The Federal Housing Finance Agency violated federal law when it rolled back the Property Assessed Clean Energy program without going through the required notice and comment period, a California federal judge ruled earlier this month. U.S. District Judge Claudia Wilken’s Aug. 9 ruling held that the FHFA was not acting as conservator of Fannie Mae and Freddie Mac but as a regulator that had improperly exercised substantive regulatory oversight in violation of the Administrative Procedure Act when the agency put a stop to GSE involvement with PACE programs.“The FHFA’s directives on PACE obligations amount to substantive rule-making, not an interpretation of rules that would be exempt from the notice and comment requirement,” wrote Judge Wilken. “The notice and comment process must be followed.”