A ligação de energia está pronta.

Yes, ligação very often means phone call in Brazilian Portuguese. But its core idea is connection/link.

In A ligação de energia está pronta, ligação means an electrical connection, power hookup, or utility connection.

Portuguese uses the same word in different contexts, for example:

• ligação telefônica = phone connection / phone call
• ligação de água = water connection
• ligação de energia = power/electricity connection

So the context tells you which meaning is intended.

Because ligação is a feminine noun in Portuguese.

So it takes:

• a ligação = the connection
• uma ligação = a connection

That feminine gender also affects the adjective later in the sentence:

• A ligação ... está pronta
• not pronto

Because pronta agrees with ligação, which is feminine singular.

Agreement in Portuguese works like this:

• masculine singular: pronto
• feminine singular: pronta
• masculine plural: prontos
• feminine plural: prontas

Since the subject is a ligação, the correct form is pronta.

Portuguese usually uses estar for a current state or condition, and ser for a more permanent identity or essential characteristic.

Here, está pronta means is ready as a current status.

So:

• está pronta = it is ready now / it has been completed
• é pronta would sound unnatural here

This is very similar to the usual ser vs. estar distinction that learners study early on.

De energia means for electricity/power or related to electrical service.

So ligação de energia is literally something like:

• connection of power
• more natural English: power connection, electrical connection, electricity hookup

In Portuguese, de + noun is very common for this kind of classification:

• conta de luz = electricity bill
• poste de energia = power pole
• ligação de energia = power connection

Because de energia is being used in a general/classifying way, not to refer to one specific previously identified energia.

Compare:

• ligação de energia = power connection / electrical connection
• ligação da energia = the connection of the electricity

The second one could be possible in a very specific context, but it is less natural as a general label. In your sentence, de energia is the normal choice.

In many everyday utility contexts, yes.

Although energia literally means energy, Brazilians often use it to mean electricity or electrical power, especially in practical situations like bills, outages, or service connections.

For example:

• A energia acabou. = The power went out.
• A conta de energia chegou. = The electricity bill arrived.
• A ligação de energia está pronta. = The power connection is ready.

So this is very natural Brazilian Portuguese.

It is in the present tense.

• está = third person singular of estar
• pronta = adjective agreeing with the subject

So the sentence is saying the current situation now:

• The power connection is ready.

It is not a progressive form like English is being prepared. It simply describes the present state.

Yes, you could, and it would sound natural.

There is a slight nuance:

• ligação de energia emphasizes the power/electricity service connection
• ligação elétrica can sound a bit more technical, focusing on the electrical connection/wiring

In many practical contexts, both work, but ligação de energia is especially common when talking about utilities or getting electricity connected to a property.

In Brazilian Portuguese, ligação is pronounced roughly like:

• lee-gah-SOWN

A few details:

• li sounds like lee
• ga sounds like gah
• ção has the common Portuguese ending -ção, pronounced roughly sown with a nasal sound

That final -ão is nasal, which is important in Portuguese. It is not a plain English ow sound.

This is the normal and most neutral order:

• A ligação de energia está pronta.

It follows a very common pattern:

• subject + verb + adjective

You might sometimes hear emphasis changes in speech, but for standard usage, this sentence is already in the most natural order.

Usually, no, not in this sentence.

Portuguese generally uses the definite article more often than English does. Here, a ligação refers to a specific connection, so a sounds natural and expected.

• A ligação de energia está pronta. = normal
• Ligação de energia está pronta. = generally unnatural by itself

Usually it suggests that the connection is ready/finished/completed in a practical sense.

Depending on context, it could mean:

• the electrical hookup has been installed
• the utility connection process has been completed
• the property is ready to receive power

So está pronta often implies the work is done or the service setup is ready. The exact nuance depends on the real-world situation.