Smart grids are the backbone of existing energy production and supply scenario in today’s society. Gradual increasing demand of energy has certainly emphasized the significance and provenance of reliability and predictive aspects over smart grids. Conventional smart grids under perform in terms of self-aware behavior, especially in delay tolerance, energy requirement, and dissemination of monitoring notions. Highly distributed geographical distribution sometimes cause problems for smart grids to provide necessary services to both the consumers and prosumers. Internet of Things (IoT) is thus integrated with smart grids to facilitate distributed monitoring services for smooth running of the smart grid. Although, IoT has remarkably supported smart grids to perform smarter than ever, it lacks in security, decentralization, transparency, and trust-less approaches. Thus, blockchain is envisaged to leverage minimizing such gaps and to pave new horizon in the blockchain-IoT enabled smart grid monitoring. In this paper, we investigate how blockchain and IoT together can improve existing smart grid ecosystem toward facilitation of better monitoring services. We do this via a Systematic Literature Review. Firstly, we present preliminaries behind the study, followed by in-depth review of different domains of IoT-based smart grid monitoring. Next, we discuss various attributes of blockchain-IoT derived smart grid management schemes. Then, we discuss possible opportunities and benefits of using blockchain with respect to blockchain-IoT based smart grid monitoring. Finally, we illustrate open research challenges and future directions in the aforementioned aspects. The article concludes that with certain changes in current blockchain technology, it can surely encompass the direction of enhanced monitoring of IoT based smart grid.

智能电网是当今社会现有能源生产和供应场景的支柱。能源需求的逐渐增加无疑强调了智能电网可靠性和预测方面的重要性和起源。传统的智能电网在自我意识行为方面表现不佳，尤其是在延迟容忍度、能源需求和监测概念的传播方面。高度分布式的地理分布有时会导致智能电网向消费者和产消者提供必要服务的问题。因此，物联网 (IoT) 与智能电网相结合，以促进分布式监控服务，从而实现智能电网的平稳运行。虽然物联网显着支持智能电网比以往任何时候都更智能，但它缺乏安全性、分散性、透明度、和无信任的方法。因此，预计区块链将最大限度地减少此类差距，并为支持区块链物联网的智能电网监控开辟新的视野。在本文中，我们研究了区块链和物联网如何共同改进现有的智能电网生态系统，以促进更好的监控服务。我们通过系统文献综述来做到这一点。首先，我们介绍了研究背后的初步研究，然后深入回顾了基于物联网的智能电网监控的不同领域。接下来，我们讨论区块链-物联网衍生的智能电网管理方案的各种属性。然后，我们讨论在基于区块链物联网的智能电网监控方面使用区块链的可能机会和好处。最后，我们说明了上述方面的开放研究挑战和未来方向。