Ontario Power Generation

Oshawa Headquarters

Ontario Power Generation set out to unite its various corporate offices into a single, modern facility that embodies collaboration, efficiency, and long-term sustainability. Repurposing the former GM headquarters brought new life to an iconic site.

OPG selected Oshawa as its new corporate headquarters, purchasing and redeveloping a well-known building - the former General Motors (GM) administration building — a 285,000 ft2 facility with five levels (four storeys plus a lower concourse).

The project brought together OPG’s non-station staff from across the Greater Toronto area and Durham Region under one roof, transforming the existing structure through extensive interior and exterior renovations. Upgrades encompassed all major building systems, focusing on enhancing performance, comfort, and environmental responsibility.

HH Angus and Associates played a pivotal role as mechanical and electrical engineers, IMIT and lighting consultants, owner’s engineer, plumbing/fire protection/life safety designer, and commissioning authority.

The overarching goal was to create a future-ready workplace capable of supporting OPG’s operational and cultural needs for the next 40 years — targeting a net-zero carbon footprint and integrating leading sustainable design strategies throughout.

Meeting the objectives
HH Angus’ design solution had high sustainability and energy aspirations and involved the adaptive re-use and re-development of the GM administration building in Oshawa. HH Angus’ Commercial and Angus Connect teams came together for this project.

The project team successfully navigated a series of challenges that tested both creativity and collaboration, ultimately demonstrating their ability to deliver excellence under demanding conditions.

Materials and equipment
The unique use of materials was in fact the ‘re-use of materials’, significantly reducing deconstruction waste and embodied carbon. Much of the existing HVAC equipment was optimized (e.g., terminal heating and cooling devices) to enhance performance and capacity, rather than replacing the distribution network.

Internal resources, experience and expertise
To meet the demands of the accelerated schedule, the project team of mobilized a robust internal team, drawing on resources from across the firm. This collaborative effort, made possible by the firm’s size and depth of expertise, allowed us to maintain quality and precision while delivering on time.

Apart from strategic reuse of existing infrastructure, to accommodate increased occupancy, the design team included the use of energy recovery and thermal storage to allow system capacities to be sized below the peak demands to get the most out of the cost and embodied carbon of the equipment provided.

Outcome
Through ingenuity, collaboration, and technical excellence, the team successfully overcame these challenges—delivering a high-performance, cost-effective design that met the client’s objectives and ambitious goals, and reinforced their trust in the team’s ability to deliver innovative solutions under pressure.

PROJECT FEATURES
Size: 285,000 ft2, 5 levels (four storeys plus lower concourse) | Completed 2025

LOCATION
Oshawa, Ontario

Collaborative process

An interesting challenge was meeting the fixed project budget while delivering design integrity. To address this, the team dedicated many hours to an intensely collaborative process—partnering closely with manufacturers, vendors, and contractors to identify cost-effective solutions that preserved the client’s vision and design intent. Through innovative thinking, open communication, and strategic value engineering, the project was successfully delivered within budget while maintaining both functionality and aesthetic integrity.

Repurposing building systems

A further challenge emerged with the new interior layout, pushing existing building systems beyond their designed capacity. Rather than opting for a costly and disruptive full replacement of the distribution ductwork, the design team developed a strategic, resourceful solution. By introducing terminal heating and cooling devices to supplement the existing infrastructure, the required system performance was achieved efficiently and sustainably.

CN Tower

Lower Observation Level

The CN Tower's Lower Observation Level was completed and unveiled in January 2026, as part
of the attraction's 50th anniversary celebrations.
The refurbished area comprises 10,600 square feet, including both indoor and outdoor viewing areas, a
glass floor, stairwells, washrooms, and the SkyPod elevator lobby.

The project was designed to seamlessly extend the recently renovated Main Observation Level 3 aesthetic down to Outdoor Observation Level 2, creating a cohesive and elevated visitor experience.

This renovation marked the first major upgrade to Level 2 since the Tower opened in 1976. HH Angus provided comprehensive mechanical, electrical, lighting, and communications engineering services as part of the transformation.

Mechanical
Scope included the complete refurbishment of existing washrooms, the addition of a new fully accessible washroom, and modifications to the HVAC systems to accommodate the new slatted ceiling design and updated spatial configuration.

Electrical
Work included upgrades to electrical distribution systems and coordination of power requirements for sophisticated new audiovisual installations. LED linear lighting was integrated along the perimeter core walls, and major infrastructure upgrades were implemented to accommodate a future perimeter heated glass system.

Lighting
A new lighting design was developed throughout the space, including exterior colour-changing LED ceiling lighting at the Outdoor Observation Level. Perimeter lighting creates the Tower’s signature exterior glow, enhancing its nighttime presence. Emergency lighting systems were also upgraded as part of the project.

Communications
The project included new horizontal cabling infrastructure to support enhanced IT, AV, and security systems. Security enhancements included the deployment of new fixed and PTZ cameras to improve interior and exterior monitoring and support life safety objectives. New fibre optic cabling was installed, along with perimeter Color Kinetics lighting controls that contribute to the Tower’s distinctive exterior illumination.

