Deputy Gov. Christian Mitchell faced questions from Sen. Michael Hastings (D-Tinley Park) and Sen. Sue Rezin (R-Morris) on Thursday about a heavily redacted audit of Exelon.

Lawmakers pushed back Thursday against Gov. JB Pritzker’s administration and an outside firm over their recently released independent audit into energy mega-firm Exelon that called for providing additional subsidies to Illinois’ nuclear power plants.

Last week, the administration released the findings of an audit by Synapse Energy Economics, a Massachusetts-based firm, which reviewed Exelon’s nuclear fleet in Illinois.