With the shale revolution, natural gas has become the biggest generating fuel for electricity in the US. This winter’s high natural gas usage brought storage levels this winter to their lowest levels since the polar vortex winter of 2014. Since the end of winter, storage levels have increased, but at a slow pace, and current storage levels are now below the levels for this week in 2014. The record levels of production from the shale revolution has created some uncertainty as to the importance of storage levels, but it is still an important data point to watch as we head toward the end of the summer. Below is a Tableau Viz that shows historic natural gas storage levels. The viz can also be viewed directly in Tableau here.