Small green energy projects are considered an important tool to help poor people achieve sustainable development goals. However, green projects' economic results do not always compete with the traditional energy business. The main reason is the imperfection of the existing renewable energy technologies and the comparatively high energy generation cost with their help. The example of Ukraine, which significantly depends on fossil fuel import and develops renewable energy with state support, shows that green energy competitiveness problems exist within the overall energy market, i.e., convenient energy technologies. The key barriers to increasing the competitiveness of small green energy projects are the lack of available financial resources, the inconsistency of state energy policy, energy pricing gaps, etc. These factors significantly inhibit the spread of green energy technologies in the domestic economy. The competitiveness assessment of the renewable energy business model on the example of a private rooftop solar photovoltaic power plant has proved that green energy generation is available to every household and small business owner and is economically profitable due to existing government support mechanisms. Today, there is no competition in the Ukrainian renewable energy market, so creating a business in this field is relevant. In the long run, competitive green energy projects will provide reasonable electricity prices for consumers and profits for energy producers and stimulate the energy sector's decarbonization. Further directions for improving public policy in the green energy industry are continuing energy pricing reforms, expanding energy efficiency programs focusing on demand management, creating new jobs, and increasing investment in renewable energy sources to ensure energy security and greenhouse gas emission reduction.

This article summarizes the concept of sharing, bibliographic analysis of publications in the field of car-sharing based on the Scopus database. The primary purpose of the study is to study the economic and legal basis for the development of car-sharing business models in Ukraine. Systematization of literature sources and approaches devoted to the economic efficiency of the implementation of car-sharing business models has shown that in Ukraine, this issue is almost not paid attention to in the economic, scientific sphere, and legal, scientific areas. The urgency of solving this scientific problem lies in the need and ability to relieve road traffic from traffic jams, reducing the average downtime of vehicles, as well as economic benefits for entities (vehicle owners and passengers) involved in sharing business models. The research has the following logical sequence: the types of car-sharing business models were analyzed, and their comparative characteristics were carried out; the economic and legal preconditions of car-sharing business development in Ukraine are investigated. The research identifies legislative obstacles to the establishment of a car-sharing company in Ukraine. A SWOT analysis of the conditions for implementing a car-sharing business model in Ukraine was performed. It analyses the costs and efficiency of creating a business based on a car-sharing business model in Ukraine on a conditional example. We propose to use system-structural and comparative analysis to analyze the problems of modern transport, methods of formal-logical analysis for determining the directions of development of car-sharing business models, and economic method for assessing the effect and a payback period of the proposed project car-sharing business model. The study results can be useful for the development of the car-sharing business in Ukraine, for entrepreneurs, scientists, and vehicle owners. Keywords: car-sharing, car-sharing business model, car-sharing business, motor transport, hire, expenses, analysis.