Environment

Climate Change

Item				FY2023	FY2024	FY2025	Unit
GHG (Scope 1 and Scope 2) - Equity share^{1, 2}
Direct GHG emissions (Scope 1)^{3, 4} ✓				6,864	6,833	6,385	thousand tons-CO₂e
Indirect GHG emissions (Scope 2)^{3, 4} ✓				56	45	43	thousand tons-CO₂e
Net carbon intensity⁵				28	28	27	kg-CO₂e/boe
GHG (Scope 1 and Scope 2) -Operational control^{2, 6}
Direct GHG emissions (Scope 1)⁴	Emissions source	Japan ✓	Energy use	160	147	91	thousand tons-CO₂e
			Flaring	4	8	4
			Other ventings and fugitives	17	19	13
			Raw-CO₂ venting	83	64	58
		Overseas ✓	Energy use	3,178	3,243	3,087
			Flaring	318	395	288
			Other ventings and fugitives	139	112	80
			Raw-CO₂ venting	2,722	2,626	2,501
	Gas types⁷	Japan ✓	CO₂	245	219	152
			CH₄	19	19	13
			N₂O	0	0	0
		Overseas ✓	CO₂	6,192	6,235	5,852
			CH₄	160	136	99
			N₂O	5	5	5
		Total		6,622	6,614	6,121
Indirect GHG emissions (Scope 2)⁴	Location-based	Japan ✓		36	32	36
		Overseas ✓		1	1	1
		Total		36	33	38
	Market-based	Japan ✓		34	35	34
		Overseas ✓		1	1	1
		Total		35	36	35
GHG (Scope 3)⁷
Indirect GHG Emissions (Scope 3)²	Category 1	Purchased goods and services⁸		1,973	2,725	2,170	thousand tons-CO₂e
Indirect GHG Emissions (Scope 3)²	Category 11	Use of sold products⁸ ✓		86,199	86,238	87,135	thousand tons-CO₂e
Methane emissions intensity - Operational control⁶				0.05	0.05	0.04	%
Reduction contributions - Equity share¹				n/c	n/c	1,109	thousand tons-CO₂e
Energy consumption - Operational control⁶
Energy consumption⁹		Japan ✓	Fuels (oil, natural gas, etc.)	3,096	2,874	1,773	TJ
		Japan ✓	Purchased electricity and heating	754	672	700
		Overseas	Fuels (oil, natural gas, etc.)	61,552	62,878	48,041
		Overseas	Purchased electricity and heating	6	8	9
		Total		65,408	66,430	50,522

*

Items for which data is not collected are marked with n/c (not collected).
1

The total amount of emissions corresponds to the net economic share of each production project
2

Scope 1: Direct emissions from sources we owned or controlled.
Scope 2: Indirect emissions from the consumption of electricity, steam, heat, and cooling we purchased
Scope 3: All indirect emissions that occur in our value chain
Scope 1 and Scope 2 emissions include all emissions from the consolidated accounting group. Non-consolidated companies are primarily engaged in solar and wind power generation, and therefore have no Scope 1 or Scope 2 emissions.
3

Of the equity share emissions in FY2025, we have obtained third-party assurance for Scope 1 emissions (4,204 thousand tons) and Scope 2 emissions (35 thousand tons) from the production projects where we take the operator role as of December 31, 2025, and from our head office and Technical Research Center.
4

The emissions are calculated in accordance with local laws and regulations and rules for HSE-related data.
5

Net carbon intensity includes offset. Intensity indicates the volume of GHG emitted per unit of consolidated production of oil and natural gas (converted to calorific values) in Japan and overseas.
6

HSE data are reported on an operational control basis including head office, Technical Research Center, overseas offices, and operational organizations in Japan and overseas.
7

The emissions of the seven gases specified in the Kyoto Protocol were reviewed; based on materiality, actual emissions of CO₂, CH₄, and N₂O are disclosed.
8

Category 1: The volume of contractor emissions and upstream emissions from the production of purchased goods.
Category 11: The emissions are calculated by multiplying the total sales volume of crude oil, natural gas, and LPG both domestically and internationally by CO₂/CH₄/N₂O emission factor under the assumption that all amounts of crude oil, natural gas, and LPG are combusted. The emissions are calculated from 2006 IPCC Guidelines for National Greenhouse Gas Inventories emissions factors.
9

The data are calculated in accordance with local laws and regulations (including the Act on Rationalization of Energy Use and Shift to Non-fossil Energy in Japan).

