Creating a city aware of the need for saving energy and protecting the environment

Full consideration is given to the environment and saving energy at Roppongi Hills, and every effort is made to bring more greenery back to the center of the city and to build energy-saving power supply systems.

Planting vegetation

Approximately 29% of site are green, and Roppongi Hills is covered.
Roppongi Hills Mori Tower and the residence buildings and other facilities have been built vertically and very high. This is an effective way to create more open space for parks, plazas, and walking paths. In addition, positive efforts have been made to plant vegetation on the rooftops of the buildings.
We are connected for prevention of warming (heat island effect) of city by planting trees, and, in the Roppongi Hills, surface temperature lowers 10 degrees Celsius - 15 degrees Celsius in comparison with the outskirts.

Photo: Sky map

Keyakizaka Complex Rooftop Garden

A rooftop garden (1,300 m2 in area) that has been designed with the theme of a traditional Japanese farm has been created on the roof of the Keyakizaka Complex (Toho Cinemas Roppongi Hills). Viewing the rooftop garden where rice, vegetables and other plants are cultivated and animals are raised, visitors to the complex can gain a feeling for the food culture of Japan along with other aspects of traditional Japanese culture. In this way, visitors are also encouraged to think about the environment and how food is produced. (normal secrecy), in Roppongi Hills, work on roof Planting vegetation positively, and consider environment such as heat island effect relaxation of city, reduction of air conditioning load in midsummer.

Large-scale cogeneration

Using city gas, we perform generation by gas turbine and use exhaust heat to be generated at the time of generation, and Roppongi Hills supplies air-conditioning in district. This results in a 20% reduction in primary energy consumption, a 27% reduction in CO2 emissions, and a 45% reduction in nitrogen oxide (NOx) emissions.
Furthermore, as backup at the time of emergencies such as at the time of disasters, 72-hour generation is possible in addition to supplement power supply from electric power company by generating electricity by kerosene.

Reusing water (gray water system and rainwater utilization system)

Wastewater of relatively good quality, including the water drained from restroom sinks, baths, and air conditioner drains in each Roppongi Hills building (excluding the residences) is recovered and sent through a treatment process to bring it to a quality level where it can be reused. It is then supplied to each building as gray water for such purposes as flushing toilets. This reduces demand for clean water (tap water) by approximately 30%.

As for the Roppongi Hills, rainwater outflow restrains rainwater by 14 places of rainwater retention tanks, road rainwater penetration facilities, penetration facility in site in district. Rainwater which accumulated realizes saving water of approximately 28% by using as the filtration treated back, make-water of cooling tower of district heating and cooling facility.

Solar power generation

As part of its effort to contribute to mitigating global warming, Roppongi Hills has installed a solar power system that generates 10 kilowatts of energy. The electricity generated is used for the lighting in the museum cone. Lithium ion storage batteries are linked to this to provide a reserve power source that can be used during power outages.
A video showing the Roppongi Hills vision of using solar power systems to generate electricity is combined with a real-time indication of the amount of power being generated.

(Technical cooperation) Panasonic Corporation Eco Solutions Company

Sorting trash for collection and recovery

Trash generated at every building in Roppongi Hills is sorted before collection to enable efficient and environmentally friendly disposal and recovery.
We classify wastepaper according to each processing purpose and reproduction use and it dissolves and is handled and recycles 100%.