NIHONKAIGAS KIZUNA

What NIHONKAIGAS KIZUNA does

NIHONKAIGAS KIZUNA HOLDINGS (日本海ガス絆ホールディングス) is a private holding company headquartered in Toyama City, Japan, that consolidates 14 operating subsidiaries providing regional energy and adjacent infrastructure services across the Hokuriku region (Toyama, Ishikawa, and Fukui prefectures). The group's foundational business is city gas and LP gas supply to a base of 101,067 residential households, with FY2024 city gas throughput of 129,206 thousand cubic meters and LP gas volume of 42,273 tonnes. Beyond commodity supply, the group has built a multi-utility and services portfolio that includes electricity retail, electrical and communications construction (via the 2024 acquisition of Hokuriku Densetsu), housing (TOSUMO Architecture Design, established 2023), lifestyle services (TOSUMO Lifestyle, established 2022), and decarbonization consulting (Next Plus, established 2023-04), which collectively drove the non-gas revenue ratio to 68.8% in FY2024.

The technology and product portfolio centers on distributed energy infrastructure rather than software platforms. Recent product additions include Soraene Smart (launched 2025-10), a bundled offering combining PPA solar third-party ownership with ENE FARM residential fuel cells; carbon-neutral city gas; J-Credit Management / Green & Smile Club for carbon credit intermediation (launched 2024-03); and AAKEL eFleet, a genetic-algorithm-based EV charging optimization system developed by subsidiary Arcel. Internal AI tooling includes AI OCR plus RPA for document processing and generative AI for internal knowledge search, while gas demand forecasting leverages weather and historical consumption data. The company holds ISO 14001 environmental certification, BELS 5-star certification for its Sapura HQ, ZEB Planner registration for Next Plus, and a Baby-First Declaration issued in 2024.

The business model combines regulated utility annuity revenue from residential gas supply with project-based and construction revenue from the non-gas segment. FY2024 consolidated revenue was ¥33.07 billion with operating profit of ¥885 million, on a group headcount of 680. Customer concentration is broadly distributed: residential households form a long tail, while enterprise customers span healthcare, hospitality (APA Hotel), retail (Aeon Mall Toyama), manufacturing, and municipal government, with no single anchor account disclosed. Under the 2025 mid-term plan, management targets ¥40 billion in consolidated revenue by FY2027 and a non-gas revenue ratio above 50% by 2030, executed through a combination of organic product expansion, M&A, and corporate venture activity including the 2026-06-30 investment in the Toyama Co-Accel CVC fund. The Nitta founding family retains leadership positions across the group.

Name

NIHONKAIGAS KIZUNA

Legal name

日本海ガス絆ホールディングス株式会社

Website

https://hd.ngas.co.jp

Company type

Private

Founded year

2018

Operating status

Operating

Headcount range

251–500 employees

Short description

NIHONKAIGAS KIZUNA HOLDINGS is a private Toyama-based holding company of 14 subsidiaries supplying city gas and LP gas to 101,067 Hokuriku households, with expanding operations in renewable energy, electrical construction, housing, and decarbonization consulting.

Ownership category

akta.pro rank

Product category

Regional Energy Utility Services

NAICS

Electric Power Generation, Transmission and Distribution (2211), Steam and Air-Conditioning Supply (221330), Management of Companies and Enterprises (55111)

SIC

Cogeneration Services & Small Power Producers (4991)

akta.pro primary industry

Renewable Energy Asset Management (Solar/Wind/Hydro/Geothermal) (EUAEAMAB)

akta.pro secondary industries

Energy & Renewables Specialty Contracting (Solar PV, Storage, EV Charging) (IMAFALAJ), Warranty, Service Contracts & OEM Relationship Management (Claims, SLAs, Performance Guarantees) (EUAMAGAO), Electrical Systems O&M (Substations, Transformers, Switchgear, Protection & Controls) (EUAMAGAH)

Keywords

• City gas supply
• LP gas distribution
• Energy infrastructure
• Decarbonization consulting
• Building equipment construction

