DOWNTOWN CALGARY TRANSMISSION REINFORCEMENT PROJECT …

PROJECT OVERVIEWThe demand for power is increasing as Calgary continues to grow. The Alberta Electric System Operator (AESO) has determined that the existing transmission system in downtown Calgary can become overloaded under certain conditions. Overloaded transmission lines reduce the reliability of your power supply and increase the likelihood of interruptions in power supplied to homes and businesses. The AESO has therefore identified the need for transmission reinforcement into the downtown area.

On November 18, 2015, the AESO filed its Needs Identification Document (NID) for Transmission System Reinforcement in Downtown Calgary with the Alberta Utilities Commission (AUC). On June 1, 2016, the AUC approved the AESO’s NID.

To meet this need ENMAX Power Corporation (ENMAX) is proposing to build a new 138 kV transmission line between ENMAX No. 2 Substation located at

3120 – 9 Street SE, and ENMAX No. 8 Substation located at 903 – 4 Avenue SW.

DOWNTOWN CALGARY TRANSMISSION REINFORCEMENT PROJECT (DCTRP)PROPOSED TRANSMISSION LINE

Photo courtesy of The City Calgary

PROPOSED SCHEDULEENMAX plans to file the Facility Application with the AUC by the end of September 2017. Subject to approvals being granted, construction to begin by mid-2018 with a proposed in-service date of early 2021.


Proposed Project Schedule

2017 2018 2019 2020

Ongoing stakeholder relations September 2017 – 2021

Early 2021 – In-service date

September 2017 – ENMAX Powersubmits FA to the AUC

Initial stakeholder engagementMay 2017 – August 2017

Mid 2018 – Construction begins

2021

TRANSMISSION POLES

The proposed single circuit transmission poles for the overhead portion will be self-supporting steel monopoles. All poles except one will range in height from approximately 18 to 28 metres (59 to 92 feet) and will be 50 to 160 metres (165 to 524 feet) apart. One pole located near No.2 Substation will be approximately 32 metres in height.


Proposed Steel Transmission PoleProposed Steel Deadend Pole Proposed Steel Riser Pole

DOWNTOWN CALGARY TRANSMISSION REINFORCEMENT PROJECT (DCTRP)PROPOSED TRANSMISSION OVERHEAD LINE RENDERING

All Pole locations and distances shown are approximate and may change based on final structure design.

DOWNTOWN CALGARY TRANSMISSION REINFORCEMENT PROJECT (DCTRP)PROPOSED TRANSMISSION LINE RENDERINGS

UNDERGROUND TRENCH CONSTRUCTION ACTIVITIES


UNDERGROUND TRENCH CONSTRUCTION ACTIVITIES

Manhole placement and set up


CABLE PULLING CONSTRUCTION ACTIVITIES


UNDERGROUND DRILL CONSTRUCTION ACTIVITIES

DOWNTOWN CALGARY TRANSMISSION (DCTRP)PROPOSED TRANSMISSION LINE

UNDERSTANDING ELECTRIC AND MAGNETIC FIELDS

• Electric and magnetic fields (EMFs) are found everywhere electricity is used from household wiring to power lines. ENMAX understands public concerns with EMF and in order to provide current information to the public and our employees, we continue to monitor the issue through our work with the Canadian Electricity Association’s EMF task group.

• While there are no EMF limits related to long term health effects, some countries and organizations (such as the World Health Organization) have adopted the 2010 ICNIRP guideline of 2000 mG (milligauss) for acute effects.

• For further information, please visit: https://www.enmax.com/Safety/electrical-safety/electric-and-magnetic-fields-(emf)


ELECTRICITY 101

GENERATION

Where it all startsElectricity sometimes travels long distances from generation plants to your homes, schools, hospitals and businesses. Canada’s entire electricity grid is crisscrossed with power lines that move the electricity to you.

When electricity comes out of the generation plant it usually has a voltage of about 20,000 volts. A volt is the measurement of how much electric force is pushing electrons around a circuit.

At the generation plant, the electricity is boosted up to 245,000 volts by a transformer. This higher voltage helps the electricity travel more efficiently long distances.

TRANSMISSION

Cross-country journey The electricity then goes into long thick cables called transmission lines. The wires are made of copper and aluminum because these metals let electricity flow through them easily. You can tell you are looking at transmission lines when you see high towers – often made of steel - with many wires attached to them going across the countryside.

When the electricity on the transmission lines gets close to where it will be used it goes into a substation. The substation contains electrical equipment such as transformers. The transformers lower the voltage of the electricity to match where it will be used. Factories, mass transit systems, streetlights, businesses and homes all need the electricity to be at a different voltage

DISTRIBUTION

Moving from the substation to your community Electricity leaves the substation on smaller wires called distribution lines to take it to homes and businesses. In some communities, distribution lines are overhead and you can see them. Newer neighborhoods have the distribution lines underground so you may not even know they are there.

YOUR NEIGHBORHOOD

It arrivesWhen the distribution wires reach your neighborhood, another small transformer, mounted on a pole or in a utility box, lowers the voltage of the electricity even more so it can be used in your house. The voltage is eventually reduced to 220 volts for larger appliances, like stoves and clothes dryers, and 120 volts for lights, televisions and other smaller appliances.

When electricity enters your home, it must pass through a meter. A member of the ENMAX Power Corporation team reads the meter so we’ll know how much electricity you used and can provide you with an accurate bill.

After being metered, the electricity goes through a fuse box into your home. The fuse box protects the house in case of problems. When a fuse or a circuit breaker ‘blows’ or ‘trips’, something went wrong with an appliance or something short-circuited.

THE ENVIRONMENT

The majority of the proposed project’s route is underground in City streets, and therefore would have minimal impact on the natural environment.

The proposed overhead transmission line would cross the Elbow River on the east side of the 1st St Bridge, minimizing the amount of tree trimming and removal. Transmission poles would be located at the top of the banks and outside of the natural areas. Appropriate erosion and sediment control measures would be installed prior to construction, to prevent soil and sediment from entering the water.

A few trees along the route would have to be removed to accommodate construction, and all the removed trees would either be replaced or compensated for. ENMAX has consulted with and received approval from Urban Forestry for the tree removal.

Flight diverters would be installed on the shield wire of the transmission line where it crosses the river. This would help ensure the wire is visible to birds in low light conditions and prevent collisions. ENMAX also consulted with the Urban Conservation department, and the Alberta Environment and Parks wildlife biologist.

ENMAX is committed to providing environmentally responsible energy solutions to the communities we service, and we strive to continually improve our environmental performance.


Flight Diverter

Photo courtesy of The City Calgary


We hope we’ve answered your questions and have your comments.

Please take a moment to provide us with your comments. Your input will be included in our engagement report which will be incorporated into our application to the Alberta Utilities Commission.

ENMAX POWER CORPORATIONPhone: (403) 514-1471E-mail: [email protected]: enmax.com/dctrp

THANK YOU FOR ATTENDING OUR OPEN HOUSE

COMMITMENT TO COMMUNITY

ENMAX is committed to being a responsible corporate neighbour in the community. This commitment includes providing timely and meaningful engagement with stakeholders about this project.

We have developed a comprehensive public involvement program to provide opportunities for area residents, occupants and landowners to be informed about this proposal and to engage with ENMAX in dialogue from the planning phase through to construction.

Documents

DOWNTOWN CALGARY TRANSMISSION REINFORCEMENT PROJECT …