Other environmental data

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Item					FY2023	FY2024	FY2025	Unit
Water management - Operational control¹
Freshwater consumption		Japan ✓	Tap water		144,619	119,919	115,437	m³
			Water for industrial use		123,415	123,431	125,660
			Groundwater and surface water		806,317	772,324	563,886
			Total		1,074,351	1,015,674	804,983
		Overseas	Tap water		551,260	573,975	567,892
			Water for industrial use		0	0	0
			Groundwater and surface water		0	0	0
			Total		551,260	573,975	567,892
		Total			1,625,610	1,589,650	1,372,875
Discharge of produced water		Japan ✓	Discharged into public water areas		98,532	88,687	80,267	m³
			Injection return to groundwater		233,422	282,667	266,122
			Total		331,954	371,354	346,389
		Overseas	Discharged into public water areas		487,435	474,237	458,666
			Injection return to groundwater		0	0	0
			Total		487,435	474,237	458,666
		Total			819,389	845,591	805,054
Waste management - Operational control¹
Waste^{2, 3}		Japan⁴✓	Non-hazardous waste (waste diverted from disposal)	Preparations for reuse	0	0	0	tons
				Recycling	962	1,015	1,019
				Others	0	328	120
				Total	962	1,343	1,140
			Non-hazardous waste (waste directed to disposal)	Incineration (with energy recovery)	105	32	39
				Incineration (without energy recovery)	136	85	86
				Landfill	193	129	101
				Others	180	0	0
				Total	613	247	226
			Hazardous waste (waste diverted from disposal)	Preparations for reuse	0	0	0
				Recycling	0	0	0
				Others	15	769	1,072
				Total	15	769	1,072
			Hazardous waste (waste directed to disposal)	Incineration (with energy recovery)	22	0	26
				Incineration (without energy recovery)	95	18	71
				Landfill	0	0	0
				Others	782	0	0
				Total	899	18	97
			Total		2,490	2,376	2,534
		Overseas	Non-hazardous waste (waste diverted from disposal)	Preparations for reuse	2,850	3,167	765
				Recycling	385	547	2,380
				Others	1,639	3,994	9,143
				Total	4,875	7,708	12,288
			Non-hazardous waste (waste directed to disposal)	Incineration (with energy recovery)	76	3	2
				Incineration (without energy recovery)	0	0	0
				Landfill	1,312	1,636	1,727
				Others	0	0	0
				Total	1,389	1,639	1,729
			Hazardous waste (waste diverted from disposal)	Preparations for reuse	0	1	0
				Recycling	47	91	229
				Others	0	200	1,345
				Total	47	292	1,574
			Hazardous waste (waste directed to disposal)	Incineration (with energy recovery)	605	23	0
				Incineration (without energy recovery)	0	0	29
				Landfill	86	76	218
				Others	0	0	41
				Total	691	99	288
			Total		7,001	9,738	15,879
		Total			9,491	12,115	18,413
Waste (drilling-related work)^3,5		Japan⁴ ✓	Waste diverted from disposal		10,920	14,523	1,944	tons
			Waste directed to disposal		16,121	487	170
			Cuttings		n/c	8,089(0)	824(0)
			Total		27,041	23,099	2,939
		Overseas	Waste diverted from disposal		2,400	2,778	85
			Waste directed to disposal		1,981	722	31
			Cuttings		n/c	2,076(0)	0(0)
			Total		4,382	5,575	117
		Total			31,422	28,675	3,055
Other environmental management - Operational control¹
Emissions to atmosphere	VOC⁶	Japan ✓			490	413	370	tons
		Overseas ✓			2,161	2,610	3,349
		Total			2,651	3,023	3,719
	NOx	Japan ✓			187	133	80
		Overseas ✓			3,269	3,247	3,655
		Total			3,456	3,380	3,735
	SOx	Japan ✓			4	4	4
		Overseas ✓			89	649	302
		Total			94	653	305
Oil spills	Number of spills				0	0	0	cases
Oil spills	Quantity of spills ✓				0	0	0	bbl

