- 1976 | The Portuguese Association of Liquefied Petroleum Gases (APGPL) is established .
- 1980 | Recognized as a Public Utility Entity, a status maintained to this day
- 1980 | Acknowledged as a Training Entity in the professional gas field
- 1984 | Renamed Portuguese Association for Combustible Gases
- 1990 | Recognized as a Sectoral Standardization Body
- 1997 | Acknowledged as a Notified Body for the PED directive
- 1997 | Renamed Instituto Tecnológico do Gás (ITG)
- 1999 | Recognized as a Notified Body for the TPED directive
- 2001 | ITG becomes known as Inspection Body No. I0001
- 2002 | Recognized as a Fuels Inspection Entity (EIC)
- 2019 | Statute revision to include areas of hydrogen and renewable gases
- 2022 | Recognized as a People Certification Body (OCP)
