FAQs > Rule Subparts > Subpart DD. Electrical Transmission and Distribution Equipment Use > Q629. To what extent does a subpart DD facility include potential subpart C sources located in the same physical structure? Would it include sources using natural gas for comfort heating in warehouses and office complexes on the electric power system?

Versions Compared


  • This line was added.
  • This line was removed.
  • Formatting was changed.
Comment: Migration of unmigrated content due to installation of a new plugin



A629. When dealing with subpart C and subpart DD there are two different definitions for facility. In general, for subpart DD, the facility is comprised of the electric transmission and distribution equipment, and excludes any fuel combustion equipment. Please review the definition of facility for subpart DD found within § 98.308. The definition of facility that applies to stationary fuel combustion sources (subpart C) is found within Subpart A. If at some location there is equipment potentially subject to subpart DD and subpart C, then that location contains two facilities; and applicability should be evaluated separately for each facility according to the appropriate facility definition. For example, if the electrical equipment is part of an electrical power system that is subject to subpart DD, that does not automatically mean that emissions from the fuel combustion equipment must be reported. Applicability to subpart C would be evaluated separately.



Updated on

Page info
dateformatdd/MM/YY HH:mm

Wiki Markup
{show-to:group=confluence-Users}{_}Footer / References Bar which is Visible to the public{_}{show-to}
Wiki Markup
Source: RT #7556 / Jira #19807

Approval / Publishing History: Version 1, approved by L. Grogan-McCulloch, 2/14/2013

Expiration: none

Relevant Subpart: DD
{info}{_}History Panel For Internal Use - Not Visible to the Public{_}{show-to}

This web site is maintained by a contractor to the U.S. Environmental Protection Agency (RY2019.R.01)