Headquarters

HQ city

Toyama

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Supply Chain, Personnel, Operations, Infrastructure, Technology or R&D, Marketing or Sales

Revenue model

1. City Gas and LP Gas Sales: Core revenue from manufacturing, supplying and selling LNG-based city gas and LP gas to residential, commercial and industrial customers. Gas sales volume: approximately 129,206 thousand cubic meters of city gas and 42,273 tonnes of LP gas annually (2024). Customer base of approximately 101,067 households (city gas + LP gas combined).
2. Construction and Infrastructure Services: Revenue from subsidiary companies (Sapra, G-Tech, Hokuriku Densetsu) providing building equipment, pipeline construction, waterworks, civil engineering and mechanical instrumentation construction services. Also includes maintenance services for air conditioning and building equipment.
3. Real Estate: Rental income from owned apartments (2 buildings), condominiums (5 units), retail stores and commercial land. Properties equipped with comprehensive gas appliances for tenant comfort.
4. Restaurant and Food Business: Revenue from TOSUMO Lifestyle subsidiary operating Hoshino Coffee shops and Kobe Cook World Buffet, plus food subscription service delivering bread and meal kits.
5. Energy Equipment Sales and Maintenance: Sales and maintenance of air conditioning equipment (absorption chilling units, GHP, EHP, boilers), Enefarm units, and related building equipment through subsidiary Sapura and others.
6. New Housing Sales: Revenue from TOSUMO Architecture Design subsidiary selling new custom homes (jigsaw brand) and providing renovation/reformation services.
7. Leasing Services: Lease revenue from computers, multifunction devices, industry-specific equipment, and automotive leasing with maintenance services through subsidiaries.
8. Insurance Agency: Insurance agency revenue from handling property, casualty, life insurance for individual customers and liability/construction insurance for corporate clients.
9. Decarbonization Consulting: Revenue from NexPlus subsidiary providing CO2 measurement, decarbonization consulting, equipment construction, energy services, and subsidy application support for corporate customers seeking carbon neutrality.
10. CVC / Investment Returns: Returns from corporate venture capital activities by Nihonkai Lab, investing in startups and VC funds (Toyama Co-Accel and others) as part of open innovation strategy.

Pricing tiers

Go-to-market motion2 records

Distribution channels6 records

Marketing channels16 records

Core offering

NIHONKAIGAS KIZUNA HOLDINGS is the holding company of a 14-subsidiary comprehensive regional energy group headquartered in Toyama City, operating primarily in the Hokuriku region of Japan (Toyama, Ishikawa, Fukui prefectures). The group's core offering is the manufacturing, distribution, and supply of city gas (LNG-based) and LP gas to approximately 101,067 residential and commercial/industrial customers, complemented by energy-efficient equipment (ENE FARM household fuel cells, cogeneration systems, GHP air conditioning), solar PPA services, infrastructure construction, and decarbonization consulting. The group also provides adjacent lifestyle services including architecture, real estate, restaurants, insurance, and leasing.

Product overview

NIHONKAIGAS KIZUNA (日本海ガス絆ホールディングス) is a comprehensive regional energy group headquartered in Toyama City, operating primarily in the Hokuriku region (Toyama/Ishikawa/Fukui prefectures). The group's core portfolio centers on city gas and LP gas (liquefied petroleum gas) supply and distribution (handled by Nihonkai Gas and subsidiaries Mott Nihonkai Gas and Telsaways), complemented by energy-efficient equipment including ENE FARM household fuel cells, cogeneration systems, GHP (gas heat pump) air conditioning, and hybrid HVAC systems. The portfolio spans renewable energy services (solar PPA under the So-Ra Farm and Soraene Smart brands), carbon-neutral gas products, EV smart charging, and energy management systems (EMS). Supporting the energy business are subsidiaries covering infrastructure construction (Sapla, G-Tech, Hokuriku Densetsu), building equipment maintenance, real estate, architecture and renovation (TOSUMO Architecture Design, TOSUMO Lifestyle), insurance, and leasing. An innovation layer — Nihonkai Lab — operates the HATCH incubation facility, the NGAS-Accelerator Program, and CVC investment activities, while Next Plus handles decarbonization consulting. The group also operates Showroom Prego as a customer engagement and education hub. The architecture is a holding company (Kizuna HD) over 14 subsidiaries, unified under the NEXT Vision 2030 strategy to shift from gas-only to a 50% non-gas revenue mix.

