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Abstract
This paper analyses the hybrid solar and pump hydroelectric power plant and its hydrological and hydro-energetic characteristics and indicators. The sustainability of the system is based on stable water and energy budget. The key theoretical relationship for solar-hydro system, between electric powers of solar generator, artificial water resources, and storage is set, including relevant formulas and indicators. Artificial rain, flow, and hydro-energy potential, as indicators of the hybrid power plant, have been derived, as well as hydro-energy production characteristics. The developed and presented hydrological and hydro-energetic indicators are information for hybrid energy system analyses and design. The proposed indicators have been applied on two different climate areas, as paradigms of Continental and Mediterranean climate, using a photovoltaic and a solar thermal generator. The obtained results prove the correctness and usefulness of the proposed indicators for hybrid energy system analysis and development.