On the occasion of the construction of its new headquarters in Vannes, the Energy Union of the Morbihan Department (SDEM) has decided, with the support of Schneider Electric, to conduct an experimental project: designing an energy-producing building serving the electricity grid, capable both of going off the grid, particularly in peak periods, and of sending back to the grid the renewable energy produced by the building or drawn by it from the grid and stored in its battery system.
Detailed Solution description
Brittany is a special region in terms of energy in that it produces barely 10% of the energy it consumes and is supplied only from its eastern side. In order to avoid black-outs, especially during peak periods, and to strengthen the public distribution grid, the region operates under the Breton Electric Pact, which calls for controlling the demand for electricity, deploying renewable energy on a large scale and securing the electricity supply.
The Morbihan Department’s Energy Union (SDEM) owns 22,000 km of low and medium voltage electricity grids operated by ERDF and 14,000 distribution stations.
In the spirit of the “Breton Electric Pact,” SDEM plans to help develop energy self-sufficiency in Brittany. In this context, and on the occasion of the construction of its new headquarters in Vannes, SDEM has decided to conduct an experimental project – designing an energy-producing building, capable both of going off the grid, particularly in peak periods, and of returning to the grid the renewable energy produced by the building or drawn by it from the grid and stored in its battery system.
Electricity is produced by 850 m2 of 126 kWp photovoltaic panels on the roof and by two small wind turbines (2.5 kWp each). Storage system: Lithium-ion battery, 56 kWh capacity (with an additional capacity of as much as 100 kW).
At the heart of the experiment is the Power Management System (PMS) solution developed by Schneider Electric.
The PMS combines inverters, automated systems and a monitor as well as the StruxureWare Energy Operation platform, which measures and tracks energy consumption. The PMS also manages energy flows between the distribution grid, local energy production (photovoltaic or wind), storage in batteries, recharging of electric vehicles and of course building consumption.
This is also the system that triggers mechanisms for self-consumption, storage or the resale of electricity.
- Building floor space: 3,300 m² (Ground floor + 1)
- Capacity in terms of number of employees: 100 persons
- Construction: Labelled “Passiv Haus”, wood/concrete framework – Reinforced exterior insulation – triple-glazed windows
Launch DateImplementation began on
Syndicat Départemental Energies du Morbihan [Morbihan Department Energy Union], Schneider Electric
Key figures illustrating Solution deployment and results
ROI expected from this unsubsidised project less than eight years.
Kergrid is a genuine opportunity for experimentation to explore new applications around the active management of energy and especially to take steps to optimise energy usage and the resale of energy on the grid.
It makes it easier to analyse the technical and economic relevance of using electricity on the building’s grid in order to:
- Model an electric system combining production, consumption and storage
- Develop and use a real time decision-making tool for operational scenarios
- Demonstrate the value of the technological contribution of active management systems
- Offer a decision-making tool for project owners
- Identify the technical and legal constraints related to exchanging energy on the scale of a microgrid
- Evaluate the economic importance of the solutions proposed, taking into account issues related to land management and the operation of public grids
- Propose a change in the regulatory framework to promote the deployment of those solutions.
Performance, impact and results
Possibility of going off the electricity grid and operating autonomously (two hours) during peak periods.
Storage of the renewable energy produced by photovoltaic/wind installations and resale at the right time by injection into the grid
Test of the technical and economic relevance of the experimental solutions
Press ContactJean-Pierre Gherardi