For a new kind of electrical system, the smart grid is using more battery storage and clean energy sources compared to what is normally used by the power grid. Historically, big data and the Internet allowed scientists to find a solution that resulted in the wealth of ideas behind the energy Internet called the intelligent grid. With its unique characteristics, blockchain technology shows promise as a way to solve security problems and boost confidence in smart grid standards. This paper does a thorough analysis of blockchain applications with an emphasis on cybersecurity issues and energy data protection in smart grids. It explores the serious security issues that arise in smart grid situations and clarifies how big data and blockchain might provide practical answers. The study sheds light on the security concerns for smart grid systems by surveying current blockchain-based research endeavors from a variety of publications. Furthermore, useful ideas, tests, and advancements in this field are covered. The study's conclusion outlines important research questions and possible applications of blockchain technology to smart grid security challenges.