A Graphical Technique for Net-zero Emissions Planning Based on Marginal Abatement Cost (MAC) Curves
Abstract
Net-zero emission targets are being set by countries and companies
globally. To meet net-zero targets, negative emission technologies
(NETs) such as bioenergy with carbon capture and storage (BECCS) and
biochar (BC) can be implemented alongside replacing traditional energy
sources with renewables. Various high-level tools for energy planning
are available but rarely consider NETs and net-zero emissions planning.
In this work, a graphical procedure was developed using marginal
abatement cost (MAC) curves for net-zero emissions planning. Carbon
dioxide (CO
2)-emitting energy sources are arranged in increasing order of specific costs, on a specific cost vs cumulative CO
2
emissions diagram. NETs are then plotted to counterbalance the
emissions in order to determine the negative emission targets. The
methodology is illustrated with a case study in the power generation
sector. In this case, coal and natural gas (500 MW each) are used to
generate power for users. In order to reach net-zero emission for this
sector, a BECCS plant (500 MW) and a reduction in the power rating of
coal by around 200 MW is necessary. Besides, an additional 1.59 Mt/y of
CO
2 sequestration is to be carried out through BC. The
proposed technique provides a simple and clear method for net-zero
emissions planning.