Differentiator

Problem solved

Functional benefit

Brands

• Prego（プレゴ）: 日本海ガス公式ショールーム的品牌、ガス機器展示・料理教室・情報発信を実施
• Prego Club
• Prego Kids Club
• So-Raファーム
• ソラエネスマート
• jigsaw
• Green&Smile Club
• HATCH（ハッチ）
• NGAS-Accelerator Program

Products and services

• City Gas Supply (都市ガス) Manufacturing and supply of LNG-based city gas to residential, commercial, and industrial customers across Toyama Prefecture and the broader Hokuriku region. Covers approximately 1,506 km² supply area with approximately 129,206 thousand cubic meters annual volume (FY2024).
• LP Gas Supply (液化石油ガス) LPG supply, delivery, and filling services for residential and commercial customers, managed through subsidiary Telsaways with centralized 24-hour remote monitoring systems detecting gas leaks and pressure abnormalities in real time. Annual volume approximately 42,273 tonnes (FY2024).
• ENE FARM Household Fuel Cell (エネファーム) Household fuel cell cogeneration system that generates electricity and hot water simultaneously from hydrogen extracted from city gas or LPG, achieving approximately 80% total energy efficiency with backup power capability during outages. Cumulative sales exceeded 1,724 units as of December 2025.
• Solar Photovoltaic PPA Model (太陽光PPAモデル) Third-party ownership solar PV model where NIHONKAIGAS KIZUNA owns and maintains solar equipment on customer sites, selling power to customers at reduced rates with zero upfront cost. By 2025, 13 installations across Toyama Prefecture with 4.0MW total panel capacity and cumulative CO2 reduction of 3,199 tonnes.
• Carbon-Neutral LP Gas (カーボンニュートラルLPガス) Carbon-neutral LP gas product with CO2 emissions from extraction through combustion offset via carbon credits from ENEOS Globe, certified by a US-based international NGO. First such supply in the Hokuriku region. Achieves net-zero CO2 from well to combustion.
• EV Smart Charging Service (EVスマート充電サービス) Demonstration service using genetic algorithm-based charging management system (AAKEL eFleet) that controls multiple EV brands and charger types simultaneously, optimizing for electricity market prices, state of charge, and next-day operation schedules to enable peak shifting and renewable energy utilization.
• J-Credit Management / Green & Smile Club Program enabling ENE FARM customers to convert J-Certified CO2 reduction credits into Prego Club loyalty points as rewards. Credits are also used for company CSR carbon offset activities.
• Soraene Smart (ソラエネスマート) Combined PPA solar and ENE FARM type S service launched October 2025 enabling double power generation at zero initial cost for both solar panels and fuel cell unit. Targets GX-oriented and ZEH homes with the goal of achieving zero primary energy consumption and outage resilience.
• Cogeneration Systems (コージェネレーションシステム) Gas engine and gas turbine cogeneration systems delivering both electricity and usable heat at approximately 80% total efficiency. Installed at hospitals, hotels, commercial facilities, and public institutions for energy resilience and CO2 reduction. Deployed across approximately 23+ facilities.
• GHP (Gas Heat Pump) Air Conditioning Systems Gas engine-driven heat pump air conditioning system providing both cooling and heating with waste heat recovery, achieving energy savings and electric demand peak reduction. Multiple blackout-compatible models available for disaster resilience.
• Infrastructure Construction (インフラ整備事業) Design and construction of gas pipelines (polyethylene pipe), water/sewer systems, electrical systems, HVAC, and mechanical/instrumentation equipment, plus maintenance services, seismic pipe replacement, and emergency repair. Operated by subsidiaries Sapura, G-Tech, and Hokuriku Densetsu.
• Decarbonization Consulting / Next Plus (ネクストプラス) Decarbonization consulting subsidiary offering CO2 measurement, reduction roadmap development, energy audits, subsidy application support, and energy service contracting for corporate customers. Registered as ZEB Planner in July 2024.
• Architecture / TOSUMO Architecture Design (jigsaw brand homes) Architecture subsidiary offering new custom construction under the jigsaw brand (ultra-high-performance design homes), renovation and reform services, and operating model houses in Toyama Prefecture.
• Insurance Agency Services Insurance agency offering personal insurance (auto, fire, life) to residential customers and commercial insurance (liability, contractor insurance) to business clients.
• Leasing Services Equipment leasing services for computers, office equipment, industrial machinery, and vehicles with optional maintenance packages, including gas equipment leases integrated with residential and commercial properties.
• HATCH Business Incubation Facility (HATCH) Business incubation facility operated by Nihonkai Lab offering co-working space, startup support programs, and collaboration with regional universities. Base for the NGAS-Accelerator Program and CVC investment activities.
• NGAS-Accelerator Program Open innovation acceleration program co-operated with 01Booster that selects startups for 4-5 month business co-creation sprints with group employees and municipal partners, culminating in Demo Day presentations. Themes include well-being, decarbonization, energy savings, and real estate.

