The article considers solar and wind energy resources and their ecological potential in the Khazar Reserve on Ogurchinsky Island in the Caspian Sea. The methodological basis is formed by the empirical calculations for the preparation of a feasibility study and the creation, development and implementation of energy-efficient technologies based on solar-wind energy equipment in the Reserve. The paper provides an energy, economic and ecological assessment of a solar power station with a capacity of 10 kW·h/day based on theoretical and methodological calculations and taking into account natural and climatic conditions. The station generates electricity (3658.34 kWh/year), saves organic fuel (1463.336 kg of equivalent fuel) and reduces harmful emissions into the biosphere: SO₂ (30.41 kg), NOₓ (16.38 kg), CO (2.13 kg), CH₄ (4.47 kg), CO₂ (2339.64 kg), solids (3.19 kg). One 400 W wind turbine can generate 19.45 kW·h/m²·year, or an average of 1.62 kW·h/m²·month, with an equivalent reduction in fuel consumption of 7.78 equivalent fuel. The obtained scientifically substantiated results will contribute to the improvement of social, living, economic and environmental conditions of the island's inhabitants, the conservation of bioresources, and strengthening energy and environmental security. The results of the feasibility study will help implement various solar-wind technological complexes in the region.