For inquiries regarding water supply, please contact the Water Works Bureau Customer Service Center.
Water Works Bureau Customer Service Center
Telephone: 045-847-6262 Fax: 045-848-4281
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Renewable energy
Last Updated March 1, 2024
About 98% of total greenhouse gas emissions in Yokohama city area is carbon dioxide (CO2).
Since CO2 emissions are largely due to the energy consumption of petroleum-based fuels, electricity, and city gas, it is important to reduce energy consumption and increase the proportion of renewable energy that does not rely on fossil fuels.
Water Works Bureau uses many pumps to supply tap water, which consumes a lot of electricity.
For this reason, we are actively introducing solar power generation and small hydroelectric power generation to build an environmentally friendly water supply system.
※Renewable energy
Among non-fossil energy sources, it is recognized that they can be used permanently as energy sources. Unlike fossil fuels, it is characterized by constant regeneration and supply of energy sources and less burden on the global environment. Specifically, solar, hydro, and wind are mentioned.
Photovoltaic power generation facilities
The solar energy (light) is generated by receiving solar power panels.
In Water Works Bureau, solar panels are installed on the roof of the government building and on the following facilities.
- Filteration pond: movable arch lids to prevent foreign substances from entering and reduce chlorine consumption.
- Sediment Pond: Light shielding plate to prevent the occurrence of algae
Filtration pond cover type solar power generation equipment
Float shading equipment equipped with a sinking pond solar cell
| Name of the facility | Power generation capacity (kilowatts) | Operating year |
|---|---|---|
| Kosuzume Purifiction Plant | 1,041 | Fiscal 2000-FY27 |
| Kikuna Water Plaza | 3 | 2007 |
| Kawai Purification Plant (Cerarocca) | 336 | 2014 |
| Nakamura Water Plaza | 10 | 2014 |
| Total | 1,390 |
Small hydroelectric power generation facilities
The water wheel is turned using the power of the water flowing through the water pipe, and the generator connected to the water wheel is rotated to generate electricity.
Image: Kawai Purification Plant Small Hydroelectric Power Generation
Image: Horizontal axis cylinder propeller water wheel
| Name of the facility | Power generation capacity (kilowatts) | Operating year |
|---|---|---|
| Kohoku Reservoir (*) | 300 | 2006 |
| Kawai Purification Plant | 270 | 2010 |
| Aoyama Water Source Office | 49 | 2011 |
| Mine Reservoir | 25 | 2015 |
| Onda Reservoir | 35 | 2016 |
| Imai Reservoir | 49 | 2016 |
| Total | 728 |
※Since the small hydroelectric power generation facilities at the Kohoku Reservoir are installed by a privately owned private system, some of the power generation effects are owned by the installer, Tokyo Electric Power Co., Ltd. For details, please refer to the Kohoku Reservoir Small Hydroelectric Power Project page.
Inquiries to this page
Water Works Bureau Water Purification Department
Telephone: 045-671-3544
Telephone: 045-671-3544
Fax: 045-212-1158
Email address: su-josui@city.yokohama.lg.jp
Page ID: 581-039-963
