TECHNO-ECONOMIC EVALUATON OF RETROFITTING A 210 MW THERMAL HEAVY-OIL POWER PLANT WITH A PHOTOVOLTAIC SOLAR THERMAL ENERGY STORAGE SYSTEM USING MOLTEN SALT: A CASE STUDY OF TEC NEGOTINO. etima [Internet]. 2024 Mar. 13 [cited 2025 Oct. 3];2(1):45. Available from: https://js.ugd.edu.mk/index.php/etima/article/view/6463