Marriott International

Marriott International, Inc. is a leading hospitality company with more than 3,800 properties in 73 countries with 19 hotel brands.

Reducing costs and carbon for Marriott International

Founded by J. Willard and Alice Marriott and guided by Marriott family leadership for more than 80 years, the company is headquartered in Bethesda, Maryland, USA, and reported revenues of nearly $12 billion in fiscal year 2012.

The challenge

Marriott's sustainability strategy supports business growth and reaches beyond the doors of their hotels to preserve and protect the planet's natural resources. Marriott's environmental goals include an initiative to further reduce energy consumption and were the first major hotel chain to calculate their carbon footprint and launch a plan to improve energy efficiency, conserve water and support projects that reduce deforestation.

The solution

As part of its energy efficiency policy, Marriott has installed and run Veolia (Cogenco) CHPs at its UK sites for over 15 years. The installation of new CHP replacement units across 14 of its 58 UK properties in cooperation with Veolia will bring Marriott a step closer to achieving its 2020 goal of further reducing energy consumption by 20% per kWh/conditioned m2 enterprise-wide, a target set by the group's Global Green Council.

With the hotel's existing CHP fleet nearing the end of its operational life and engine technology advancing over the past decade, Marriott International had its units upgraded by Veolia's packaged CHP team (Cogenco).

Each of the 14 retrofitted hotels benefit from its own co-generation plant that produces electricity and heat from a single fuel source to cover energy demands. To match the locations' base electrical and thermal loadings the plants are individually sized, ranging from 121kWe to 400kWe. Veolia project managers ensure that any downtime is kept to an absolute minimum between the removal of the existing unit and the commissioning of the new unit on each site. This CHP update will take the total Veolia CHP capacity across sites to 4.22MWe. Veolia has been Marriott's long-term CHP partner since 1999.

The CHPs produce electricity and simultaneously recover the heat that is given off as a by-product during the electrical generation process. This thermal energy is retained within the system where it is used to heat water. Thus each onsite plant is able to cover base load electricity demand and domestic hot water usage, including the utilisation of leisure facilities at the respective hotel. Particularly, in hotels with high occupancy rates the application of state-of-the-art CHP can achieve a significant reduction of utility costs and carbon emissions.

The onsite nature of a CHP plant means that energy is not wasted through grid-transmission either. Instead it is generated and fed directly to where it is needed, resulting increased efficiency when compared to the losses in transmission over large distances.

Veolia offers a full design package, assembly, pre-commissioning, installation, commissioning and remote monitoring, covered by a comprehensive maintenance and service package to suit customer requirements. Veolia units range from 35kWe to 2.2MWe, and operate on a variety of fuels, including natural gas, biogas, biomass, diesel, bio-diesel and landfill gas. Veolia now has over 550 units in operation worldwide.

The results

The CHP units help to reduce energy costs and save 6,713 tonnes of CO2 each year in line with Marriott's environmental policy. Marriott International benefit from the CHP design, installation and operation expertise from Veolia's teams who support the hotel applications on a 24/7 basis. This ensures that the guest environments receive secure low carbon heating and electricity and that the hotels gain improved Energy Performance Certificate ratings.


 “ Our energy plants directly impact the environment that our business operates in. To preserve its health, it is vital to embrace those technologies that help to reduce our carbon footprint and the new CHPs will do just that. In collaboration with Veolia, we are already planning the replacement of further CHP engines over the next two years ”

John Conlon 
Head of Engineering, Facilities and Capex Planning Europe at Marriott International