Comparison of the characteristics of compressed air energy storage in dome-shaped and horizontal aquifers based on the Pittsfield aquifer field test

•CAES performances in the dome-shaped and horizontal aquifers were numerical modeled.•Differences of CAES in the dome-shaped and horizontal aquifers were quantified.•Initial air bubble in horizontal aquifer is 16.7% larger than in the dome-shaped aquifer.•Energy recovery efficiency of CAES in aquifers was calculated in terms of exergy.•Daily efficiency in the horizontal aquifer can reach approximately 80% of that in the dome-shaped aquifer.