Sähköverkko toimii hyvin.

Yes. Sähköverkko is a compound noun:

• sähkö = electricity
• verkko = network, grid, net

So sähköverkko literally means electricity network, i.e. power grid or electrical grid.

Compound nouns are very common in Finnish, and they are usually written as one word.

Toimii is the 3rd person singular present tense form of the verb toimia.

Conjugation:

• minä toimin = I function / I work
• sinä toimit = you function / you work
• hän/se toimii = he/she/it functions / works

Since sähköverkko is a singular thing, Finnish uses the he/she/it form:

• Sähköverkko toimii = The power grid works / is functioning

The form toimi can mean different things in other contexts, for example as an imperative or as part of another tense structure, but it is not the correct present-tense form here.

Here toimia means something like:

• to function
• to work
• to operate

So Sähköverkko toimii hyvin means the grid is functioning well.

This verb is often used for systems, machines, plans, services, and arrangements:

• Kone toimii. = The machine works.
• Suunnitelma toimii. = The plan works.
• Palvelu toimii hyvin. = The service works well.

Hyvin is an adverb meaning well.

So:

• toimii = works / functions
• toimii hyvin = works well / functions well

It modifies the verb, not the noun. In other words, it tells you how the power grid works.

Finnish does not have articles like a or the.

So sähköverkko can mean:

• a power grid
• the power grid

The exact meaning depends on context.

In English you have to choose between a and the, but Finnish usually leaves that unstated unless something else in the sentence makes it specific.

It is in the nominative case, which is the basic dictionary form.

That makes sense because sähköverkko is the subject of the sentence:

• Sähköverkko = the thing doing the functioning
• toimii = functions
• hyvin = well

So this is a very basic Finnish sentence pattern:

subject + verb + adverb

Yes, Finnish word order is more flexible than English word order.

The neutral order is:

• Sähköverkko toimii hyvin.

But you could also hear:

• Hyvin toimii sähköverkko.

That version gives a different emphasis, roughly highlighting well first. It may sound more stylistic or context-driven.

For learners, the safest and most natural default is the original order:

• Sähköverkko toimii hyvin.

It is singular.

If you wanted the plural, it would be:

• sähköverkot = power grids

Then the verb would also change to plural:

• Sähköverkot toimivat hyvin. = The power grids work well.

So in Finnish, the subject and verb agree in number.

A rough pronunciation guide:

• sähköverkko ≈ SAEH-kur-vehrk-ko
• toimii ≈ TOY-mee
• hyvin ≈ HUU-vin or HYY-vin depending on how closely you try to match Finnish y

A few useful pronunciation points:

• ä is different from English a; it is more like the vowel in cat for many speakers.
• ö is like the vowel in French deux or German schön if you know those.
• y is not like English y; it is a vowel, similar to German ü or French u.
• Double vowels and double consonants matter:
  • toimii has a long ii
  • verkko has a double kk

Finnish pronunciation is usually very regular, so once you know the sounds, reading is quite predictable.

Because Finnish usually does not need a separate subject pronoun when the noun itself is already there.

In English, you might say:

• The power grid works well.

You would only use it if you were referring back to the noun:

• The power grid is stable. It works well.

Finnish works the same way in that respect:

• Sähköverkko on vakaa. Se toimii hyvin. = The power grid is stable. It works well.

In the original sentence, sähköverkko already names the subject, so no pronoun is needed.

You would use the Finnish negative verb:

• Sähköverkko ei toimi hyvin. = The power grid does not work well.

Breakdown:

• ei = negative auxiliary for he/she/it
• toimi = the main verb in its negative form

Notice the difference:

• positive: toimii
• negative: ei toimi

This is a very common Finnish pattern:

• Kone toimii. = The machine works.
• Kone ei toimi. = The machine does not work.