negative coe  


 Hi; I need a help. For my thesis,  economical and emission analysis for meeting the electricity demand of a randomly selected house which has renewable energy sources was carried out . Grid-connected PV modules, wind turbines and hybrid systems were designed to meet the domestic electricity needs. Especiaaly in hybrid systems, I saw the negative coe, npc, operating cost values as below. Is it normal, acceptable? I need a meaningful answer.


Thanks so much:))






Operating Cost



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