Limiting warming to the Paris temperature goals requires a rapid scale-up of low-carbon energy, yet recent experience suggests that deployment is increasingly shaped by delivery constraints rather than by technology cost trends alone. This review synthesizes peer-reviewed evidence on five constraints that repeatedly slow net-zero buildouts: lengthy approval and grid-connection processes; capital-intensive investment profiles that heighten sensitivity to the cost of capital and revenue risk; bottlenecks in critical minerals, processing, and manufacturing; social contestation and local governance that translate into siting exclusions, delays, and cancellations; and modeling traditions that can underrepresent these non-marginal frictions. Accordingly, we adopt an energy-services perspective to examine how demand-side strategies affect the scale and timing of the required buildout. We interpret degrowth as service-based sufficiency, rather than as a blanket reduction in welfare, and organize the evidence using the Avoid, Shift, Improve (ASI) sequence. Across sectors, the reviewed literature indicates that lowering baseline service demand and, in particular, peak requirements can reduce project counts and network upgrades, limit exposure to interconnection queues and permitting backlogs, ease upstream material pressures, and improve bankability under risk-averse finance. We conclude that net-zero pathways are more credible when service provision and demand-side design are treated as core planning variables alongside clean-energy supply expansion.
Ge et al. (Thu,) studied this question.