New brine infographic

Posted on February 27, 2018

A new infographic on the Alton website helps explain how much brine will be released into the tidal water of the Shubenacadie River estuary as the natural gas storage caverns at Alton are developed. Here’s the infographic:


At Alton, the brine is created when water from the Shubenacadie River estuary slowly dissolves an underground salt deposit over two to three years to create the natural gas storage caverns. Nothing is added to the water. The deep, underground salt deposit where the natural gas storage caverns will be located is essentially pure salt, created by ocean water evaporation approximately 330 million years ago. Learn more about brining, and the salt deposit, in the environment section of the Alton website.

In the brining process, the brine from the caverns will be pumped to a holding pond and then slowly released with the tide into a constructed channel alongside the Shubenacadie River estuary. Constant, real-time salinity monitoring takes place in the channel as well as up river and down river from it.

The Shubenacadie River estuary experiences a wide range of salinity with the tides and rainfall. The slight increase in salinity from brining is insignificant in terms of the natural salinity changes that the river’s biological community experiences with each turn of the tide.

Visit  to learn more about the Alton Natural Gas Storage Project.