The regulation maps out how companies can purchase gas abroad. The operators of the system - that is, Latvijas Gaze - will have to ensure access to the storage and supply, as well as transmission system.
The regulations allow natural gas users except households to buy natural gas from foreign natural gas suppliers.
Latvijas Gaze however has said that it will turn to court over any interference with the company's monopoly on natural gas until 2017.
Previously, Latvijas Gaze denied repeated requests by electricity utility Latvenergo to have access to Latvijas Gaze's infrastructure in order to buy natural gas from Lithuania.