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Town of Midland: WWTC DES Combined Heat & Power System

Municipality

Situated at the southern end of Georgian Bay's 30,000 Islands, Midland is the economic centre of the region, with a 125-bed hospital and a local airport (Midland/Huronia Airport). It has a year-round population of 17,000, but during the summer months, the area's population grows to over 100,000, hosting seasonal visitors to more than 8,000 cottages, resort hotels, provincial and national parks in the surrounding municipalities.

Project Name and Description

The 2013 Energy Plan endorsed by the Town of Midland Council identified a goal of 1% energy savings per year. To meet that goal, multiple projects have been investigated, including the feasibility of a Co-generation System at Midland's Wastewater Treatment Centre (WWTC). Cogeneration or combined heat and power (CHP) is the use of a heat engine or power station to generate electricity and useful heat at the same time. At the Midland Wastewater Treatment Centre, the system has a Digester installed, which although is not yet operational, could be used ‘digest’ the Primary and Secondary materials that were removed (called sludge) through treatment. The sludge in Digester’s is kept at 95.5 degrees Fahrenheit and anaerobic bacteria break down the sludge. After the sludge is thoroughly digested, it is then called biosolids. As a result of digestion, gases such as methane and carbon dioxide are also produced in the Digester, and the methane gas (or biogas) would then be captured and used to produce electricity in a process called cogeneration. This energy could be used to help heat the digester and power the wastewater treatment plant. Cornerstone Energy's Advisor worked with the Town to connect staff with R.H. Shergold & Associates, after discussions with other firms, to complete a Detailed Engineering Study (DES). The Town was awarded SAVE-ON-ENERGY Study funding of $48,000, after the consultant was able to demonstrate the positive potential for a Co-generation System. This funding was used to undertake the DES, with a focus on demonstrating the viability of a Combined Heat and Power (CHP) or Cogen Plant to meet the electrical and heating requirements of the WWTC.

The DES consists of:

(1) Systems Energy Use Measurement,

(2) System Energy Use Analysis,

(3) Detailed Financial Analysis, and a

(4) Complete Savings Map.

Project Contact (Staff)

Jamie Galloway, P.Eng.,LEED AP

Town Engineer

P: 506.526.4275 x.2267

E: jgalloway@midland.ca | engineering@midland.ca

Date of Study Completion

April, 2016

List of Project Partners

(i.e., other municipalities, businesses, organizations or community groups)

  • Midland Power Utility Corporation (MPUC)
  • Cornerstone Hydro Electric Concepts, Inc. (CHEC)
  • H.R. Shergold and Associates
  • Efficiency Engineering.com
  • Water and Wastewater Operations Staff, Town of Midland
  • Engineering Staff, Town of Midland

List of Key Stakeholders

Municipal staff and Council, community members (long-term savings potential and reduced operating expenses, reduction in energy use and GHG emissions)

Drivers/Champion

What was your municipalities’ main reason for moving this project forward? Who was the biggest champion for the project?)

Implementation of a Combined Heat and Power System at the Wastewater Treatment Centre would have many benefits, environmental and economic, including:

  • Off-set of electrical use,
  • Off-set of natural gas by natural gas fired heating systems,
  • Reduced maintenance costs on HVAC systems,
  • Reduction/elimination of flaring of digester gas, and
  • Electricity production from waste digester gas.

A study was completed to determine the feasibility of the project and detail options, project constraints, risks and benefits.

Financial Considerations

What was the cost of the project? How was the project funded? Internally or externally? If externally, where was the support acquired (i.e., grant program, community donations, multiple methods)?

The Town was awarded SAVE-ON-ENERGY Study funding of $48,000, after the consultant was able to demonstrate the positive potential for a Co-generation System. This funding was used to undertake the DES, with a focus on demonstrating the viability of a Combined Heat and Power (CHP) or Cogen Plant to meet the electrical and heating requirements of the WWTC.

Measures of Success/Impacts

How would the project help your municipality or department achieve its sustainability goals? What specific metrics can you share about the impact it would have?

  • Current Annual Consumption of the WWTC System: 2028 MWh/year
  • Projected Annual Reduction in Electricity Use of the WWTC System: 1206 MWh/year (up to 60% reduction)
  • Annual Projected Reduction of GHG Emissions 832 Metric Tonnes/year**
  • Proposed Capital Cost (Including Design): $504,353
  • Estimated Electricity Bill Savings [$143,500/year]*
  • Internal Rate of Return (with Incentives): 18.1 years

*These calculations use the Option of a 2 x 25kW Genset Model DG Yanmar CP25WE-TF.*Based on a potential reduction of 1025 MWh/year with an assumed electricity rate of $140/MWh). **Based on an average carbon production per fuel by MWh. Please note that these estimates are approximate and should not be used for emission inventory or formal carbon foot-printing exercises.

Municipal Contact Information

The Town of Midland

575 Dominion Avenue

Midland, ON L4R 1R2

705.526.4275

www.midland.ca

Documents

Waste Water Treatment Centre Detailed Engineering Study: Combined Heat and Power System

Staff Report, Engineering Department, May 19, 2015

Town of Midland, Conservation Demand Management Plan, 2014-2019

Type of Case Study

Type of Case Study

☐Education and Outreach

☐Policy Adjustment or Development

☒Partnerships & Collaboration

☐Enforcements & Incentives

☐Implementation of Programs & Services

☒Facilities & Infrastructure Improvements

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575 Dominion Avenue
Midland, Ontario, L4R 1R2