Carbon Stock Accounting

PRU ACCOUNTING

The PRUs are calculated using the following equation:

• Where: 
  • 𝗣𝗥𝗨 = Projected Restoration Units; tCO2e.
  • 𝗣2.5 = indicates the 2.5th percentile, which corresponds to the lower 95% of the distribution.
  • 𝗖с𝖺𝗉𝖺𝖼𝗂𝗍𝗒= Project's GHG removal capacity; tCO2e.
  • 𝗕 =  Total estimate of the baseline GHG removals for the Project; tCO2e.
  • 𝗟= Total declared Leakage at Project start; tCO2e.

VRU ACCOUNTING

PRUs conversion into VRUs is performed every two (2) or four (4) years after Verification, and throughout the Project’s crediting period. Before each Verification and to ensure the most accurate conversion of units, ERS measures carbon stock in the Restoration Site, factoring:

1. Biomass evolution in the Restoration Site. The carbon stock evolution at the Restoration Site is calculated by comparing the total biomass at Verification Cycle t, with the total biomass at Verification Cycle t–1. This evaluation includes any loss events that occurred on the Restoration Site during Verification Cycle t.
2. Leakage correction. The leakage evolution observed during the Verification Cycle t. Note that leakage is quantified and corrected accordingly only until year four.
3. Baseline correction. The carbon stock evolution monitored in the control plots during the Verification Cycle t.

The VRUs for a given Verification Cycle (t) are calculated using with the following equation:

• Where: 
  • 𝗩𝗥𝗨t= Net GHG removals observed during the Verification Cycle t; tCO2e.
  • 𝗣2.5 = indicates the 2.5th percentile, which corresponds to the lower 95% of the distribution.
  • 𝗖t = Carbon removals achieved during the Verification Cycle t; tCO2e.
  • 𝗟t𝖼 = Corrected Leakage at the Verification Cycle t; if t>4, 𝗟t𝖼=0; tCO2e.
  • 𝗕t𝖼  = Corrected Baseline at the Verification Cycle t; tCO2e.