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- NNGTS Access Guide
- Transmission Users Information
- Relevant Points and Capacities (Technical/Booked/Available)
- Additional Transportation Capacity for Delivery
- Historical Data of Transmission System Operation
- Historical Data of Natural Gas Quality
- Hourly Quality Data of Interconnection Points
- Historical Data of Gross Calorific Value
- Historical Data of Natural Gas Deliveries / Off – Takes
- Capacity usage at Entry / Exit Points – Historical Data
- Secondary Market of Natural Gas Transmission System
- Historical Data of Natural Gas Pressure in Entry Points
- Historical Data of N.G. Nominations
- Linepack Calculation
- NNGTS Maintenance/Calibration Program
- Natural Gas Quality Specification
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- Annex I of Regulation 715/2009
- Commission Regulation (EU) 2017/460
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- List of Supplementary Transmission Services
- Additional LNG Services
- Οther Non Regulatory Services
- Polyethylene Welding Certification
- Gas Metrology Services
- Operation and Maintenance of Natural Gas Distribution Network
- Natural Gas Odorization Services
- Administrative, Technical & Meteorological user support in measuring stations
- Vehicle Gas Refueling Stations (CNG)
- Technical Consulting Services
- Corrosion and Lightning Protection
- Natural Gas Transmission System Technical Support
- Non Destructive Testing (NDT) Services
- Provision of Operational Data
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