This is the 1271st most frequent Polish word.
elektrowni
"Elektrowni" translates to "power plant" or "electric power station."
In this sentence, 'elektrowni' functions as the locative case of 'elektrownia', referring to the place where someone works.
Pracuję w elektrowni, która dostarcza energię do naszego miasta.
I work at a power plant that supplies energy to our city.
Here, 'elektrownię' is the accusative case of 'elektrownia', used to indicate the direct object of the action of modernization.
Władze miasta postanowiły zmodernizować starą elektrownię.
The city authorities decided to modernize the old power plant.
In this example, 'elektrownię' is in the accusative case of 'elektrownia', describing the object visible from the hill.