This article delves into the role of digital transformation in bolstering economic security within investment processes, emphasizing the integration of environmental sustainability. It discusses theoretical perspectives and methodological approaches that illuminate how digital technologies can enhance investment practices while ensuring environmental responsibility. The authors emphasize that leveraging digital transformation can not only mitigate risks and vulnerabilities but also bolster efficiency and transparency in investment decision-making while promoting sustainable practices. Through a review of pertinent literature, the article scrutinizes the advantages of digitalization in realms such as data analytics, automation, and artificial intelligence, highlighting the dual benefits of economic security and environmental stewardship. The findings enrich the existing knowledge base on economic security and underscore the significance of embracing digital transformation infused with environmental sustainability in the investment arena. This article furnishes valuable insights for policymakers, practitioners, and researchers navigating the evolving landscape of investment processes in an increasingly digitized and environmentally conscious world.

Purpose. To substantiate an approach to road development investment management in Ukraine in compliance with the principle of syncretism and the use of Quality Function Deployment methodology, to improve the methodological approach to calculating the concession fee for brown-field and green-field road concession projects. Methodology. The study used a set of general and special methods of cognition: the Quality Function Deployment (QFD) method, the environmental approach, multimodal analysis, Decoupling Index, Decoupling Factor, logical generalization, quantitative and qualitative comparison, scientific abstraction and systematization. Findings. According to the results of research on interrelation of cost of an investment project and volumes of works by their types, an economic-mathematical model of estimation of need for investments in projects for construction, reconstruction, repair and maintenance of public motor roads is offered. The proposed model, unlike the existing ones, is based on lateral understanding of the clarity of delineation of capital needs by type of road construction, which will provide taking management decisions on investment projects with model and information tools that will help obtain the most realistic assessment of need for capital needed to improve the transport operation condition of motor roads in Ukraine. Originality. The organizational-economic mechanism of management of investment activity of road economy and the estimation of efficiency of co-financing investment projects under programs on construction, reconstruction, repair and maintenance of motor roads is advanced. The diagnostics of efficiency of investment of construction of public motor roads under public-private partnership in the form of concession is improved. Practical value. The results of the study can be used in the activities of road industry of Ukraine for the development and implementation of investment projects under motor road development programs.

Biogas production from agricultural waste reduces methane emissions and addresses climate change challenges by converting livestock and organic waste into energy. This study analyzed biogas production in agricultural enterprises under the European Green Deal, the advantages of biogas as an energy source, and the use of digestate in agriculture. The raw material for biogas production from agro-industrial wastes in Ukraine has been investigated, showing that the country’s biogas production potential amounts to 34.59 billion m³, including 0.65 billion m³ from processing plant wastes. The main types of biomass that can be used for biogas production in Ukraine are crop residues (71.4%), manure (26.6%), and food industry waste (2.0%). The implementation of biogas production projects will reduce greenhouse gas emissions by 3.98 billion tons of CO₂ and increase profits through electricity sales. This study examines the barriers and prospects for the development of electricity generation from biogas in Ukraine in the context of the integration of Ukraine’s energy system into the EU energy space. Directions for developing the biogas industry, focusing on electricity production within the framework of European decarbonization initiatives, will enhance the energy security of Ukraine and the EU. Estimating the energy production from agricultural waste allows for determining biogas output from organic waste. A regional biogas cluster model was developed based on the agro-industrial complex, which combines the production of biogas, electricity, water, and biofertilizers with increased efficiency and regional sustainable development.

The study considers approaches to ensuring energy management for the safe operation of facilities and their equipment and ways to improve it. It has been established that to ensure effective safety management of industrial enterprises, one of the critical areas is the technical diagnostics of power equipment during operation. An assessment of the actual technical condition of power equipment of VVER-1000 power units is proposed based on establishing the aging mechanisms and determining the relative evaluation coefficients for the characteristics of individual equipment elements. The results of the calculations allowed us to conclude that the obtained results correspond to the coefficients of relative assessment Ki of the technical characteristics of the power equipment that determine its degradation. Studies indicates that when assessing the state of power equipment, it is necessary to consider the presence and impact of the following operational factors that are not considered in the design calculations: loads, high levels of mechanical stress, fatigue damage, and metal defects, which primarily indicate the presence of degradation changes. To assess the technical condition of the equipment, considering the degree of mechanical wear, 17 technical characteristics were selected to determine the aging mechanisms by signs of degradation. A mathematical model of the dependence of the relative evaluation coefficient K on changes in the operating parameters is presented, and it is noted that the most significant influence on the value of the coefficient is the temperature of the coolant at the inlet (K = 0.56). The developed approach makes it possible to improve the safety management system of power facilities by introducing the proposed model to assess the technical conditions of power equipment by defining the parameters in the overall safety management system.

The article highlights three directions of stable development: economic growth, ecological management, social integration which cover all the sectors of development. Main tasks and functions are presented in the context of stable enterprise and society development. They can be carried out with the help of certain indicators and applied in different countries, regions, or industries. Approbation of the proposed mechanism was carried out at Lithuanian waste management sector and Ukrainian metallurgical enterprises. The system of stable development indicators proposed by the authors includes three groups for Lithuanian waste management industry case and five groups of them for Ukraine metallurgical enterprises. The ISI - a stability index which is used for integral assessment of industrial enterprises' developmental stability, and is based on calculating complex indicators of economic, ecological, social, risk and market stability. The mechanism of integrated assessment of enterprise stability has been improved and now allows choosing the optimal continuous monitoring method, giving enterprises an opportunity to work effectively and develop steadily for a long period of time. Developmental stability corresponds to the average level and characterizes the need to develop the dimensions for increasing the level of developmental stability of such enterprises.