Curentul electric este din nou stabil.

Because -ul is the Romanian definite article attached to the end of the noun.

• curent = current
• curentul = the current

Romanian usually puts the definite article at the end of the noun, unlike English, which uses a separate word (the).

So:

• curent electric = electric current
• curentul electric = the electric current

In this sentence, the speaker is talking about a specific thing already understood from context, so curentul makes sense.

Literally, curentul electric means the electric current.

But in everyday Romanian, curent often also means electricity / electrical power supply, especially in home or utility contexts.

So depending on context, this sentence can feel like:

• The electricity is stable again
• The power supply is stable again
• literally, The electric current is stable again

If this is about household power, a native speaker will usually understand it as the electricity supply being stable again, not a physics lecture.

In Romanian, adjectives usually come after the noun.

So:

• curent electric = electric current
• literally: current electric

This is normal Romanian word order.

A few adjectives can come before the noun for emphasis or style, but the standard, neutral order here is:

• curentul electric

Yes, you often could.

• Curentul este din nou stabil = The electricity/current is stable again
• Curentul electric este din nou stabil is a bit more explicit or formal

In everyday speech, Romanians often just say curentul, especially if the situation already makes it obvious that they mean electricity.

Adding electric can sound:

• more precise
• slightly more formal
• more technical

So both are possible, depending on style and context.

Este means is. It is the 3rd person singular present form of a fi (to be).

So:

• este = is

In this sentence:

• Curentul electric = subject
• este = verb
• stabil = adjective describing the subject

So the structure is simply:

• The electric current is stable again.

Romanian normally keeps este in full standard sentences like this.

Din nou is a very common Romanian expression meaning:

• again
• anew

Literally, it is made of:

• din = from
• nou = new

But together din nou functions as a fixed phrase meaning again.

So:

• este din nou stabil = is stable again

Romanian also has iar and iarăși, which can also mean again, but din nou is very common and neutral.

Because stabil must agree with curentul electric, which is masculine singular in form.

In Romanian, adjectives agree with the noun in gender and number.

Here:

• curentul = masculine singular
• therefore stabil = masculine singular form

Compare:

• curentul este stabil = the current is stable
• situația este stabilă = the situation is stable

So stabilă would be wrong here because that form is feminine singular.

Yes. Curent is a masculine noun.

You can see this in forms like:

• indefinite singular: un curent
• definite singular: curentul

Because it is masculine singular, the adjective also appears in the masculine singular form:

• curentul electric este stabil

Because din nou naturally modifies the whole idea is stable again.

So:

• este din nou stabil = is stable again

This is the most natural order in ordinary Romanian.

You may also hear or see other placements, depending on emphasis, for example:

• Curentul electric este stabil din nou.

This is understandable, but it can sound a little less neutral in many contexts. The version with din nou before the adjective is very standard and smooth.

Yes, Romanian word order is somewhat flexible, but some versions sound more natural than others.

Standard neutral version:

• Curentul electric este din nou stabil.

Possible alternative:

• Din nou, curentul electric este stabil.

This puts more emphasis on again, as if contrasting with an earlier unstable period.

Another possible version:

• Curentul electric este stabil din nou.

This is understandable, but many speakers would prefer the original version in normal conversation.

So the original sentence is a very natural default choice.

A rough pronunciation guide is:

koo-REN-tool e-LEK-trik ES-te deen NOU sta-BEEL

A few helpful notes:

• c in curentul is like English k
• u is like oo in food
• e is usually a clear eh
• din nou has nou sounding roughly like noh-oo, but as one syllable glide
• stabil has stress on the second syllable: sta-BIL

A more careful approximation in chunks:

• Curentul → koo-REN-tool
• electric → e-LEK-trik
• este → ES-te
• din nou → deen NOU
• stabil → sta-BEEL

It is mostly neutral, with a slightly technical/formal touch because of curentul electric.

If you wanted a more everyday, conversational version, you might hear:

• Curentul e din nou stabil.

Here, e is the common spoken short form of este.

And in a very everyday home context, people might even say something like:

• S-a stabilizat curentul din nou.
• Acum curentul e stabil din nou.

But your original sentence is perfectly correct and natural, especially in written or careful spoken Romanian.