Energy Saving Systems


Generating power with natural gas and putting waste heat to work. Generating power with natural gas and putting waste heat to work.

  • Energy saving systems

Roppongi Hills

At Roppongi Hills, we have adopted a large-scale district energy system (Cogeneration + DHC). A huge natural gas-fueled co-generation plant recovers the waste heat from a central electrical power generation system and uses it to meet the heating and cooling needs of the community.


Saving energy with a high-efficiency system Saving energy with a high-efficiency system

  • Saving energy with a high-efficiency system Saving energy with a high-efficiency system

By generating power with gas and putting waste heat to work, the highly efficient system provides approximately 20% primary energy savings, which in turn reduces CO2 and NOx emissions.


Efficient district-wide energy utilization

  • Efficient district-wide energy utilization

ARK Hills

Though one of the earliest major development undertaken by Mori Building, the ARK Hills project featured the introduction of a district heating and cooling (DHC) system. A sub-plant is located in the Akasaka Intercity project, which was developed in the neighboring district, promoting the establishment of an Area Energy Network and further energy conservation.


Eco-friendly Thermal Storage System

  • Eco-friendly Thermal Storage System
  • Thermal storage HVAC system concept
  • (Peak HVAC Load Day,
  • Example of the heat pump operation program)

This system averages the electrical power load over the day by the nighttime storage of the energy used for daytime HVAC operation. This redistribu- tion of the power load reduces the burden on the environment by shifting electrical power consumption to nighttime hours when the usage of fossil fuel for power generation is lower and contributes to reduced load on the power generation plant.

Specifications of Mori Building Properties with Thermal Storage Systems
Atago Green Hills Mori Tower 86,570m2 of office & retail space 800 RT absorption type (400RT x 2)
600 RT brine turbo (ice manufacture phase)
720 RT brine turbo (demand fulfillment phase)1,000 RT absorption type (400RT x 2, 200RT x1)
840m3of ice
(dynamic)
1,720 RT capacity of the thermal storage tower (including demand fulfillment) 860 RT x 2
2,520 RT
Holland Hills Mori Tower 2235,656m2 of office, residential &retail space 700 RT steam generator (350RT x 2)
200 RT brine turboMori Tower
610m3of chilled water thermal storage tank(thermal stratification tank) 300 RT capacity of the thermal storage tower Heat exchanger 300 RT
1,200 RT
Akasaka Tameike Tower 47,758m2 of office, residential &retail space 420 RT steam generator (210RT x 2)
200 RT Double-hand turbo
700m3of chilled water thermal storage tank
(thermal stratification tank)
400 RT capacity of the thermal storage tower Heat exchanger 400 RT
820 RT
Mori TowerPrudential Tower 76,585m2 of office, residential &retail space 1,000 RT absorption type (400RT x 2, 200RT x1)
400 RT brine turbo (ice manufacture phase)
600 RT brine turbo (demand fulfillment phase)200 RT Double-hand turbo
355m3of ice
(dynamic)
1,100 RT capacity of the thermal storage tower (including demand fulfillment) Rel. heat from heat exch. 250RT×2
Rel. heat from heat exch. (demand fulfillment phase) 600 RT
2,100 RT

Our commitment to the total elimination of wasted energy

  • Our commitment to the total elimination of wasted energy
  • 1. Regular assessment of energy consumption
  • 2. Identification of potential faults
  • 3. Confirmation and optimization of automated management

With its BEMS (Building Environment and Energy Management System), Mori Building has a comprehensive grasp of building energy utilization and the state of the interior climate and the knowledge necessary to optimize energy conserva- tion. The centralized monitoring system allows managers to confirm the state of energy utilization in real time. By accumu- lating and analyzing data, we can identify and eliminate excessive energy usage and waste. Under national government policy to promote the adoption of BEMS, the New Energy Development Organization (an incorporated administrative agency) known as NEDO has system of subsidies to encourage installation of energy efficient systems. Currently three Mori Building properties are beneficiaries of this subsidy program: Roppongi Hills Mori Tower, Holland Hills Mori Tower and Toranomon 37 Mori Building.

BEMS-equipped Properties

As a result of BEMS optimized management of cutting-edge energy-saving systems, Roppongi Hills Mori Tower and Holland Hills Mori Tower recorded actual annual energy consumption in 2007 signifi- cantly less than initial projections: -23% and -16.7%, respectively. Exploiting the strength of Mori Building’s integrated approach to development projects from the planning stage to operational management, BEMS Operation Promotion Councils have been organized in buildings equipped with BEMS. Working as one, our Planning Division, Management Division and various companies that support building management and maintenance endeavor to conserve energy and reduce CO2 emissions.

BEMS-equipped Properties
Name Existing/New Scale/Gross floor space Management system check points
Roppongi Hills Mori Tower newly constructed 54 floors above ground,6 underground levels approx. 380,000m2
approx. 4,000 pts
Holland Hills Mori Tower newly constructed 24 floors above ground,2 underground levels approx. 35,7002

approx. 4,000 pts
ARK Mori Building existing 37 floors above ground,4 underground levels approx. 182,000m2

approx. 4,000 pts
Omotesando Hills newly constructed 6 floors above ground,6 underground levels approx. 34、000m2
approx. 2,000 pts
Toranomon37Mori Building existing 13 floors above ground,2 underground levels approx. 36、700m2 approx. 800 pts

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