Cal. Code Regs. tit. 20, § 2904
Carbon dioxide that is sequestered is not included in the CO2 emissions compliance obligation for power plants.
Wi. Admin. Code § NR.437.01 et seq.
Implementing regulations for Wi. Stat. Ann. § 285.78 that creates reates a registry for persons to record voluntary GHG emissions reductions, through either carbon sequestration or energy efficiency measures, to show compliance with emission limits.