En este caso, necesitamos votar.

It actually is very close word-for-word:

• en = in
• este = this
• caso = case

So En este caso is the normal Spanish equivalent of In this case.

A helpful detail: este changes form depending on the noun:

• este caso = this case
• esta situación = this situation

Here caso is masculine singular, so Spanish uses este.

Because Spanish often leaves out subject pronouns when the verb ending already makes the subject clear.

• necesitamos means we need
• The ending -amos tells you the subject is we

So:

• Necesitamos votar = We need to vote
• Nosotros necesitamos votar also works, but nosotros is usually unnecessary unless you want emphasis or contrast.

For example:

• Ellos no quieren ir, pero nosotros necesitamos votar.
  Here nosotros is used to emphasize we.

Necesitamos comes from the verb necesitar = to need.

Its parts are:

• necesit- = the verb stem
• -amos = the ending for we in the present tense

So:

• yo necesito = I need
• tú necesitas = you need
• él/ella necesita = he/she needs
• nosotros necesitamos = we need
• vosotros necesitáis = you all need
• ellos necesitan = they need

Since this is Spanish from Spain, you may especially notice vosotros necesitáis, which is commonly used there.

Because after a conjugated verb like necesitamos, Spanish often uses an infinitive for the second verb.

So the structure is:

• necesitamos votar
• literally: we need to vote

This is very common in Spanish:

• quiero comer = I want to eat
• podemos entrar = we can come in
• deben estudiar = they must study

So necesitamos votar follows a very standard pattern: conjugated verb + infinitive

Yes, absolutely. Both are natural, but they are not identical in tone.

• necesitamos votar = we need to vote
• tenemos que votar = we have to vote

A rough difference:

• necesitamos votar focuses on need or necessity
• tenemos que votar often sounds more like obligation or something required

Depending on context, they may be almost interchangeable.

Other similar options:

• hay que votar = one must vote / it’s necessary to vote
• debemos votar = we should / we ought to vote, or sometimes we must vote depending on context

Because En este caso is an introductory phrase.

In English, we often write:

• In this case, we need to vote.

Spanish often does the same:

• En este caso, necesitamos votar.

The comma helps separate the introductory phrase from the main clause. In informal writing, some people may omit it, but using the comma here is standard and clear.

Yes:

• votar = to vote
• botar = to throw away, toss, bounce, or eject, depending on context

In most of Spain, b and v are pronounced very similarly, so learners often confuse them in spelling. But they are different words.

Examples:

• Vamos a votar. = We’re going to vote.
• Voy a botar la basura. = I’m going to throw out the rubbish.

So you need to learn the spelling by meaning, not by sound alone.

A simple approximate pronunciation is:

en ES-teh KAH-soh, neh-seh-see-TAH-mohs boh-TAR

A few useful notes for Spain:

• e is usually like the e in bet, but a bit cleaner
• a is a clear ah
• o is a clear oh
• In most of Spain, c before a in caso sounds like a normal k
• votar begins with a b/v sound that is very similar in Spanish

Also, Spanish rhythm is more even than English: each syllable is pronounced more clearly.

Modern standard Spanish normally writes demonstratives like este, ese, aquel without an accent mark, even when they mean this/that one.

So:

• este caso = this case

Older spelling rules sometimes allowed éste in certain situations, but today the normal spelling is simply este.

Also, here este is an adjective modifying caso, so este caso is exactly what you want.

Yes. Caso is a flexible word and can mean different things depending on context, such as:

• case
• situation
• instance
• matter

So En este caso can often be understood as:

• in this case
• in this situation
• in this instance

That is why it is such a common expression in Spanish.

Yes, it sounds natural and correct.

En este caso, necesitamos votar. is a normal, clear sentence in standard Spanish from Spain.

Depending on context, a speaker might also choose:

• En este caso, tenemos que votar.
• Aquí necesitamos votar.
• En esta situación, necesitamos votar.

But your original sentence is perfectly natural.