Scalable Consensus Mechanisms for Energy-Efficient Blockchain Networks

Abstract

Abstract: The rapid proliferation of blockchain technology has intensified concerns over the energy inefficiency of traditional consensus mechanisms, particularly Proof of Work (PoW). This study investigates alternative, scalable consensus mechanisms with a focus on enhancing energy efficiency while maintaining performance and decentralization. The evaluation centers on Proof of Stake (PoS), Delegated Proof of Stake (DPoS), and Practical Byzantine Fault Tolerance (PBFT), using empirical simulations and statistical modeling to assess key performance indicators—energy consumption per transaction, transaction latency, and throughput. The results indicate that PoS is the most energy-efficient, consuming only 0.04 kWh per transaction, whereas DPoS offers the highest throughput at 1400 transactions per second with moderate energy requirements. PBFT demonstrates the lowest latency but at the cost of increased energy usage. Predictive regression analysis further reinforces the trade-offs between energy use and scalability across consensus mechanisms. These findings highlight the importance of selecting consensus algorithms based on specific application requirements and environmental considerations. The study provides a data-driven framework for guiding the design and adoption of energy-conscious blockchain infrastructures suitable for sustainable and large-scale deployment. Keywords: Blockchain, Consensus Mechanism, Energy Efficiency, Scalability, Proof of Stake, Delegated Proof of Stake, PBFT, Distributed Systems, Transaction Throughput, Green Blockchain Technologies