Quantifiable outcome

• CO2 emissions reduction of 3,199 tonnes achieved through PPA solar model cumulative (2020-2025)
• +8 more outcomes

Named customers28 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability3 records

Feature8 records

Partnerships

Nine partnerships are on record, tiered minor and core.

• Imizu City (射水市)minorStrategic or Co-development Partner · 29 June 2026Japan Sea Gas Co., Ltd. signed a mutual cooperation agreement with Imizu City for disaster response. Agreement covers emergency gas supply equipment restoration and priority gas supply to designated evacuation facilities during major disasters. Aims to strengthen disaster response coordination between the city and the company.
• 01Booster (株式会社ゼロワンブースター)coreStrategic or Co-development Partner · 1 January 202501Booster co-operates the NGAS-Accelerator Program with NIHONKAIGAS KIZUNA and Nihonkai Lab. The program selects startups for business co-creation with group employees over 4-5 months, culminating in Demo Day presentations. 6 startups selected in 2025 program covering themes of wellbeing, decarbonization, energy conservation, and real estate utilization. 5 startups in 2024 program covering IoT monitoring, wave power generation, and biotechnology.
• Toyama Thunderbirds (富山サンダーバーズ)minorGTM or Marketing Partner · 1 January 2024Sports team sponsorship as part of regional contribution and community activation. Also participant in 'Hokuriku wo Kiyo ni! (Let's Energize Hokuriku!)' disaster recovery support project for Noto Peninsula earthquake, including beach cleanup and furniture removal activities.
• Japanese Red Cross Toyama/Ishikawa Branches (日本赤十字社 富山県支部/石川県支部)minorOthers · 1 January 2024Japan Sea Gas Kizuna Holdings donated 5 million yen each to Toyama and Ishikawa branches of the Japanese Red Cross following the 2024 Noto Peninsula Earthquake, for rescue and early recovery support for affected areas.
• Toyama City Carbon Offset Operation Council (富山市カーボン・オフセット運営協議会)coreStrategic or Co-development Partner · 1 August 2023Three-party agreement between Toyama City, INPEX, and Japan Sea Gas for forest conservation activities in Toyama City. Council creates forest-derived carbon credits that are used by INPEX to offset carbon neutral gas supplied to Japan Sea Gas. Japan's first supply of forest-derived locally produced and consumed carbon offset gas to a private company.
• Arcel Technologies (アークエルテクノロジーズ株式会社)minorStrategic or Co-development Partner · 1 January 2023Joint demonstration project for EV smart charging service using Japan Sea Gas company EVs. Arcel's genetic algorithm-based EV charging management system (AAKEL eFleet) enables remote automated charging across multiple EV brands and charger types. Features include peak shift and peak cut functions for economic and efficient EV charging.
• ENEOS Globe Corporation (ENEOSグローブ株式会社)coreStrategic or Co-development Partner · 1 January 2022First in Hokuriku region — ENEOS Globe supplies carbon neutral LP gas to Japan Sea Gas. CO2 emissions from extraction through combustion are offset via carbon credits certified by a US-based international NGO. Japan Sea Gas switched its own facilities to carbon neutral LP gas, contributing approximately 334 tonnes annual CO2 reduction, and began commercial/industrial customer sales.
• Hokuriku Bank (株式会社北陸銀行)coreStrategic or Co-development Partner · 1 January 2021Hokuriku Bank served as underwriter for SDG-linked donation private placement bond. First customer for 'Forest Power' carbon neutral city gas supply from Japan Sea Gas (December 2023). All 11 city gas contract stores receiving carbon neutral gas, achieving approximately 390 tonnes annual CO2 reduction (equivalent to CO2 absorption of approximately 27,000 cedar trees).
• Toyama City (富山市)coreStrategic or Co-development Partner · 1 January 2020Comprehensive SDG partnership agreement with Toyama City covering regional industry promotion, decarbonization, distributed energy infrastructure deployment to public facilities, and sustainable regional development initiatives.

