Ike ekesa bụ usoro inye ike nke na-ejikọta mmepụta ike na oriri na-edozi n'akụkụ onye ọrụ. Ọ nwere ike inye ndị ọrụ ọtụtụ ihe ike oyi, ọkụ, na ọkụ eletrik. O nwere njiri mara nke ojiji na saịtị, dị ọcha na obere carbon, mmekọrịta dị ukwuu, mgbanwe na ịrụ ọrụ nke ọma, wdg, bụ akụkụ dị mkpa na nke dị mkpa nke usoro ike ọgbara ọhụrụ. Nchekwa ike ekesa bụ ihe enyemaka dị mkpa maka sistemu ike ekesa. Sistemu nchekwa nchekwa ike ekesa nwere ebe ohere na-agbanwe agbanwe. A na-eji ha eme ihe na netwọk nkesa dị ala na nke ọkara, ikesa ike na microgrids, yana ngwa ndị ọrụ.
Nchekwa ike ekesa na-arụsi ọrụ ike na United States, Europe, Australia, Japan, na mpaghara ndị ọzọ. Na mgbakwunye na ọnụ ahịa ọkụ eletrik dị elu nke ndị ọrụ njedebe na ọnụahịa ọkụ eletrik kacha elu na ndagwurugwu, mba ndị a nwekwara usoro ọnụahịa ọkụ eletrik dị mma maka ngwa nchekwa ike. Ewebata enyemaka nchekwa nchekwa ike ekesa ma ọ bụ amụma mkpali iji kwado mmepe nke sistemu nchekwa nchekwa anyanwụ nke mpaghara ma ọ bụ sistemu nchekwa nchekwa ike ezinụlọ nọọrọ onwe ya iji nyere ndị ọrụ aka ibelata ọnụ ahịa ọkụ eletrik, mụbaa oke nke ojiji ike mmeghari ohuru, ma kwalite ogo ike ma ọ bụ ikike mgbake ọdachi.
