MI HB4265

Exempts digestate from registered anaerobic digesters from the definition of "solid waste" under Michigan's Natural Resources and Environmental Protection Act

Establishes new registration requirements for anaerobic digesters that receive more than 20% of feedstock from off-site sources, including a $750 fee, 5-year registration term, and mandatory contingency plan submission

Requires quarterly testing of digestate for pathogens, nutrients, metals, and physical contaminants following American Biogas Council certification guidelines, with the department authorized to issue cease operations orders for noncompliance

Specifies 22 categories of approved anaerobic digester feedstocks, including livestock manure, food waste, yard waste, crop residuals, and various food processing byproducts

Changes annual reporting deadlines from 45 days after the state fiscal year end to January 31 following each calendar year, and requires operators to complete training within one year of registration or assuming operations