Eliminating PCBs from electrical equipment
We're on track to eliminate PCBs (polychlorinated biphenyls) above 50 ppm concentration from our Edmonton and Southwest Ontario electrical systems by 2025, in accordance with
Environment Canada's PCB Regulations.
By 2010, our PCB testing program had facilitated the removal of most PCB-containing assets above 50 ppm from Edmonton's system. The 1,250 assets with unknown PCB content remaining in the system will be tested, and decommissioned if needed, by 2023. In Ontario, testing in Creemore and Stayner will finish in 2021, and testing of more than 700 assets in Thornbury and Collingwood will be complete in 2022, with removal from the system taking place as required.
We're prioritizing the elimination of PCBs from its electrical infrastructure based on testing data and proximity to water bodies and environmentally sensitive areas. The operation of equipment containing PCBs less than 50 ppm concentration will continue to be diligently managed in accordance with environmental regulations and bylaws as we continue to move forward with our PCB management plans.
Optimizing fleet use to reduce fuel consumption
Our fleet management system, first implemented in our Edmonton electricity business in 2015, provides real-time data on vehicle location, driver behaviour, and vehicle diagnostics for our Electricity, Water and Drainage fleets. It allows us to continuously improve the routing of dispatched crews and vehicles, optimize vehicle maintenance and reinforce efficiency-focused driving habits.
These improvements, alongside initiatives such as our anti-idling policy, have contributed to a fuel use reduction of more than 200,000 litres per year within our Electricity fleet since 2015. Further efficiencies were achieved through the adoption of electronic fleet management within the U.S. vehicle fleet in 2017.
Protecting water quality in the North Saskatchewan River
environment section of our ESG scorecard, we report on one of the ways we protect water quality in the North Saskatchewan River. The 'total loadings' measure quantifies the annual mass of solids carried into the river as it runs off the land, and from three sources: the stormwater system, combined sewer overflows, and the wastewater treatment plant. The objective is to keep the volume of solids entering the river stable, even as our community grows.
Our approach is to consistently evaluate our performance goals and update them as our knowledge increases. A decade old, this legacy measure is currently under review between us and our regulator and due to the timing of approvals the new measure is still to be finalized. We expect future ESG reports to include updated targets that cover a wider range of discharge sources (including our water treatment plants). Future targets may also vary based on river water flow conditions, reflecting the regulator's pilot load apportionment framework and that the river's capacity to absorb solids is diminished during low-volume periods.
Sources of solids loading
The largest source of solids loading to the river (80%) occurs through stormwater system discharges. When it rains in an urban watershed, surface runoff drains through the stormwater collection system, and the water picks up particles that impact the quality of water downstream.
Historically, the volume of solids delivered to the river by the stormwater system has varied seasonally and annually based mainly on the volume and intensity of rainfall and snow melt – which is reflected in the data reported for 2017 to 2019 (2020 data is currently being finalized and will be reported on in the 2021 ESG report).
During heavy rain events or accelerated snowmelt, there are two additional sources of solids discharged to the river. At the Gold Bar Wastewater Treatment Plant, high flows are managed by diverting some partially-treated water to the river. This accounts for about 18% of reported solids loading.
Additionally, if the capacity of the combined sewer system to transport wastewater is exceeded, the system is designed to overflow to receiving water bodies in order to prevent sewer backups into buildings. In both cases, the high water flows (which is primarily rain water) also serve to dilute discharges into the river and increase overall river volume, which helps protect waterways.
Investing to protect river water quality
Edmonton's drainage utility transferred to EPCOR's ownership in September 2017, and along with it came accountability for addressing solids loading to the river from the stormwater and sewer systems.
We subsequently developed our Stormwater Integrated Resource Plan (SIRP), which includes more than $900 million in planned investments over 20-years to reduce peak stormwater flows through the use of dry ponds and Low Impact Development, both of which collect and store water during large rainfall events and accelerated snow melt. These investments build on the earlier Combined Sewer Overflow (CSO) control strategy.
These investments will reduce the risk of flooding, increase capacity in the combined sewer system, and filter stormwater before it reaches the river – improving the quality of stormwater entering the river, limiting the occurrence of CSOs, and reducing urban creek erosion.
Through increased monitoring, research, and modelling, we can quantify the sources for the loadings and then manage total loadings from our stormwater and sewage collection system.
A holistic approach to watershed protection
The management of total loadings to the river is one aspect of a much broader Integrated Watershed Management Program. The program includes each of EPCOR's water-cycle utilities in Edmonton, and is designed to consider the entire watershed's health, ensure source water protection for the Edmonton water supply, and protect urban creeks and streams from erosion and loss of aquatic habitat.