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Our Services
Transmission Services
How to become a Transmission User
Are you already a Transmission User?
Meet the Regulatory Framework
Codes and Manuals
Transmission Transparency Standard (Annex I of EC 1789/2024)
Commission Regulation (EU) 2017/460
Start your Activities
NNGTS Access Guide
Guarantees
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Booking Capacity Auctions
Access to the Virtual Trading Point
Transmission System Usage Tariff
Tariff Regulation
Current Invoice
Charges Calculation Tool
Guarantees Calculation Tool
Balancing Services
Annual Planning of Gas Balancing
Balancing Costs
Unaccounted For Gas (UFG)
Daily Inbalance Settlement Prices
Operational Gas
Operational Gas Offsetting study
Operational gas injection
Operational gas Unit charge
Operational Gas Offsetting Cost
Transmission User Information
Relevant Points and Capacities (Technical/Booked/Available)
Methodology of Capacities
Files of Capacities
Additional Transmission Capacity
Linepack
Natural Gas Quality Specification
NNGTS Maintenance/Calibration Program
Secondary Market of Natural Gas Transmission System
Forms
Gas Market Data
Virtual Trading Point
Market Shares Data
NNGS Annual Data
Historical data on the operation of the Transmission System
Historical Data of Natural Gas Deliveries / Off – Takes
Hourly Quality Data of Interconnection Points
Daily Quality Data of Entry/Exit Points
Historical Data of N.G. Nominations/Allocations
LNG Services
How to become an LNG User
Are you already an LNG User?
Meet the Regulatory Framework
Codes and Manuals
LNG Transparency Standard (ΕC 1789/2024)
Start your Activities in Revithoussa
LNG Access Guide
Guarantees
Programming Procedures
LNG Facility Use Invoice
Tariff Regulation
Current Invoice
Charge Calculation Tool
Guarantees Calculation Tool
LNG Terminal Offsetting Account Settlement
Inerting, Filling, Cooling and Partial Loading
Supply of liquid nitrogen and/or fresh water
Technical Data & Access to the LNG Facility
LNG Facility Operational Needs
LNG User Information
LNG Unloading Plan
LNG Re-Gasification Capacity
LNG Storage Facility
LNG Quality Specifications
LNG Facility Maintenance Plan
Secondary market of LNG Facility Use Service
Forms
LNG Facility Usage History
Total LNG Stock
Sum of Daily LNG Reserve & LNG Storage Space
LNG losses
Security Reserves of PPs
LNG Truck Loading Service (TLS)
How to become a TLS User
Are you already a TLS User?
Get to know the Regulatory Framework
Start your Activities
Guarantees
TLS Timeslots
TLS Tariffs
Technical Data & Access to the TLS Facility
LNG TLS Facility Maintenance Plan
Market Test
Active
Non Active
Connection to Transmission System
Active Publications
Non Active Publications
Other Services
Metrology
Odorization
Support Services at the NNGTS Entry Points
Additional Calibration Services of Metering Systems
Additional Requirements for Conducting Water Dew Point Control Measurements
Our Customers
Non Regulated Services
Operation & Maintenance Services
Supervision, Project management and control – Engineering
Consulting & Training Services
Certification Services
Technical Training Center
Training Modules
QHSE issues for the gas industry
The Pipeline Transmission System
The Liquefied Natural Gas System
The Dispatching Operation
Gas Technology
Regulatory Framework
Our Team
Quality & Certifications
E-learning Platform
Who should Attend
Research & Development Center
EU Funded Projects
Events
Electronic Information System (EIS)
Registration Procedure
Login
Digital Certificates
What if EIS is not available?
Technical Support
Urgent Market Messages
Contact us
Innovation & Renewable Gases
Hydrogen
What is Hydrogen?
The role of the network?
Participation in Projects and Groups
Declare your interest
Biomethane
What is Biomethane?
The Role of the National Natural Gas Transmission Network
Participation in Projects
Declare your interest
Carbon Capture
What is Carbon Capture?
What is the role of the transport network?
Participation in Projects
Declare your interest
Innovation
Innovation in DESFA
δ+ Innovation Center
Contact us
ESG
Environment
Environmental Footprint
Net Zero path
Energy Saving/Efficiency
Social
Corporate Social Responsibility (CSR)
ESG Reports
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Submission Form for Donation Requests
Contact us
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Our News
Press releases
NNGS Users information
Public Consultations
Tenders
Publications
Multimedia
Press Kit
Events
Contact us
Emergency Call
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(+30) 2105551666
Our Company
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Search
Our Company
Company
Mission, Vision, Values
Our People
DESFA Management
Organization
Work with us
Corporate Governance
Board of Directors (BoD)
Board Committees
General Assembly
Participation in Other Entities
Financial Statements
Internal Control and Risk Management System
Enterprise Risk Management
Compliance
Internal Audit Division
Business Ethics
Code of Ethics
Anticorruption Policy
Whistleblowing Policy
Third Party Due Diligence
Gifts Reporting
Awareness
Regulatory Framework
Union Regulatory Framework
Greek Regulatory Framework
Laws and Presidential Decrees
Ministerial Decisions
Decisions of RAAEY
Network Code
Revenue and Tariff Regulation
Tendering Procedures Framework
Contact us
Infrastructure
National Natural Gas System (NNGS)
National Natural Gas Transmission System (NNGTS)
Main Pipeline and Gas Transmission Branches
Compressor Stations
Metering / Regulating Stations at Entry – Exit Points
Gas Control and Dispatching Centers
Remote Control System & Telecommunications
Operation and Maintenance Centers
LNG Facility
Development of the NNGS
NNGS Development Plan
New projects under constructions
Facilities
Technical Job Specification List
LNG Installation
Pipelines
Civil
Cathodic Protection
Electrical
Instrumentation
Mechanical
Piping – Welding
Quality
Demand Forecast Study
NNGS Operation Reports
Security of Supply
Emergency Plan
Registry of Interruptible Natural Gas Consumers
Supply Security Levy
Information Security & Business Continuity
Health & Safety
HSSEQ
Campaigns – Collaborations
Life Saving Rules
Contact us
Our Services
Transmission Services
How to become a Transmission User
Are you already a Transmission User?
