A surge in interest in blockchain technology in recent years has resulted in the creation of several applications based on the platform that use its fault tolerance, decentralization, transparency, and high security. However, there are issues with the block-chain technology itself, such as sluggish processing times and insufficient privacy protection. Therefore, in order to maximise the advantages of block-chain and minimise its disadvantages, it is imperative to do research on how to more effectively integrate block-chain with smart grids. This article investigates novel methods for integrating the developing block-chain technology along with smart grids. This study aims to address the need for integrating block-chain into various smart grid components, highlight the frameworks and methodologies used to do so, and highlight the issues with current solutions. We also provide in-depth comparative studies of block-chain-based solutions for smart grids from multiple aspects in order to shed light on how to connect block-chain and smart grids to perform various management tasks. Last but not least, we give a rundown of the on-going initiatives and projects that serve as examples of the present practice-side endeavour.