A detailed Energy Audit at the JW Marriott – The Rosseau Resort & Spa was performed to identify where and how the Resort could save energy and overhead costs. With the implementation of Energy Management Opportunities (EMOs) it was estimated that the Resort would save approximately $550,000/year and have the average simple payback of 2.99 years.


The Energy Audit consisted of detailed current and historic data collection on the building and energy consuming Equipment/Systems. Utility data, occupancy, building structure, equipment design specifications, operation schedules and visual evaluations were all included in the scope of the Project. The work followed ASHRAE Level II Guidelines.


The Resort, consisting of two buildings house 221 Guest Rooms, meeting rooms, ballrooms, bars, spas, two restaurants and pools. The Facility occupancy varies month to month with the summer months showing near full occupancy rate.

A majority of the energy consuming Equipment/Systems operate all year round. The Heating and Cooling Systems’ and laundry appliances’ schedule is dependent on seasonal loads. The outdoor pool is open in summer only.

Utility findings showed the following cost breakdown:

Electricity 55%; Propane 32%; Water 17%

The highest energy consumer is the Heating System. The current System is powered by 3 propane Boilers and represents approximately 30% of the yearly energy bill and contributes to 1995 tonnes of CO2. This represents 63% of total annual CO2 emissions. Given the location of the Facility, Natural Gas is not available as an energy source. Biomass is an alternative Heating System which can satisfy the demand whilst reducing the overall energy cost. The BioBox System has a rated efficiency of 93%, is a carbon neutral source and will reduce the propane generated 1995 CO2 tonnes/year.

Electrical Heating Units were noted to keep the Water and Sewage Plant space warm in cold weather. To reduce energy and increase efficiency Heat Pumps which can provide heating and cooling were recommended which would save 37,000 kWh with a simple payback of 2.8 years.

The Audit identified that the Chillers operate outside the Manufacturer’s specifications and consume excess energy to provide cooling to the Facility. A comprehensive recommissioning using a System Performance Analyzer would provide a clear picture of current operation and achieve significant energy savings through performance optimization of the System. This EMO will save an estimated 90,200 kWh and $14,430/year of electricity cost. Incentive Funding is also available.

Results showing Low Temperature Differential across the Cooling Tower is likely caused by dirty coils from biological film build up. This reduces Heat Exchanger performance and the total Cooling Tower capacity. Probiotic BioScrub cleaning of the Tower will maximize heat transfer and decrease overall annual energy consumption by an estimated 35,800 kWh.

The 23 Air Handling Units for the Resort operate based on room temperature Setpoint which uses a fixed ventilation strategy. Current thermostats are temperature based with motion detector sensors. Installing a Demand Control Ventilation with webenabled thermostats, window and door sensors and upgrading the Building Automation System will properly control and monitor ventilation and temperature based on actual occupancy and create energy savings.


Implementing EMOs will save approximately $550,000/year in electricity and propane, increase occupant comfort and reduce carbon emissions.