110 Copyright © 2019, IGI Global. Copying or distributing in print or electronic forms without written permission of IGI Global is prohibited. Chapter 6 DOI: 10.4018/978-1-5225-9257-0.ch006 ABSTRACT Two of the important topics concerning scientists and governments are blockchain and climate change. After the paper of Satoshi Nakamoto, blockchains became a global phenomenon. After its usage for cryptocurrencies, blockchain is starting to be used for digital protocols and smart contracts. Blockchain technology is used in many sectors, such as banking, fnance, car leasing, entertainment, energy, etc. Climate change leads to global warming, which means the long-term warming of the planet. Therefore, governments have made an efort to decrease global warming or keep it stable. One of the mitigation ways of global warming is to use renewable energy. Solar energy is one of the most used types of renew- able energy sources, and also blockchain technology is widely used in this sector. In this chapter, the authors investigate the use of blockchain technology in the solar energy sector. INTRODUCTION Blockchain provides peer-to-peer transaction platforms that use decentralized storage to record all transac- tion data. Blockchain applications are used in different industries. These industries are digital securities trading industry, digital identity industry, proof of ownership industry, peer-to-peer transactions industry, network infrastructure industry, etc. Based on their stage of development Blockchain applications can be divided into three broad categories namely: “Blockchain 1.0”, “Blockchain 2.0”, “Blockchain 3.0”. The first category comprises cryptocurrencies, the second category represents a digital protocol, and the last category is the stage where the smart contract concept is developed. Solar energy is one of the renewable energy sources which is essential for sustainable human life and fight against climate change. Solar energy is widely used green energy type which can intelligently integrate the actions of all connected users thus they can both produce and consume electricity using Blockchain Technology in Solar Energy Erginbay Uğurlu Istanbul Aydın University, Turkey Yusuf Muratoğlu Hitit University, Turkey