A federal judge dismissed the charges against ComEd as part of a dismissed prosecution agreement that included a $200 million fine.
SEE ALSO | What 'ComEd Four' trial guilty verdicts mean for Mike Madigan bribery, racketeering trial
In a statement, the company's CEO said, "With the completion of the DPA and dismissal of the charge, ComEd remains committed, at all levels of the company, to the highest standards of integrity and ethical behavior for our business, and to continuing to build the trust of our customers."
The company had been accused of trying to influence Madigan by providing financial benefits and even jobs to those close to him.
Madigan himself is due to face a jury in April.
Four others charged separately were found guilty back in May and will be sentenced in January.