Nutter said that even a favorable decision from the commission would be meaningless without Council's approval of the sale ordinance.
"Please be assured that introduction of the sale ordinance does not trigger the PUC review process," Nutter wrote.
"I have been advised by the city solicitor that this provision has nothing to do with the start of the PUC review of the proposed sale and is solely a mutually agreed upon time line designed to keep the process moving between the city and UIL."
According to Nutter's memo, language in the asset-purchase agreement states that the parties involved must "prepare and file" joint applications to the commission "no later than 60 days following the introduction of the ordinance in City Council."
Clarke said he wants a careful and deliberate process in finalizing the $1.86 billion deal.
"Based on my interpretation of [that] provision - from my perspective - that is a trigger," he told the Daily News.
"Had I introduced the ordinance at the original request, the clock would have already been ticking. We want to review the information and determine what type of asset sale it's going to be before we file anything with anyone."
The last nine commission transaction reviews took a little more than nine months to process, on average, according to the administration.
- Staff writer Sean Collins Walsh contributed to this report
On Twitter: @RuffTuffDH