Saisan
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.
- Company typePrivate
- Founded1945
- HeadquartersOmiya, Japan
- Headcount1,001–5,000
- GTM typeB2B and B2C
- OfferingServices
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.
Saisan firmographics
Firmographics- 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
Saisan industry classification
Industry- 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
Where Saisan is headquartered
LocationHeadquarters
- HQ city
- Omiya
- HQ country
- Japan
- HQ region
- Asia
Offices4 records
Markets served
Saisan business model
Business model- GTM type
- B2B and B2C
- Offering type
- Services
- Cost components
- Supply Chain, Operations, Infrastructure, Personnel, Marketing or Sales
Revenue model
- LP Gas Sales: Core revenue stream from liquefied petroleum gas distribution to residential, commercial, and industrial customers across Japan
- Industrial Gases: Industrial gas products for manufacturing and industrial applications
- Medical Gases: Medical gas products and services for healthcare facilities and providers
- City Gas Operations: City gas distribution infrastructure serving residential and commercial customers
- Electricity Provision: Electricity sales and distribution services
- Water Delivery Services: Bottled and bulk water delivery services
- Home Remodeling Services: Kitchen and bathroom remodeling services for residential customers
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Usage-based | Monthly | Regional LP gas pricing |
| Subscription | Monthly | Electricity services |
| Subscription | Monthly | Water delivery service |
Go-to-market motion3 records
Distribution channels5 records
Marketing channels10 records
Saisan product offering
Product offeringCore 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
Companies that use Saisan
Customer profileNamed customers3 records
Segments5 records
Ideal customer profiles4 records
Saisan technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
Saisan partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered core and minor.
- Jibu Inc. (Jibu Gas One)coreJoint 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 PostminorRecycling program partnership with Japan Post for environmental initiatives.
- Local Gas Companies (Gas One Group)coreVarious local gas companies that have joined the Gas One Group network, expanding distribution coverage across Japan.
- Gas One Shop FranchiseescoreFranchise 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
Saisan competitors and assessment
Company assessmentDirect 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
Saisan social profiles
Digital presenceSaisan financial estimates
Financial estimateRevenue estimate
Valuation estimate
Saisan leadership team
Management profileNumber of profiles
Profiles18 records
Saisan subsidiaries and ownership
Company hierarchySubsidiaries27 records
Saisan funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Saisan M&A and investment
M&A and investmentM&A
Investments1 record
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Saisan
What does Saisan do?
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.
Is Saisan a public or private company?
Saisan is a private company. It is classified as family owned and is currently operating.
When was Saisan founded?
Saisan was founded in 1945. It employs 1,001 to 5,000 people.
Where is Saisan based?
Saisan is headquartered in Omiya, Japan, in the Asia region.
How does Saisan make money?
Seven revenue lines are on record. LP Gas Sales are the primary driver. The others are industrial Gases, medical Gases, city Gas Operations, electricity Provision, water Delivery Services and home Remodeling Services.
Who are Saisan's main competitors?
Direct peers on record are Air Water Inc., Iwatani Corporation and Nippon Gas (Nihon Gas). Toho Gas Co., Ltd. is listed as a regional player. Broad incumbents are Tokyo Gas Co., Ltd., Osaka Gas Co., Ltd., ENEOS Holdings and Taiyo Nippon Sanso (Nippon Sanso Holdings).
Does Saisan have an API?
No public API is recorded for Saisan.
What industry is Saisan in?
Saisan's product category is LP Gas Distribution and Energy Services. Its primary akta.pro industry code is EUALALAD, Gas Supply, Aggregation & Contracting (Producers, Marketers, Tolling, GSA), with a secondary code of EUALALAH, Industrial Gas Infrastructure & Metering (Onsite Storage, PRS, Metering, SCADA). Its NAICS code is 22121 and its SIC code is 4924.