Microgrid diagram and description

The microgrid will supply a neighborhood, in whole or in part, in parallel to the main grid.
  1. 1Hydro-Québec’s distribution system supplies electricity to the Québec market. With over 225,000 km of lines, the system delivers power that’s more than 99% clean and renewable to 4.4 million customers.
  2. 2The breaker is a device that disconnects the microgrid from the main grid. When it is open, the connection is disrupted and the microgrid operates autonomously.
  3. 3Solar panels capture the sun’s rays and convert them into electrical energy. The sun is a source of intermittent renewable energy.
  4. 4The energy storage system stores electricity, including the electricity produced by solar panels, in batteries. Combining an intermittent renewable like solar power with a storage system makes it possible to meet energy needs for a certain period when demand exceeds supply.
  5. 5Electric vehicles (EVs) are powered by electric batteries. Unlike vehicles that run on gas, vehicles that are 100% electric emit zero GHGs.
  6. 6Charging stations recharge electric vehicle batteries. The Electric Circuit, Quebec’s largest EV public charging network, has both quick-charge (400 V) and standard (240 V) stations.
  7. 7Smart buildings are designed to optimize resource use and improve energy efficiency without compromising on comfort.
  8. 8The control system monitors and manages all the components of the microgrid. It provides data on the electricity generated by the solar panels and the battery charge level as well as forecasting future supply and demand. It also oversees the connections between generation, storage and end user, based on mode of operation and certain pre-set rules.

Solar power


Rooftop, Centre sportif Mégantic

Solar panel farm installed on the roof of the sports center

The roof of the sports complex will be covered with 1,700 solar panels totalling 620 kW of installed capacity — over 75% of the electricity produced by the microgrid.

These panels will supply the microgrid when it operates in islanded mode (i.e. when the connection with the Hydro-Quebec grid is interrupted). Surplus power will be stored in batteries at the microgrid substation or fed back into the main grid when in connected mode (i.e. once the connection has been restored).

Microgrid pavilion

A multipurpose covered structure powered by solar energy will be installed in the downtown core, where it will serve to showcase the project. The structure’s two-sided solar panels will power the nearby heritage railway station, thus reducing the station’s electricity bill. In building the structure, project partners set out not only to exemplify the harmonious integration of new technologies into the urban landscape, but also make them accessible and understandable to everyone.

A model for integrating technology with the environment.

A public gathering place sheltered from the weather that offers many possible uses, including:

  • Public market
  • Concerts
  • Temporary events
  • Day care center activities
  • Recreational activities (yoga, Zumba, etc.)

Solar power generation and energy consumption

Evolution of photovoltaic solar power and energy consumption (loads) on a yearly basis

In summer, solar generation can exceed energy demand. In winter, it is lower.

In winter (side sections of the graph), given the reduced number of hours of sunlight and the higher demand due to heating, solar energy will only partially power the microgrid buildings.

In summer (central part of the graph), the solar energy produced will be sufficient to meet the demand from all the buildings served by the microgrid.

Should supply exceed demand, the surplus will be stored in batteries and used during cloudy periods or after sundown. The microgrid’s two-way energy exchange feature means surplus power could also be reinjected into Hydro-Québec’s main grid.


The microgrid’s capacity for autonomy in islanded mode will vary based on season, weather conditions and time of day. On average, more hours of autonomy are to be expected in summer and less in winter.

The microgrid can operate in islanded mode up to 60% of the time in the summer. However, islanding is not possible in the winter.

The microgrid can operate in islanded mode up to 60% of the time in the summer. However, islanding is not possible in the winter.

Energy storage

The energy storage system will optimize the microgrid’s energy ecosystem by providing the required power at the right time.

Some possible applications:

  • Additional power supplied during peak periods
  • Storage for intermittent renewables like solar power
  • Keeping buildings powered when the main grid goes down

Energy management

Smart devices

Home automation devices: smart plugs and light bulbs, dimmers, smart switches and thermostats

Thermostats, light bulbs and other smart devices will be installed in the co-properties to help their occupants more effectively manage energy use.

Optimizing energy use through new technologies and changing habits are part of an energy-saving mindset that anyone can adopt.

Electric vehicle charging stations

A two-vehicle EV charging station will be installed near the heritage railway station to promote the progressive phasing out of fossil fuels in favor of renewables.

Energy efficiency measures

Upgrades and improvements to mechanical HVAC systems in commercial buildings on Promenade Papineau will improve the work environment and overall comfort, while energy management adapted to actual usage will result in energy savings.

Control system

The control system will manage the microgrid’s every component.

Microgrid substation

Below, an overview of the components of a microgrid substation.

Substation including: storage system, transformers, converter and control building
  1. 1Containerized energy storage system
    • A total of 600 kWh of power in two containers
    • Lithium-ion batteries (LFP technology developed by Hydro-Québec researchers)
  2. 2Transformers (500-kVA and 1500-kVA)

    Voltage adjustments:

    • Raising the output voltage of the solar panels (sports complex roof) to 600 V
    • Lowering the output voltage of the temporary generator (located in front of the station during the test period) to 600 V
  3. 3A 750-kVA converter (rectifier/inverter)

    Current transformer:

    • Transformation of alternating current into direct current (rectifier) to store energy in the batteries
    • Transformation of direct current into alternating current (inverter) to inject power from the batteries into the main grid
  4. 4Control building
    • Control systems
    • Electricity distribution panels
    • Telecommunications
  5. 52,500-kVA transformer

    Voltage adjustments:

    • Raising substation output voltage to 25,000 V
    • Lowering distribution system voltage to 600 V

Examples of use

Watch these short videos to learn about energy flows based on different uses (in French only):

Video: Normal state (daytime)

Durée : 32 seconds

Video: Normal state (evening)

Durée : 25 seconds

Video: Planned islanding (daytime)

Durée : 50 seconds

Video: Planned islanding (evening)

Durée : 23 seconds

Video: Outage (daytime)

Durée : 48 seconds

Video: Outage (evening)

Durée : 26 seconds