Saisan

What Saisan does

Saisan (株式会社サイサン), founded in 1945 and headquartered in Omiya, Saitama, Japan, is a privately held, family-controlled diversified energy company operating under the Gas One Group brand. It supplies LP gas, city gas, electricity, industrial gases, medical gases, natural water delivery, and home renovation services to residential, commercial, industrial, medical, and government customers across 37 Japanese prefectures and 9 overseas countries (Mongolia, Vietnam, Indonesia, Bangladesh, Nepal, Thailand, Laos, India, and Rwanda). The company distributes through a multi-channel model combining direct enterprise sales, a nationwide franchise network (Gas One Shops), a dealer association (Gas One-kai), regional offices, and a proprietary e-commerce platform (gasoneshop).

The company's core technology stack consists of LP gas and city gas distribution infrastructure (Gas One Park Ageo and Iwata are among Japan's largest inland LP gas centers), industrial gas supply systems, IoT-based remote camera and central monitoring for safety, smart meter integration via partnership with Greenlight Planet, and renewable generation assets (Ene One Solar Park). Carbon Offset LP Gas and Carbon Neutral Electricity SKUs extend the platform into ESG-positioned offerings. The revenue model is a hybrid of usage-based billing (LP gas, industrial gases, medical gases) and subscription/recurring billing (city gas, electricity, water delivery), supplemented by one-time remodeling fees. Multiple sub-brands (Ene One, Water One, Reform One, Heart One) operate as modules on top of the core Gas One customer relationship, enabling cross-sell to existing households.

In September 2024, Saisan executed a holding company restructuring under Gas One Holdings (ガスワンホールディングス), creating four regional operating holding companies (Tohoku, Kitakanto, Saitama, Minamikanto). Through this structure the group absorbed eight-plus regional LP gas operators in 2025 alone, indicating an active domestic roll-up strategy. International operations extend to 9 countries via wholly-owned subsidiaries; the May 2024 entry into Rwanda via the Jibu Gas One JV marked African market entry. Leadership transitioned in October 2025 from Chairman Kawamoto Takehiko to President Kawamoto Tomohiko, completing a planned intra-family succession with no change in strategic direction.

Name

Saisan

Legal name

株式会社サイサン

Website

https://saisan.net

Company type

Private

Founded year

1945

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Saisan is a privately held Japanese energy distributor operating under the Gas One Group, supplying LP gas, city gas, electricity, industrial and medical gases, water, and home services to residential, commercial, and industrial customers across 37 Japanese prefectures and 9 countries.

Ownership category

akta.pro rank

Product category

LP Gas Distribution and Energy Services

NAICS

Natural Gas Distribution (22121), Industrial Gas Manufacturing (32512)

SIC

Natural Gas Distribution (4924), Electric, Gas & Sanitary Services (4900)

akta.pro primary industry

Gas Supply, Aggregation & Contracting (Producers, Marketers, Tolling, GSA) (EUALALAD)

akta.pro secondary industries

Industrial Gas Infrastructure & Metering (Onsite Storage, PRS, Metering, SCADA) (EUALALAH), Local Distribution Company (LDC) Natural Gas Distribution Utilities (TLAGADAA)

Keywords

• LP gas distribution
• City gas supply
• Electricity retail
• Industrial gas supply
• Home energy services

Headquarters

HQ city

Omiya

HQ country

Japan

HQ region

Asia

Offices4 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Supply Chain, Operations, Infrastructure, Personnel, Marketing or Sales

Revenue model

1. LP Gas Sales: Core revenue stream from liquefied petroleum gas distribution to residential, commercial, and industrial customers across Japan
2. Industrial Gases: Industrial gas products for manufacturing and industrial applications
3. Medical Gases: Medical gas products and services for healthcare facilities and providers
4. City Gas Operations: City gas distribution infrastructure serving residential and commercial customers
5. Electricity Provision: Electricity sales and distribution services
6. Water Delivery Services: Bottled and bulk water delivery services
7. Home Remodeling Services: Kitchen and bathroom remodeling services for residential customers

Pricing tiers

Go-to-market motion3 records

Distribution channels5 records

Marketing channels10 records

Core offering

Saisan distributes and supplies LP gas (Gas One), city gas, electricity (Ene One), industrial gases, and medical gases to residential, commercial, industrial, and healthcare customers across Japan. The company also provides complementary services including natural water delivery (Water One), home renovation (Reform One), visiting nursing (Heart One), and operates overseas LP gas distribution in 9 countries. Revenue is generated through usage-based gas/electricity billing, subscription water delivery, and one-time home remodeling contracts under the Gas One Group umbrella.

Product overview

Saisan operates as a diversified energy company under the Gas One Group brand, offering an integrated portfolio of energy and lifestyle services. The core offerings include LP gas (Gas One), electricity (Ene One), natural water delivery (Water One), city gas, medical gases, and home nursing services. The company follows a platform-plus-modules architecture where Gas One serves as the primary brand, with specialized products like Water One Clear (water purification), Reform One (renovation), Heart One (nursing), and various carbon-neutral/offset offerings as add-on services. The portfolio also includes industrial gases, GHP air conditioning systems, and international LP gas operations spanning 9 countries across Asia and Africa.

