Blockchain Technology and Its Applications in Smart Energy Systems

Blockchain Technology and Its Applications in Smart Energy Systems

Blockchain technology can be seen as a culmination of recent advances in information technology. It integrates the latest achievements in distributed data storage, peer-to-peer transmission, consensus mechanisms, and cryptographic algorithms, and can effectively address issues that have become especially prominent in the information age, such as lack of trust and data falsification. Through decentralized technologies and mechanisms, blockchain naturally creates a trustworthy digital environment, and even a more trustworthy social environment. For this reason, blockchain first became widely known through its application in virtual currency systems represented by Bitcoin. However, because of its intrinsic technical characteristics, its use is rapidly expanding beyond digital finance into smart cities, smart logistics, smart factories, smart healthcare, and many other fields and processes. Among these, smart energy systems are particularly well suited for seamless integration with blockchain technology due to their inherent characteristics.

Traditional energy projects are often massive, capital-intensive undertakings. This characteristic has made energy systems naturally monopolistic, with major energy companies holding dominant control over the main stages of energy production and transmission. In recent years, the contradiction between the rapid depletion of fossil fuels and the growing dependence of economic development on energy has made distributed renewable energy a source of hope and direction for the sustainable development of human society. Whether willingly or not, the energy industry will gradually, slowly but steadily, shift from fossil fuels to renewable energy. In renewable energy systems dominated by distributed generation, energy production, transmission, and consumption are no longer one-way processes, but instead form a more complex networked system. A factory that primarily consumes energy may also supply energy to nearby users through distributed photovoltaic systems or combined heat and power systems, while a household may likewise provide energy externally through small-scale photovoltaic panels and micro combined heat and power systems. Under such circumstances, when energy flows in multiple directions through a networked system, dispatching, metering, interaction, and optimization decisions become extraordinarily complex and difficult to control. In our research, blockchain technology is precisely the ideal solution to these problems in smart energy systems.

The simplest and most intuitive explanation of blockchain technology is that it is a distributed ledger. In traditional banking, only one centralized institution—the bank—provides bookkeeping services. In a distributed ledger system, by contrast, everyone has a synchronized ledger in hand (though this does not mean you can freely view other people’s accounts), and every transaction is recorded in every ledger. In this way, even if one ledger is lost, all accounts can still be restored, and if someone attempts to alter the ledger and tamper with the records, doing so becomes theoretically infeasible. So what roles can such decentralized blockchain technology play when applied to smart energy systems dominated by distributed structures? We believe that, based on the essence of blockchain technology, its significance for smart energy systems is mainly reflected in three aspects: metering, transactions, and decision-making mechanisms.

Energy Metering: In smart energy systems—especially regional energy networks dominated by distributed systems—the value of energy fluctuates in real time according to production and consumption levels. Each user is both an energy producer and an energy consumer, which makes the metering of energy and related costs between users highly complex. Therefore, in our smart energy metering system, energy would be divided into standardized unit modules, with each unit assigned a blockchain identifier (token). In this way, blockchain’s powerful capabilities can be used to ensure the reliability and precision of metering. At the same time, with the security technologies on which blockchain depends, we can effectively guarantee both metering security and user privacy.

System Interaction: When a large number of anonymous energy transactions take place among different users, it is difficult for a centralized system to complete them in real time. Blockchain technology, however, provides the conditions needed for such large-scale anonymous interactions. When meter identifiers are linked to personal identifiers, the inflow and outflow of energy units can automatically complete the anonymized transaction process. For example, when surplus electricity generated by a micro Stirling combined heat and power system in Household A is used by Household B through a regional energy network, the blockchain system can simultaneously and automatically complete the energy transaction between A and B. Of course, this transaction process may still ultimately need to be periodically settled into circulating currency through financial institutions. But if the financial currency system itself also widely adopts blockchain technology in the future, then the two systems should be able to connect with each other in real time.

Scheduling and Decision-Making: Real-time fluctuations in energy systems require the entire system to operate more efficiently. But independently operating distributed energy systems may not be able to automatically achieve optimal efficiency. For example, when every distributed system equipped with energy storage or combined heat and power seeks to supply more energy when prices are high, this may lead to oversupply and falling prices, or repeated severe oscillations, introducing greater instability into an already fragile smart energy network. Blockchain’s consensus mechanisms can enable more effective energy scheduling and allocation among different systems.

Taken together, in a smart energy system integrated with blockchain technology, users can clearly and accurately track the flow of every unit of energy—for example, one kilowatt-hour of electricity or one thousand kilojoules of heat—while the system can automatically complete energy transactions between users and carry out system-wide energy scheduling. It can also promptly adjust the energy conditions of distributed energy stations, thereby creating a more intelligent energy system and contributing to the sustainable development of human society.