Bili ya umeme ina kosa la bili.

Ya is a linking word that often corresponds to of in English.

So bili ya umeme is literally bill of electricity, which English expresses as electricity bill.

A useful pattern is:

• noun + linker + noun

For example:

• bili ya umeme = electricity bill
• chupa ya maji = bottle of water
• soko la samaki = fish market

In this sentence, ya links bili and umeme.

Ina means it has.

In Swahili, possession is often expressed with a subject agreement prefix plus -na. So:

• ina = it has
• more literally, something like it is with

In this sentence:

• Bili ya umeme ina kosa la bili.
• The electricity bill has a billing error.

So ina is the part that gives the idea of has.

Because Swahili verbs agree with the subject noun.

The subject here is bili ya umeme, and the head noun is bili. That noun takes the agreement pattern that gives i-, so i- + na = ina.

Compare:

• mtu ana... = a person has...
• kitabu kina... = a book has...
• bili ina... = a bill has...

English uses has for all of these, but Swahili changes the verb form to match the noun class of the subject.

Both la and ya are forms of the same basic connector -a, but they change to agree with the noun that comes before them.

• bili ya umeme: the head noun is bili, so the connector is ya
• kosa la bili: the head noun is kosa, so the connector is la

This is an important Swahili pattern: the connector agrees with the first noun, not the second one.

So:

• bili ya umeme = electricity bill
• kosa la bili = billing error / bill error

The two instances of bili are doing different jobs.

• The first bili is the actual bill: bili ya umeme = electricity bill
• The second bili appears inside kosa la bili, which means a billing error or bill-related error

English often uses an adjective-like form such as billing, but Swahili commonly uses a noun phrase instead:

• kosa la bili = error of billing / billing error

So the repetition may feel a little heavy to an English speaker, but it is structurally normal.

Swahili does not have articles like English a, an, and the.

That means a sentence like this can be understood from context:

• Bili ya umeme ina kosa la bili.

Depending on the situation, this could mean:

• The electricity bill has a billing error
• An electricity bill has a billing error
• Electricity bill has a billing error in a more literal gloss

Usually, context tells you whether the meaning is definite or indefinite.

In Swahili, the main noun usually comes first, and the describing noun follows it with a linker.

So the structure is:

• main noun + linker + describing noun

That is why you get:

• bili ya umeme = electricity bill
• literally bill of electricity

This is very common in Swahili. For example:

• mlango wa nyumba = door of the house
• kikombe cha chai = cup of tea
• soko la matunda = fruit market

English often puts the describing noun first, but Swahili usually puts the main noun first.

The sentence is understandable and grammatically useful, but there are other ways a speaker might say something similar.

For example:

• Kuna kosa kwenye bili ya umeme. = There is an error on the electricity bill.
• Bili ya umeme ina hitilafu. = The electricity bill has an error / problem.

The given sentence is especially helpful for learning because it clearly shows:

• the ya construction
• the ina possession pattern
• the la construction in kosa la bili

So even if another phrasing may sound more natural in some situations, this one is still a good learning example.

A possible plural version is:

• Bili za umeme zina makosa ya bili.

This means The electricity bills have billing errors.

Notice the agreement changes:

• ya becomes za in bili za umeme
• ina becomes zina
• kosa becomes makosa
• la becomes ya in makosa ya bili

This is a good example of how several parts of a Swahili sentence change together to match singular or plural noun classes.

Bili is a loanword, ultimately from English bill.

That is very common in Swahili, especially for modern administrative, technical, or commercial vocabulary. Even though it is borrowed, it still behaves like a normal Swahili noun in the sentence, so it takes Swahili-style agreement:

• bili ya umeme
• bili ina...
• bili za umeme
• bili zina...

So learners should treat it as a real working part of Swahili grammar, not just as an imported English word.