Differentiator

Problem solved

Functional benefit

Brands

• Gas One: Core LP gas and city gas brand; means 'Customer First No.1', regional No.1, and industry No.1. Primary consumer and business energy brand.
• Ene One (エネワン)
• Water One (ウォーターワン)
• Reform One (リフォーム・ワン)
• Heart One (ハートワン)
• Gas One 海外事業
• ガスワン (Gas One)

Products and services

• Gas One LP Gas (LPガス事業) LP gas retail and wholesale services for residential and commercial customers, including supply, safety maintenance, and cylinder delivery, distributed under the Gas One brand via franchise and dealer networks across Japan.
• City Gas (都市ガス事業) City gas supply services across Tokyo Gas, Osaka Gas, Toho Gas, Seibu Gas, and Hokkaido Gas supply areas, following the 2017 deregulation of the Japanese gas retail market.
• Ene One Electricity (電気事業) Electricity retail services for residential and commercial customers via subsidiary Ene One Denki Co., Ltd. (株式会社エネワンでんき), including carbon-neutral electricity plans, solar power park management, and food loss reduction plans.
• Water One Natural Water Delivery (アクア事業) Natural mineral water delivery service (宅配水) sourced from Mt. Fuji, Mt. Aso, Okinawa, and Shimane, with non-heated bottling for freshness, plus the Water One Clear purification-type water server.
• Industrial Gases (産業用ガス事業) Industrial gases including nitrogen, oxygen, argon, helium, hydrogen, CO2, acetylene, ammonia, laser gases, and welding gases for manufacturing and industrial applications, including LNG plant construction and supply.
• Medical Gas (医療用ガス事業) Medical gas supply including oxygen, nitrogen, nitrous oxide, and medical equipment rental for hospitals, clinics, and home healthcare patients, including home oxygen therapy equipment.
• Heart One Visiting Nursing (訪問看護事業) Visiting nursing service providing home-based medical care, rehabilitation, and support for patients with chronic conditions, established 2015 in Saitama under the Heart One brand.
• Reform One Home Renovation (リフォーム事業) Home renovation services covering exterior, roofing, interiors, plumbing, universal design, and complete remodeling for residential properties, offered under the Reform One brand.
• Gas One Shop E-commerce (ネット通販事業) Online e-commerce platform for household and commercial gas appliances, kitchen products, disaster prevention goods, and local specialty foods, operated at gasoneshop.com.
• Overseas LP Gas Business (海外事業) LP gas supply operations across 9 countries including Mongolia, Vietnam, Indonesia, Bangladesh, Nepal, Thailand, Laos, India, and Rwanda, operated through wholly-owned local subsidiaries.

Quantifiable outcome

• Revenue of 197.6 billion JPY (FY Aug 2025)
• +1 more outcomes

Named customers3 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

Feature4 records

Partnerships

Four partnerships are on record, tiered core and minor.

• Jibu Inc. (Jibu Gas One)coreStrategic or Co-development PartnerJoint venture partnership for Africa LP gas market expansion. Jibu Inc. is the parent company of Jibu Gas One, partnering with Saisan for international expansion of LP gas services into African markets.
• Japan PostminorOthersRecycling program partnership with Japan Post for environmental initiatives.
• Local Gas Companies (Gas One Group)coreChannel Partner/ Reseller/ DistributorVarious local gas companies that have joined the Gas One Group network, expanding distribution coverage across Japan.
• Gas One Shop FranchiseescoreChannel Partner/ Reseller/ DistributorFranchise dealer network operating under the Gas One brand ('ガスワンショップ' and 'ガスワン会' association).

Scale indicators5 records

Recent moves10 records

Expansion highlights5 records

Direct peers

• Air Water Inc. Japanese industrial gas major producing and distributing oxygen, nitrogen, argon, hydrogen, and medical gases. Direct overlap with Saisan's industrial and medical gas segments, with broader manufacturing depth.
• Iwatani Corporation: Japan's largest LP gas retailer with national coverage and a parallel industrial/medical gas franchise. Closest functional mirror to Saisan's LP gas + industrial gas + energy platform, competing head-to-head in residential LP gas and bulk industrial supply.
• Nippon Gas (Nihon Gas): Listed Japanese LP gas retailer with multi-million-customer residential base and growing electricity offering. Direct competitor in residential LP gas and increasingly in bundled electricity/gas services post-deregulation.

Regional players

• Toho Gas Co., Ltd. Regional gas utility serving the Chubu/Nagoya area with city gas, LP gas, and electricity retail. Saisan explicitly serves Toho Gas supply areas; partial geographic overlap creates direct competition in Chubu.

Broad incumbents

• Tokyo Gas Co., Ltd. Japan's largest city gas utility with nationwide retail reach post-deregulation. Competes with Saisan's city gas and electricity lines via scale advantages, brand recognition, and pipeline infrastructure; broader portfolio than Saisan's LP-gas-heavy mix.
• Osaka Gas Co., Ltd. Major Japanese gas utility expanding LP gas and electricity retail nationally after 2017 deregulation. Overlaps with Saisan in city gas supply areas (Kansai) and increasingly in cross-utility bundling.
• ENEOS Holdings: Japan's largest energy conglomerate with downstream LP gas, city gas, and electricity exposure. Competes indirectly in retail LP gas and increasingly in integrated energy retail; vastly larger scale and capital access.
• Taiyo Nippon Sanso (Nippon Sanso Holdings): Global industrial gas company with significant Japanese operations across oxygen, nitrogen, specialty, and electronic gases. Competes with Saisan in industrial gas supply; broader multinational footprint than Saisan's overseas LP gas presence.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/saisan_sns
• YouTubeyoutube.com/channel/UC_47mfQtzvL9Be6OV3YUfjQ
• Facebookfacebook.com/saisan.net
• Instagraminstagram.com/gas_one_saisan
• TikToktiktok.com/@gasone_tiktok

Revenue estimate

Valuation estimate

Number of profiles

Profiles18 records

Subsidiaries27 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 Saisan