Members of a state Senate committee sharply criticized a recent audit of Exelon’s nuclear power plant operations that suggested ratepayers may need to subsidize two of those plants by as much as $350 million over the next five years. Gov. JB Pritzker’s office and the Illinois Environmental Protection Agency commissioned the audit last year, at a cost of $208,000, after Exelon announced in August that it plans to shutter its Byron and Dresden power plants later in 2021. The audit, by the consulting firm Synapse Energy Economics Inc., was released in redacted form on IEPA’s website Aug. 14. But Sen. Michael Hastings, D-Frankfort, who chairs the Energy and Public Utilities Committee, criticized many of the redactions and insisted lawmakers be given complete copies of the report.