It depends on wether volume matters or not. The comment you are replying to speaks about seasonal storage. You can use caverns for that, like with natural gas.

It depends on wether volume matters or not. The comment you are replying to speaks about seasonal storage. You can use caverns for that, like with natural gas. You only need around 3 times the volume to store the same energy as with natural gas. For vehicles like trains it can still be advantageous compared to batteries if you have very long ranges you have to drive without the possibility to recharge. Batteries simply get too heavy, bulky and expensive then.