Meet the Regulatory Framework
Codes and Manuals
Transmission Transparency Standard (Annex I of EC 1789/2024)
Commission Regulation (EU) 2017/460
Start your Activities
NNGTS Access Guide
Guarantees
Transmission Services
Booking Capacity Auctions
Access to the Virtual Trading Point
Transmission System Usage Tariff
Tariff Regulation
Current Invoice
Charges Calculation Tool
Guarantees Calculation Tool
Balancing Services
Annual Planning of Gas Balancing
Balancing Costs
Unaccounted For Gas (UFG)
Daily Inbalance Settlement Prices
Operational Gas
Operational Gas Offsetting study
Operational gas injection
Operational gas Unit charge
Operational Gas Offsetting Cost
Transmission User Information
Relevant Points and Capacities (Technical/Booked/Available)
Methodology of Capacities
Files of Capacities
Additional Transmission Capacity
Linepack
Natural Gas Quality Specification
NNGTS Maintenance/Calibration Program
Secondary Market of Natural Gas Transmission System
Forms
Gas Market Data
Virtual Trading Point
Market Shares Data
NNGS Annual Data
Historical data on the operation of the Transmission System
Historical Data of Natural Gas Deliveries / Off – Takes
Hourly Quality Data of Interconnection Points
Daily Quality Data of Entry/Exit Points
Historical Data of N.G. Nominations/Allocations
LNG Services
How to become an LNG User
Are you already an LNG User?
Meet the Regulatory Framework
Codes and Manuals
LNG Transparency Standard (ΕC 1789/2024)
Start your Activities in Revithoussa
LNG Access Guide
Guarantees
Programming Procedures
LNG Facility Use Invoice
Tariff Regulation
Current Invoice
Charge Calculation Tool
Guarantees Calculation Tool
LNG Terminal Offsetting Account Settlement
Inerting, Filling, Cooling and Partial Loading
Supply of liquid nitrogen and/or fresh water
Technical Data & Access to the LNG Facility
LNG Facility Operational Needs
LNG User Information
LNG Unloading Plan
LNG Re-Gasification Capacity
LNG Storage Facility
LNG Quality Specifications
LNG Facility Maintenance Plan
Secondary market of LNG Facility Use Service
Forms
LNG Facility Usage History
Total LNG Stock
Sum of Daily LNG Reserve & LNG Storage Space
LNG losses
Security Reserves of PPs
LNG Truck Loading Service (TLS)
How to become a TLS User
Are you already a TLS User?
Get to know the Regulatory Framework
Start your Activities
Guarantees
TLS Timeslots
TLS Tariffs
Technical Data & Access to the TLS Facility
LNG TLS Facility Maintenance Plan
Market Test
Active
Non Active
Connection to Transmission System
Active Publications
Non Active Publications
Other Services
Metrology
Odorization
Support Services at the NNGTS Entry Points
Additional Calibration Services of Metering Systems
Additional Requirements for Conducting Water Dew Point Control Measurements
Our Customers
Non Regulated Services
Operation & Maintenance Services
Supervision, Project management and control – Engineering
Consulting & Training Services
Certification Services
Technical Training Center
Training Modules
QHSE issues for the gas industry
The Pipeline Transmission System
The Liquefied Natural Gas System
The Dispatching Operation
Gas Technology
Regulatory Framework
Our Team
Quality & Certifications
E-learning Platform
Who should Attend
Research & Development Center
EU Funded Projects
Events
Electronic Information System (EIS)
Registration Procedure
Login
Digital Certificates
What if EIS is not available?
Technical Support
Urgent Market Messages
Contact us
Innovation & Renewable Gases
Hydrogen
What is Hydrogen?
The role of the network?
Participation in Projects and Groups
Declare your interest
Biomethane
What is Biomethane?
The Role of the National Natural Gas Transmission Network
Participation in Projects
Declare your interest
Carbon Capture
What is Carbon Capture?
What is the role of the transport network?
Participation in Projects
Declare your interest
Innovation
Innovation in DESFA
δ+ Innovation Center
Contact us
ESG
Environment
Environmental Footprint
Net Zero path
Energy Saving/Efficiency
Social
Corporate Social Responsibility (CSR)
ESG Reports
Sustainability Policy
Submission Form for Donation Requests
Contact us
Press Center
Our News
Press releases
NNGS Users information
Public Consultations
Tenders
Publications
Multimedia
Press Kit
Events
Contact us
Emergency Call
.
(+30) 2105551666
.
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19 Dec 2025
ESG Report 2024
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11 Mar 2025
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10 Jun 2024
ESG Report 2022
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