Definitions

The following words and terms, when used in this Subchapter, shall have the following meaning, unless the context clearly indicates otherwise. Except as specifically provided in this section, terms used in this Subchapter retain the meaning accorded them under the applicable requirements of the Act. "Baseline actual emissions for ERC generation" means a source’s emissions calculated using the procedure in OAC 252:100-10-4(a)(1). For the purposes of ERC generation, baseline actual emissions for ERC generation shall be established in units of tons per year. "Emission Reduction Credit" or "ERC" means a documented decrease in actual emissions which are permanent, verifiable, federally enforceable, and surplus on generation and on use. An ERC does not constitute a property right. "Emission Reduction Credit generator" or "ERC generator" means the owner or operator of a facility that obtains an NSR permit that results in the creation of ERCs. "Emission Reduction Credit user" or "ERC user" means the owner or operator of a facility that obtains and extinguishes ERCs as part of a permitting action to offset project emission increases to mitigate adverse air quality impacts and to ensure that the project results in an AQAC_2026_JUL_SC_7_8_10_RUL 16 June 15, 2026 improvement in air quality due to a reduction of airshed emissions compared to a no project alternative. "Emission Reduction Credit baseline period" or "ERC baseline period" means the consecutive 24-month period used to establish baseline actual emissions for ERC generation. "Permit limited emissions for ERC generation" means the maximum allowable emissions for a source as established in an NSR permit which is used to generate ERCs. For the purposes of ERC generation, permit limited emissions for ERC generation shall be established in units of tons per year. "Project emissions increase" means the increase in facility emissions associated with a project that is the subject of a PSD permit application. Project emissions increases are calculated in accordance with OAC 252:100-8-30. "Surplus" means any emission reduction that is not otherwise relied on in the Oklahoma SIP, any SIP related requirement, any state air quality program requirement not in the Oklahoma SIP, and meets either (A) or (B) as appropriate: (A) At the time of generation, the emission reduction is not required by any applicable local, state, or federal requirement or enforcement action; or (B) At the time of use, the emission reduction would not have been required by any applicable local, state, or federal requirement that was promulgated or enforcement action that was applied after achievement of the emission reduction.