first such deployment in the world, it claimed.
The system has been built as part of a project called ‘Molten Salt Storage – MOSS’, located in Esbjerg, Denmark, and is the world’s first MW-scale thermal energy storage unit based on molten hydroxide salt, technology provider Hyme claimed.
After an inauguration ceremony the facility will be put into operation to demonstrate its ability to store energy charged from renewable power, which it can then discharge as heat or steam for either industry or the electricity system. Molten hydroxide generally melts at lower temperature than other kinds of salt, with Hyme claiming it is the first technology provider to enable its use for thermal energy storage.
Hyme is not the only company deploying molten salt energy storage projects at MW-scale in Denmark, however. Kyoto Group said in August 2023 that it was undergoing testing for its 4MW/18MWh molten salt energy storage project at the Nordjylland Power Station in Aalborg.
One-fifth of global greenhouse gas emissions are from industrial heat, according to the International Energy Agency (IEA).
The project has an energy storage capacity of 1MWh with a discharge capacity of 1.2MW of steam. It has been built at a port facility owned by Semco Maritime, a construction and engineering firm.
Other companies involved in the MOSS project were industrial product firm Alfa Laval, design studio Kirt x Thomsen, Swiss engineering firm Sulzer and nuclear technology firm Seaborg. Innovation network Energy Cluster Denmark facilitated the project with financial support from Denmark’s Energy Technology Development and Demonstration Program (EUDP).
See a video illustration of how the MOSS project works below, from Hyme Energy on .
The company has further plans to build a project at the GWh-scale in future as part of an aim to commercialise its solution in 2026.
The energy and fibre-optic group Andel invests DKK 75m (EUR 10m) in Stiesdal Storage Technologies. The ambition is to take pumped thermal electricity storage to a new level.
The green transition is well under way, and increasingly larger energy volumes are produced from renewable energy sources such as wind and solar. Many expect that in just 10 years our electricity will be fully based on renewable energy sources. But when the sun does not shine, the wind does not blow and the traditional power plants are no longer in operation, what do we do, then? That is one of the great challenges in the green transition and to this end, pumped thermal electricity storage is a strong option.
Electricity from hot stonesThe potential of storing energy in stones has been documented in two Danish innovation projects performed at DTU Risø by Andel and Stiesdal Storage Technologies, respectively. In both projects, electricity is stored as heat in stones – and the heat can then be used to produce electricity when needed.
Through the projects at Risø the level of knowledge on large-scale storage was elevated from an idea into something that is realistic and technically feasible. Andel has been looking for a strong industrial partner for the further development, and its CEO Jesper Hjulmand is very pleased with the partnership with Stiesdal Storage Technologies:
"I am very much looking forward to starting a close collaboration with Henrik Stiesdal and his colleagues. Henrik is a pioneer who has taken part in the green transition since 1976, and his company represents a very special technological competence. We must now jointly complete a prototype, which can subsequently be tested and displayed. It is a strategic match for Andel that we strengthen our focus on energy storage. That is the way forward if we want to achieve full integration of renewable energy and the electrification of society", says Jesper Hjulmand.
Commercial solution on the wayHenrik Stiesdal has worked on energy storage since 2010 and is also looking forward to the partnership:
Inexpensive and efficientOle Alm, Head of Development at Andel and responsible for the company''s work on energy storage has big expectations for the new storage facility:
"Stone is an inexpensive and sustainable material, which can store large volumes of energy taking up only a little space, and it can withstand innumerable rounds of charging and discharging of the storage. We know this from our tests at the Risø facility. We must now create units that are flexible and relatively easy to handle. They can be placed at solar farms and offshore wind farms, at substations and industrial facilities, and perhaps on the future wind energy islands. For this, we need an industrial partner like Stiesdal Storage Technologies so that together we can create functional large-scale solutions".
Peder Riis Nickelsen, CEO of Stiesdal Storage Technologies is looking forward to the next step in the project:
"Commercially sustainable storage of large volumes of energy requires a very inexpensive storage medium and that the supplementary equipment can be mass produced. Our "GridScale" technology fulfils both of these criteria. The cost of crushed stone is at a totally different level per unit of energy than practically any other material for energy storage. Besides, our charging and discharging system can utilise well-known technologies that have been applied for a century within other industries and are is well-suited for mass production. Thus, we see great opportunities in the concept, both in Denmark and particularly in the export markets".
It has not yet been finally decided where the first prototype storage facility should be placed and tested. However, it is certain that it will be on South or West Zealand or on Lolland-Falster, where in particular the production from new large solar power facilities is increasing without being matched by consumption. Thus, the energy produced must be able to be stored or transported to avoid bottlenecks in the electricity grid, which lead to production stops from renewable energy sources.
Additional support from the Danish Energy AgencyTo further accelerate the development, a consortium of eight Danish project partners has been granted a subsidy from the Energy Technology Development and Demonstration Program (EUDP) under the Danish Energy Agency.
The innovation project, GridScale – a Cost-effective Large-scale Power to Power Storage, spans three years and has a budget of DKK 35 million. In addition to Stiesdal and Andel, the partnership includes Aarhus University (AU), the Technical University of Denmark (DTU), Welcon, BWSC, Energi Danmark and Energy Cluster Denmark. The partners are to produce an energy system analysis and a design optimisation of the hot stone storage facility.
Among other things, the partners will combine the model for the European energy system developed by Aarhus University with DTU''s model for optimisation of gas turbines to gain insight into the potential role of hot stone energy storage in a European context and also to optimise an ideal design:
"The objective is to establish how hot stone energy storage can best help Denmark''s and Europe''s green transition. The ambition is to have an alternative ready for implementation on wind energy islands and many other locations with the need for storage of renewable energy", says CEO Glenda Napier, Energy Cluster Denmark.
Andel is Denmark''s leading energy and fibre-optic group. We are also a cooperative society and a group with subsidiaries. The purpose of Andel is to create value for our customers and cooperative owners. We create welfare and growth regionally and in society in general by providing vital infrastructure and future-proof energy solutions. We create energy to live life.
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