Согласно почасовому тарифу, док-станция бесплатна.

Because согласно in this meaning takes the dative case.

So:

• тариф → тарифу (dative singular)
• почасовой → почасовому (dative singular masculine, matching тарифу)

A learner often wants to translate word-for-word from English according to, but in Russian the important thing is to remember the pattern:

• согласно + dative

For example:

• согласно плану = according to the plan
• согласно закону = according to the law
• согласно расписанию = according to the schedule

Here согласно means according to or in accordance with.

So Согласно почасовому тарифу means something like:

• According to the hourly rate
• Under the hourly pricing
• In accordance with the hourly tariff

It is a fairly formal or neutral way to refer to a rule, pricing system, document, policy, or schedule.

Literally, it means to the hourly tariff/rate in grammatical form, but in natural English it means according to the hourly rate or under the hourly pricing.

Breakdown:

• час = hour
• почасовой = hourly / by the hour
• тариф = tariff, rate, pricing plan

So почасовой тариф is an hourly rate or hourly pricing scheme.

The form почасовому тарифу is just that phrase in the dative singular because of согласно.

Yes. док-станция is a borrowed modern term, from English dock station / docking station.

A few useful things to notice:

• it is written with a hyphen
• it is feminine
• its nominative singular form is док-станция

Because it is the subject of the sentence, it stays in the nominative case here.

So:

• док-станция = docking station
• док-станция бесплатна = the docking station is free

Because бесплатна is the short-form adjective, and short forms are very commonly used in Russian when the adjective is the main predicate of the sentence.

Here:

• док-станция is feminine singular
• so the short form is бесплатна

Compare:

• бесплатный = masculine short/full dictionary base adjective
• бесплатная = full feminine form
• бесплатна = short feminine form

In this sentence, бесплатна means is free.

A very useful pattern:

• Он готов. = He is ready.
• Она готова. = She is ready.
• Место занято. = The place is occupied.
• Док-станция бесплатна. = The docking station is free.

You can sometimes hear бесплатная in predicate position in speech, but бесплатна is the more specifically grammatical predicate-style form here.

Because in the present tense, Russian normally omits the verb to be.

So where English says:

• The docking station is free

Russian simply says:

• Док-станция бесплатна

This is completely normal.

Compare:

• Он студент. = He is a student.
• Она дома. = She is at home.
• Книга интересная. = The book is interesting.
• Док-станция бесплатна. = The docking station is free.

If you were talking about the past or future, Russian would use forms of быть:

• Док-станция была бесплатной. = The docking station was free.
• Док-станция будет бесплатной. = The docking station will be free.

Because it is the subject of the sentence — the thing being described.

The sentence structure is basically:

• [According to the hourly rate], [the docking station] [is free].

So:

• док-станция = subject → nominative
• бесплатна agrees with it in feminine singular

That agreement is why you get:

• док-станция бесплатна and not
• док-станция бесплатен or бесплатно

It is best understood as a comma that sets off the opening phrase for clarity and pause, but with a phrase like согласно почасовому тарифу the comma is not always strictly required in every context.

So you may see both:

• Согласно почасовому тарифу, док-станция бесплатна.
• Согласно почасовому тарифу док-станция бесплатна.

The version with the comma makes the introductory phrase feel more clearly separated and often sounds more natural in formal writing.

For a learner, the safest takeaway is:

• the comma here is possible and common
• it helps mark the opening according to... phrase

Yes. Russian word order is flexible, and changing it changes the focus or emphasis, not the basic meaning.

For example:

• Согласно почасовому тарифу, док-станция бесплатна.
  Neutral/formal: according to the hourly rate, the docking station is free.

• Док-станция бесплатна согласно почасовому тарифу.
  Puts the main statement first: the docking station is free, according to the hourly rate.

The original version sounds natural if you want to begin with the basis or rule behind the statement.

Sometimes yes, but the nuance changes.

For example:

• По почасовому тарифу док-станция бесплатна.

This can also mean something like under the hourly rate / according to the hourly pricing, and it may sound a bit more idiomatic in some practical contexts like pricing, plans, or service terms.

But согласно is more explicitly according to / in accordance with, and it sounds more formal or document-like.

So:

• согласно = according to, in accordance with
• по = under, by, according to, depending on context

Both can work, but they are not always identical in tone.

You can tell from the feminine singular ending.

• док-станция is feminine singular
• the short adjective therefore must also be feminine singular
• so the correct form is бесплатна

Compare the short-form paradigm:

• бесплатен = masculine
• бесплатна = feminine
• бесплатно = neuter
• бесплатны = plural

Examples:

• Вход бесплатен. = Admission is free.
• Доставка бесплатна. = Delivery is free.
• Обслуживание бесплатно. = Service is free.
• Все напитки бесплатны. = All drinks are free.

This is a very useful pattern to learn, because short-form adjectives often appear in exactly this kind of sentence.