Bill > HB507

This bill requires data centers applying for permits after July 1, 2026, to ensure their backup generators, known as engine-generator sets or gen-sets, meet "Tier 4 equivalent" emission standards. Tier 4 equivalent refers to advanced pollution control technology that significantly reduces emissions of nitrogen oxides, carbon monoxide, and particulate matter, similar to systems like selective catalytic reduction, diesel oxidation catalysts, and diesel particulate filters. This means new or modified backup generators at data centers must be equipped with these advanced controls to limit their environmental impact. The bill also clarifies that the Department of Environmental Quality can still impose even stricter emission limits if deemed necessary, and this requirement does not prevent the Department from applying other established environmental standards like Best Available Control Technology or New Source Performance Standards.

Agriculture and Natural Resources

https://lis.virginia.gov/bill-details/20261/HB507