Reduction of Environmental Impact

Management Approach

The TEPCO Group conserves the local environment by conducting management based on the following four approaches : (1) recognition and evaluation of environmental impact (environmental assessments), (2) management of polluting substances, (3) reduction of polluting substance emissions volume, and (4) risk management. A summary of detailed initiatives is as follows.

Environmental assessment

When conducting development projects, from the planning phase, we conduct environmental impact assessments as mandated by law to reduce environmental impact as much as possible.

Air pollution and water contamination prevention

We take continuous measurements and conduct sampling to monitor emissions released into the air and public water area from TEPCO power plant facilities and confirm that emissions are compliant with mandated environmental standards. To reduce emissions of polluting substances, we implement countermeasures concerning fuel, facilities, and operations management.

Waste management

The TEPCO group promotes waste management, including management of PCB waste products, to reduce the environmental impact accompany with by our business activities. The Federation of Electric Power Companies has established the goal of striving for an approximately 95% recycling rate for waste by FY2020. The TEPCO Group is contributing to this initiative by promoting the recycling of industrial waste products. For PCB waste, we conduct appropriate storage and management in accordance with relevant laws. We transferred control of operations related to the cleaning, treatment, and recycling of low-level contaminated PCB equipment to our wholly-owned subsidiary Tokyo Power Technology Inc. to promote planned detoxification and treatment.

Chemical substance management

Through our environmental management system, we ascertain emissions volumes, consumption volumes, and retention volumes for PCB (polychlorinated biphenyl) waste, toxic substances subject to the PRTR Act, ozone depleting substances, and asbestos. Substances subject to management are managed appropriately in accordance with applicable laws and we work towards emissions reduction by promoting switching to products not containing applicable substances.

Risk management

We conduct risk management for soil and water pollution due to toxic substance leaks by regularly inspecting storage tanks, installing breakwaters and leak-off barriers, and preparing neutralizing agents, to prevent pollution damage. We also maintain records of products in use that contain polluting substances to ensure appropriate treatment during disposal and replacement. To address radioactive pollution incidental to the Fukushima Daiichi Nuclear Power Plant, in addition to cooperating with the government to conduct cleansing and prevent contamination to groundwater that flows below the grounds of the power plant, we also are implementing various measures to prevent polluted water from flowing into the ocean.


Water withdrawals / discharges by sources

Total water volume used for power plants (industrial water and river water) and tap water volume use are as follows.

*River water used for hydroelectric power stations excludes water used for pumped-storage hydroelectric power stations.

2016 Remarks
●Water withdrawals (m3)
- Industrial water, etc.
9.93 million
Tap water used of the above industrial water
1 million Actual amount in 2015: 1.06 million m3
- River water (hydroelectric power stations)
51 billion*
●Water drainage volume (m3)
- Drainage volume
4.97 million
- River water (hydroelectric power stations)
51 billion

Water sources significantly affected by withdrawal of water

Hydroelectric power stations use 51 billion m3 of river water (excludes pumped-storage hydroelectric power) from rivers for power generation, including Katashina river whose water source is the Oze Wetlands (1.81km2), a part of the wetlands registered under the Ramsar Convention. However, there are no facilities that draw water directly from the lake or marshes, and the power generation process does not accompany water consumption. Thermal power plants and other facilities use 9.93 million m3 of industrial water, etc. However, Japan's water withdrawals for municipal water supply from lakes and marshes is only 1.4%, with 3/4 of total water used being taken from dams and rivers. As such, no water sources are thought to be significantly affected by use of industrial water, etc.

Water bodies and ecosystems affected by water discharges and/or runoff

Wastewater from power plants, etc. is treated appropriately at TEPCO treatment plants in accordance with relevant laws. We also confirm that the water has no environmental impact prior to draining. Contaminated water produced at the Fukushima No. 1 Nuclear Power Plant is being treated appropriately and stored in tanks in the facility area. As there is no flow or drainage to external sources, there are no water basins or related ecosystems impacted by wastewater from power plants, etc.
Furthermore, at certain hydropower plants, water used is flowed into a separate water system but hydropower plant operations are managed in accordance with the Guidelines for River Water Level Maintenance, and the impact of water use by power plants on river basins is limited.

Emissions of ozone depleting substance (ODS)

Ozone depleting substance (ODS) production, imports, and exports volumes

The TEPCO Group does not produce, import, or export ozone depleting substances (ODS).

FY2015 FY2016
Production / imort / export volume (t) 0 0
  • *

    Emission intensity used for calculations: N/A

  • *

    Standards, methods, prerequisites, calculation tools used: N/A

Other atmospheric emissions (SOx/NOx)

To reduce sulfur oxides (SOx) and nitrogen oxides (NOx) emitted from TEPCO Fuel & Power thermal power plants, we have implement several countermeasures and thus achieved a very low emissions levels globally.

FY2015 FY2016
SOx(g/kWh) 0.05 0.05 -
NOx(g/kWh) 0.11 0.10 △9%

Materials used by volume

The TEPCO Group's main product is electricity, and fuel for power generation is a raw material. Respective consumption volumes are as follows.

FY2016 fuel consumption volumes

Fuel type Consumption volume
Coal (1,000t) 8,137
Heavy & crude oil (1,000 kL) 2,134
Gas (LNG, city gas, etc.) (1,000t) 23,565
Fuel for nuclear power generation (t) No operation

Waste by type and disposal method

We promote industrial waste recycling to reduce environment impact accompanying with our business activities as much as possible.

Industrial waste recycling and landfill treatment volumes

FY2015 FY2016
Recycling rate (%) 99.4 99.5 0.1 (%)
Amount of Landfill disposal (1,000t) 7.8 5.2 -33 (%)

Breakdown of main industrial waste recycling

Waste product name Volume (1,000t/year*1) Main recycling applications
Coal ash 785.7 Cement raw materials, materials for landfill
Desulfurized gypsum 180.9 Construction materials, cement raw materials
Decommissioned concrete pillars 77.6 Road materials
Metal dust 52.5 Metallic materials, recycled power cables
PCB, etc. 19.2 Insulation oil: Heat recovery after detoxification
Transformer unit: Recycled for steel and copper materials after washing
Wastewater treatment sludge*2 8.7 Road materials, raw materials for cement
Heavy, crude oil ash 0.7 Metal recovery, raw materials for cement
Shells 3.3 Materials for road construction
Other 12.3 -
Total 1,140.8*3
  • *1:

    Volume = Volumes for materials with value + materials reused internally + industrial waste (handling for radioactive waste is defined under nuclear power laws and thus is not included in the waste volumes for industrial waste).

  • *2:

    Mass after dehydration.

  • *3:

    Total figure and breakdown sum do not match due to rounding of figures.

Significant spills

FY2015 FY2016
No. of spills 0 0

The number of significant spills is zero. In the event of a significant spill accident, we respond promptly and appropriately in accordance with relevant laws and regulations.

Transport of hazardous waste

  • Japan is a signatory of the Stockholm Convention and the Minamata Convention. We manage PCBs and mercury-contaminated waste appropriately and in accordance with relevant laws based on these conventions. We also work to ascertain the status of use of asbestos and conduct management in accordance with relevant laws and regulations.
  • There was no importing or exporting of hazardous waste.
  • PCBs and asbestos are transported for processing.

Treatment of hazardous waste

Volume of PCB waste treated (FY2016)

Treatment Products No. Treated
No. of pole transformers (Unit: 10000) 7.0
Insulating oil inadvertently containing PCB (Unit: 1000 kL) 4.2
No. of high-voltage transformers and condensers (high contamination) (Unit: 1) 797.0

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