We achieved our short-term target to reduce our net carbon intensity by 2-3% compared with 2016, the base year, with a 2.5% reduction in 2021. We achieved this reduction by shifting our portfolio to lower-carbon energy products such as natural gas, power and biofuels, which now make up 55% of our total energy sales, compared with 46% in 2016.
In 2021, Shell’s net carbon intensity was 77 gCO₂e/MJ, a 2.7% increase from the previous year. This increase was largely because we made a change in our methodology to better calculate the carbon intensity of our electricity sales. This approach distinguishes between the certified renewable electricity we purchase, electricity from our own generation, or purchased through a power purchase agreement, and electricity purchased from the grid.