Scale indicators24 records

Recent moves6 records

Expansion highlights3 records

Broad incumbents

• Tokyo Gas: Japan's largest city gas utility with nationwide energy services, renewable power, and LNG trading. Provides the incumbent benchmark for product breadth, decarbonization roadmap, and capital scale against which regional operators like Nihonkai Gas are measured.
• ENEOS Holdings: Japan's largest energy company and a strategic partner to Nihonkai Gas via ENEOS Globe for carbon-neutral LP gas supply. Comparable in energy distribution scale and decarbonization product portfolio.
• Osaka Gas: Major Japanese gas utility with diversified energy, real estate, and international businesses. Comparable for energy services diversification strategy and carbon-neutral product offerings, though far larger in scale.

Emerging players

• 01Booster: Japan-based open innovation accelerator co-operating the NGAS-Accelerator Program with Nihonkai Gas Kizuna and Nihonkai Lab. Directly comparable as a startup-enterprise co-creation platform active in the same regional ecosystem.
• Arcel Technologies: EV smart charging management company partnering with Nihonkai Gas on genetic-algorithm-based charging optimization. Comparable as an emerging energy-adjacent software player integrating with regional utility pilots.

Regional players

• Hokuto Natural Gas: Hokkaido-based city gas utility with similar regional monopoly structure and cogeneration / household energy services portfolio. Comparable business model but operates in a different geography from Nihonkai Gas Kizuna.

Direct peers

• Hiroshima Gas: Regional gas utility serving the Hiroshima area with LNG city gas supply, gas appliances, and energy solutions for residential and commercial customers. Directly comparable as a mid-sized Japanese regional gas operator pursuing diversification beyond core gas.
• Saibu Gas: Regional gas utility serving northern Kyushu with city gas, LP gas, and energy services. Comparable as a regional Japanese gas operator pursuing cogeneration, renewable, and lifestyle business diversification.
• Hokuriku Gas: Regional city gas utility headquartered in Niigata serving the Hokuriku and northern Kanto regions. Closest geographic peer to Nihonkai Gas Kizuna, with overlapping city gas supply, LP gas, and household energy services in similar regional markets.
• Shizuoka Gas: Regional Japanese city gas and LP gas utility serving Shizuoka Prefecture with a comparable portfolio of residential gas supply, cogeneration, and energy services. Comparable in scale, business mix, and regional-utility operating model.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat6 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xtwitter.com/ngasHD_official
• YouTubeyoutube.com/@hd.ngas.
• Facebookfacebook.com/hd.ngas.inc
• Instagraminstagram.com/hd_ngas_official

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Subsidiaries12 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments1 record

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about NIHONKAIGAS KIZUNA