*

Items for which data is not collected are marked with n/c (not collected).
1

HSE data are reported on an operational control basis including head office, Technical Research Center, overseas offices, and operational organizations in Japan and overseas.
2

Complying with the reporting standards of GRI306.
3

The definition of hazardous waste is in accordance with local laws and regulations. Within Japan, "specially controlled industrial waste" as stipulated in the Act on Waste Management and Public Cleaning is set as "hazardous waste," and other waste (including "industrial waste" and "municipal waste") is set as "non-hazardous waste."
4

Among municipal waste, all waste is counted as landfill since the amount of waste classified as non-flammable is not known by treatment category.
5

The amount of waste generated from drilling-related work such as cuttings has been counted individually. From FY2024 onward, the waste from drilling-related work is categorized and counted separately as cuttings and non-cuttings. The figures in parentheses indicate the amount of cuttings that were landfilled.
6

Japan: VOC emissions are calculated using the PRTR Release and Transfer Calculation Manual for Oil Refineries and Oil Storage Depots, etc. published by the Petroleum Association of Japan.
Overseas: The emissions are calculated in accordance with local laws and regulations. The emissions data for 2023 and 2024 are currently being verified, including prior-year data, as of the publication date of this report. The figures will be updated upon completion of the verification process.

Renewable Energy

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Boundary	Item		FY2023	FY2024	FY2025	Unit
Consolidated	Electricity generated by using renewable energy	Geothermal	668,425	661,957	642,527	MWh
		Wind	836,832	1,260,009	1,436,904
		Solar	37,318	160,734	344,444
		Total	1,542,575	2,082,700	2,423,875
	Total investment in renewable energy		77,435	5,707	23,391	million yen

Environmental Conservation-related CAPEX and OPEX

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Item	FY2023		FY2024		FY2025		Unit
Item	CAPEX	OPEX	CAPEX	OPEX	CAPEX	OPEX	Unit
Environmental conservation-related CAPEX and OPEX - Operational control¹
Global warming prevention (including energy saving)	412,680	832,122	547,249	758,108	724,525	1,163,063	thousand yen
Prevention of air pollution	48,755	7,841	72,017	8,403	189,837	50,270
Conservation of soil and groundwater environment	38,830	0	182,295	0	217,562	0
Conservation of water quality	0	316,673	0	1,312,939	120	179,503
Treatment and disposal of waste	22,849	591,494	131,664	748,499	95,277	586,649
Project management	345,690	220,885	102,833	310,604	54,921	334,618
Monitoring of environmental impacts / conservation of soil and groundwater environment (onshore)	179	6,860	37,725	27,714	25,500	88,189
Monitoring of environmental impacts / conservation of water quality (onshore)	179	6,860	37,725	27,714	25,500	88,189
Monitoring of environmental impacts / conservation of water quality (offshore)	2,485	72,293	2,963	93,728	2,466	23,881
Monitoring of environmental impacts / project management (offshore)	2,485	72,293	2,963	93,728	2,466	23,881
Monitoring of environmental impacts / biodiversity conservation	22,344	287,526	25,014	297,805	25,280	311,867
Total	893,812	2,335,693	1,101,760	3,557,802	1,335,487	2,738,039
Grand total	3,229,505		4,659,562		4,073,526

1

HSE data are reported on an operational control basis including head office, Technical Research Center, overseas offices, and operational organizations in Japan and overseas.

Climate Change

Other environmental data

Renewable Energy

Environmental Conservation-related CAPEX and OPEX

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Sustainability