SERVICES
Mechanical Engineering | Electrical Engineering | LIghting Design | Communications Design

PROJECT FEATURES
Size: 10,600 ft2 | Status: Completed January 2026 as part of the Tower's 50th Anniversary celebrations

LOCATION
Toronto, Ontario

KEY SCOPE ELEMENTS
Refurbishment of client amenities, HVAC, spatial configuration, electrical distribution system including future capacity for heated glass, new cabling infrastructure to support IT, AV, security, new lighting design throughout, perimeter lighting; exterior illumination

The visitor experience

The renovation creates a cohesive and elevated space, enhancing the new visitor activity options.

Balmoral Recreation Centre

Renovation and Expansion

The City of Brampton undertook an extensive revitalization of its existing 53-year old recreation centre.

The project involved a near-total demolition of the existing facility, with the exception of the steel structure of the pool and pool basin. The renovation and expansion have delivered an almost entirely new facility, nearly doubling the size of the former centre to 35,000 ft2. LEED Silver certification is in progress. HH Angus provided mechanical and electrical engineering, ICAT design, and lighting design services.

Key features include the rehabilitated pool, updated change rooms, a multi-sport gymnasium with an Olympic-sized FIBA court (smaller than an NBA court), a sauna, and two multi-purpose rooms that can open to create a more versatile space. The design also incorporates a large, interconnected lobby and administrative offices. Exterior improvements include additional onsite parking, as well as a new outdoor splash pad and playground.

The project replaces all air distribution systems serving the rehabilitated pool and introduces a new high-efficiency condensing boiler system to heat both the pool and the building perimeter. Heat recovery from discharged water is used to preheat incoming cold water for the pool, contributing to the achievement of multiple LEED credits. High-efficiency rooftop units equipped with heat pumps and heat recovery wheels significantly reduce overall energy consumption. Occupancy and CO₂ sensors further optimize performance by ramping mechanical systems up only when spaces are in use. Automatic curtains and daylighting strategies reduce energy demand for interior lighting, while low-flow plumbing fixtures throughout the facility help minimize water usage.

SERVICES
Mechanical Engineering | Electrical Engineering | ICAT Design | Lighting Design

PROJECT FEATURES
Renovation and expansion to create a new facility nearly doubling in size to 35,000 ft2 | LEED Silver certification in progress | Status: Completed 2025

LOCATION
Brampton, Ontario

Confidential Client

Quebec Data Centre

HH Angus provided comprehensive engineering services for the design, development, and implementation of a state-of-the-art data centre.

HH Angus was responsible for the design of the facility’s mechanical, plumbing, lighting, fire protection and building environmental control systems. This facility is split into critical and non-critical areas. The critical areas included mechanical and electrical rooms housing equipment supporting the main server spaces. The non-critical areas included administrative spaces such as meeting rooms, open offices, telecommunication service entry rooms, technical spaces housing servers supporting site operations, and a loading dock. Beyond the footprint of this building, our scope of services also extended to ancillary site structures such as the main gate guardhouse, water treatment buildings, fire pump buildings, and the deployment of private weather stations.

HH Angus implemented an evaporative cooling system to support critical IT servers. Our team designed a water treatment facility and rainwater harvesting system with a detailed metering scheme, giving the Owner visibility into water use. This made the facility water-neutral and self-sufficient year-round, eliminating reliance on municipal water for cooling.

SERVICES
Mechanical Engineering | Lighting Design | Fire Protection | Building & Environmental Systems

PROJECT FEATURES
N+1 redundant mechanical systems
to ensure continuous uptime | Completed March 2026

LOCATION
Confidential, Quebec

KEY SCOPE ELEMENTS
Feasibility study | Energy modeling | Facility design to eliminate reliance on municipal water for cooling

The Co-operators Calgary

Tenant Fitout

This project focused on a tenant renovation of two floors in The Co-operators' newly-acquired downtown Calgary office space, and comprised 40,000 square feet. The project has been certified WELL Gold.

Our approach included early coordination with the landlord to ensure handover conditions suited the client’s requirements, as well as close coordination with the construction manager in creating a pre-order due to a condensed construction schedule.

The construction schedule was a key challenge of the project along with the timing of tender. The completion date was an unmovable milestone as the client’s lease was expiring at their other location. At time of tender, product and material availability were fluctuating, which created uncertainty around delivery. To meet the deadline, our team was tasked to do everything possible to ensure the success of the project and keep the schedule on track.

To help ensure timely delivery, our team incorporated a pre-order package for the construction manager to tender, which allowed products to be reviewed and released ahead of the official tender. This effort was successful and was completed according to plan; however, some delivery delays were unavoidable, due to market conditions. To mitigate the impact, we were then tasked with contacting industry partners to help expedite deliveries. In addition, alternative temporary designs were implemented to ensure the move-in date could be met by planning the switchover date once the outstanding equipment arrived.

The Calgary office marks our fifth tenant improvement project for The Co-operators, following similar fitouts for their locations in Guelph ON and Regina SK, as well as pilot projects in Montreal QC and Burlington ON.

New Lutron lighting control design

New UPS N+1 Design and new LED Lighting Design

SERVICES
Mechanical Engineering | Electrical Engineering | Lighting Design | Communications & Security Design

PROJECT FEATURES
Size: 40,000 ft2 over two floors | Status: Completed 2023

LOCATION
Calgary, Alberta

KEY SCOPE ELEMENTS
Feasibility Study | Tenant renovation | Condensed construction schedule | WELL Gold certified