In recent years, the use of photovoltaic-based distributed electricity generation has played a key role in achieving climate and energy policy goals. The energy market is changing rapidly from centralized generation towards unbundling generation, transmission, distribution, and supply activities. As energy consumers also become producers, a new energy market player—the prosumer—is emerging. The role of the prosumer as a market player can be analyzed in terms of implemented technological solutions, economic assessment, environmental impact, and legal regulation requirements. The aim of this article is to investigate the importance and compatibility of energy prosumers with energy justice theory in the context of European Union (EU) law. The authors concluded first that an energy prosumer will help to meet energy justice goals only if government ensures support for generation facilities for low-income consumers, as only then can intrageneration equity be achieved. Second, seeking to ensure equality among places with different energy sources, the government should promote the development of generation facilities using different renewable energy sources. Third, the short-term electricity market, which may allow energy prosumers to participate, should be developed.

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Further increases in the number of photovoltaic installations in industry and residential buildings will require technologically and economically flexible energy storage solutions. Some countries utilize net-metering strategies, which use national networks as “virtual batteries.” Despite the financial attractiveness, net-metering faces many technological and economical challenges. It could also lead to the negative tendencies in prosumer behavior, such as a decrease in motivation for the self-consumption of photovoltaic (PV)-generated electricity. Batteries, which are installed on the prosumer’s premises, could be a solution in a particular case. However, the price for battery-based storage solutions is currently sufficiently unattractive for the average prosumer. This paper aimed to present a comparison of the economic and energy related aspects between net-metering and batteries for a single case study by considering the Lithuanian context. The net present value, degree of self-sufficiency, internal rate of return, payback time, and quantified reduction of carbon emission were calculated using a specially developed Prosumer solution simulation tool (Version 1.1, Delloite, Madrid, Spain) for both the PV and net-metering and PV and batteries cases. The received results highlight that the battery-based energy storage systems are currently not an attractive alternative in terms of price where net-metering is available; a rather radical decrease in the installation price for batteries is required.

Summary The meaning of the general principles of EU law has been broadly developed by the Court of Justice of the European Union; however, for many years it had only limited competence in deciding criminal cases. The principle of direct effect is important for ensuring the efficient functioning of EU law. The aim of this research is to find out if and how this principle affects criminal justice. To reach this objective, the researchers examine how the substance and content of the principle, through the doctrine and the judgments of Court of Justice of the European Union, can influence national criminal law and criminal procedure. Afterwards, the actual impact of EU law on national criminal law is evaluated, taking Lithuania as an example. The analysis reveals that direct application of directives in material criminal law is highly unlikely, while in criminal procedural, law such a possibility is real if EU norms are clear, unconditional, and precise.

With the enactment of the Lisbon Treaty, EU law gained supremacy over national law in ten areas of criminal law (with the possibility of extension in the future) treated as particularly serious crimes with a cross-border dimension and the right to enact directives. The question arises if and when direct effect is possible in criminal law, taking account of developments and applications of this principle in other areas of EU law. To answer this question, the following tasks are necessary: (1) to discuss the role of principles in criminal law, (2) to define the principle of direct effect through the academic literature and the jurisprudence of the CJEU, (3) to discuss whether directives could have direct effect in criminal law, and (4) to analyze the EU’s impact on Lithuanian national criminal law through an analysis of the jurisprudence of the Supreme Court of Lithuania.