Elprisen står i fastprisaftalen.

In Danish, the definite article is often attached to the end of the noun instead of being a separate word.

So:

• elpris = electricity price
• elprisen = the electricity price

And:

• aftale = agreement
• aftalen = the agreement

That is why Danish does not need a separate word like English the here.

Elprisen is made of:

• el = electricity / electric power
• pris = price
• -en = the definite ending for a common-gender singular noun

So the structure is:

• el + pris + en → elprisen

Danish very often builds longer nouns this way by combining smaller words into one compound noun.

Yes, står is the present tense of stå, which literally means stand.

But in Danish, stå is also often used idiomatically about written information. In that use, it can mean things like:

• is written
• is stated
• appears
• is listed

So in this sentence, står does not mean that the electricity price is physically standing somewhere. It means the information is written in the agreement.

This is a very common Danish usage.

Here, i means in, and it is natural because the information is understood as being contained within the agreement.

So:

• står i aftalen = is stated in the agreement

Danish often uses i with documents, contracts, laws, and texts when something is included in their content.

You may sometimes see på with things like:

• på siden = on the page
• på hjemmesiden = on the website

But with aftalen, i is the normal choice here.

Fastprisaftalen is another compound noun. It is built from:

• fast pris = fixed price
• aftale = agreement
• -n = the definite ending

More exactly:

• fastpris = fixed price
• fastprisaftale = fixed-price agreement
• fastprisaftalen = the fixed-price agreement

Danish loves long compound nouns, and they are written as one word.

Because Danish usually writes compound nouns as one word.

So where English might write:

• fixed-price agreement

Danish normally combines the noun elements into one word:

• fastprisaftale

This is one of the most important spelling habits in Danish. Native English speakers often want to separate the words too much, but Danish generally prefers one compound noun.

Danish main clauses usually follow the V2 rule, which means the finite verb normally comes in the second position.

In this sentence:

• Elprisen = first element
• står = second element

So the sentence follows normal Danish word order.

This is similar to standard English in simple sentences, but Danish keeps this verb-second pattern even in many cases where English would not.

You could say it, and people would probably understand you, but it is not as natural if you specifically mean that the price is written or stated there.

• er i = is in
• står i = is written/stated in

So står i is better when you are talking about information appearing in a document.

Compare:

• Nøglen er i tasken = The key is in the bag
• Prisen står i aftalen = The price is stated in the agreement

Because Danish often expresses that idea more simply, using stå in an idiomatic way.

English may need a passive-style expression such as:

• is stated
• is written
• is listed

But Danish can often just use:

• står

So Danish is not literally matching English word for word here. It is using its own natural expression.

Står is present tense.

The present tense is used because the sentence states a current fact about what the agreement says. Danish often uses the present tense this way for general or ongoing facts.

So the sentence is not about an action happening right now in a dramatic sense. It simply describes what the agreement currently contains.

Yes, it matters.

Both pris and aftale are common-gender nouns, so their singular definite form takes the ending -en or -n:

• pris → prisen
• aftale → aftalen

With aftale, the word already ends in -e, so the definite form is just -n added:

• aftale + n = aftalen

This is very common in Danish noun inflection.