No. 1,127 in Russian
электроэнергии
Electric energy.
In a sentence
В нашем городе внедряют новые технологии для экономии электроэнергии.
New technologies are being implemented in our city to save electricity.
The word "электроэнергии" is used in the genitive case to indicate the concept of "electricity" in the matters of conservation or usage.
Счёт за электроэнергию снова вырос в этом месяце.
The electricity bill increased again this month.
"Электроэнергию" here is in the accusative case, referring to "electricity" in the context of something consumed and billed for.
Производство электроэнергии стало более экологичным.
The production of electricity has become more environmentally friendly.
"Электроэнергии" is in the genitive case, describing "electricity" in the context of its generation.
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