Energy storage developments | Aggreko’s new small-footprint battery fleet


Aggreko has announced the launch of a new fleet of rental battery storage systems. These fully integrated units “will help customers to maintain a 100% reliable power supply while reducing the runtime of their thermal generators, leading to significant cost and emission savings”, says the company. The 30–90 kVA lithium-iron-phosphate (LFP) battery systems have been designed to offer a robust and highly mobile solution for users with varying needs and contract durations, regardless of their load profile.


Due to the units’ small footprint of 1.14m x 1.45m x 1.58m, and relatively modest weight of 1360 kg, they are suitable for numerous different


applications and uses for a large range of sectors globally, Aggreko says.


Benefits claimed for the new battery fleet include: up to 80% reduction in generator run time against thermal-only solutions; average 40-50% reductions in fuel costs and emissions, reaching up to 90% reductions for specific applications; significant reductions in generator O&M downtime and costs; avoidance of costly long-term CAPEX investments in fixed assets; flexibility arising from the availability of a range of lease durations, including long-term projects and installations.


Aggreko has been active in battery technology since the acquisition of Younicos in 2017. Recent


Energy Dome sees Ansaldo as a route to market


Energy Dome of Italy and Ansaldo Energia have signed an agreement aimed at bringing Energy Dome’s CO2


Battery and Energy


Transition Combined Cycle (ETCC) technology to market.


Battery as one of its product lines. Energy Dome is in the process of constructing a 2.5MW/4MWh CO2


in Sardinia. Energy Dome’s CO2 battery is seen as a long-


duration utility-scale energy storage concept. The process, “whilst groundbreaking, relies on tried and tested components that can be bought off the shelf”, says Energy Dome.


The company reasons that carbon dioxide is the perfect fluid to store energy cost effectively in a closed thermodynamic process as it is one of the few gases that can be condensed and stored as a liquid under pressure at ambient temperature, enabling a high energy density storage technology to be realised without the need to go to extreme cryogenic temperatures.


In charging mode the carbon dioxide is compressed and stored under pressure at ambient temperature in a high density supercritical or liquid state. When energy is to be released, the carbon dioxide is expanded into a turbine and then stored back into an atmospheric


With this agreement, Energy Dome says it “secures a reputable go-to-market channel ensuring a deep reach in selected markets.” Ansaldo Energia plans to integrate the ETCC into its gas turbine product portfolio and to offer the CO2


Battery demonstration plant


gasholder, the Dome, ready for the next charging cycle.


By storing in the liquid phase at ambient temperature “we significantly reduce the storage costs typical of CAES (Compressed Air Energy Storage) without having to deal with cryogenic temperatures as in the case of LAES (Liquid Air Energy Storage)”, says Energy Dome. Air, as employed in CAES, is not the perfect medium to store energy because its energy density under pressure is very low, the company notes. This means that to store energy cost effectively the only way is to use underground caverns, which make this system site dependent limiting its competitiveness.


LAES solves this problem by liquefying air, thus reaching very high energy densities. But this high energy density comes with a downside: the complexity of having to deal with cryogenic temperatures, making the system complex and therefore relatively expensive. Using CO2


projects include the successful deployment of a 500 kW lithium-ion unit in Turkey to support the national grid, as well as the implementation of a 48 kW ancillary battery storage solution at a residential project in the UK, which provided a 90% reduction in fuel consumption and noise pollution, allowing the project to operate without grid power.


The use of battery solutions forms an important part of Aggreko’s strategy to reduce local emissions and diesel emissions by 50% by 2030, the company says, as part of its commitment to become a net zero business across all operations and services by 2050.


inaugurated in France


RTE (Réseau de Transport d’Electricité), the French transmission system operator, and Nidec Industrial Solutions (NIS), have inaugurated “Ringo”, an experimental site for the automated management of large- scale electricity storage.


The location is in Vingeanne - Jalancourt, Côte-d’Or, France.


instead of air allows very high energy densities to be achieved, competitive with LAES, and also enables energy to be stored at ambient temperatures, as in the case of CAES, but without the need to depend on any specific site conditions. The CO2


ETCC concept employs CO2 as a


working fluid to produce power and store energy in combination with a gas turbine. The process is based on similar principles to those of the CO2


Battery but


with the additional feature that external heat, coming from the exhaust of the gas turbine, is introduced to the process by means of a boiler.


34| September 2021 | www.modernpowersystems.com


The project, claimed to be “a world first”, will trial “the automated management of surplus renewable electricity”, the companies say, with a smart system being used to store surplus renewable energy during peaks in production and returning it to the grid as and when needed. The project participants claim that “for the first time in the world, a storage battery site will be remote controlled using robots that collect data in real time, representing the first automatic control on a national energy grid.”


Sensors installed on the grid constantly measure power flows and algorithms are employed to to optimise storage in real time.


The Vingeanne - Jalancourt site, located in a region of high wind energy production, is equipped with a 12 MW/24MWh battery, plus power electronics and PMS (power management system) control supplied by Nidec.


Ringo


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