Fastprisen for kilowattimen er den samme hele året.

Because Norwegian very often makes compound nouns as a single word.

• fastpris = fixed price
• fastprisen = the fixed price

So:

• fast = fixed
• pris = price
• -en = the definite ending for many singular nouns

English usually writes this as two words, but Norwegian commonly joins them.

It marks the noun as definite singular: the.

So:

• en fastpris = a fixed price
• fastprisen = the fixed price

Norwegian often adds definiteness to the end of the noun instead of using a separate word like the.

Kilowattimen is the definite singular form of kilowattime.

• en kilowattime = a kilowatt-hour
• kilowattimen = the kilowatt-hour

In this sentence, Norwegian uses the definite form because it is talking about the unit being priced: the price for the kilowatt-hour / the price per kilowatt-hour.

This kind of definite form is very common in Norwegian with measurements and units in this type of expression.

It means kilowatt-hour.

So:

• kilowatt = kilowatt
• kilowattime = kilowatt-hour

That is the unit of energy usually written as kWh.

Here for means something like for or per in English.

So prisen for kilowattimen means:

• the price for the kilowatt-hour
• or more naturally in English, the price per kilowatt-hour

Norwegian often uses for in this kind of pricing expression.

Den samme means the same.

In the sentence:

• er den samme = is the same

It refers back to fastprisen, which is a singular noun of common gender, so Norwegian uses den.

Compare:

• Prisen er den samme. = The price is the same.
• Huset er det samme. = The house is the same.

So den/det changes depending on the gender of the noun.

Because Norwegian often uses den/det/de samme when it means the same as a complete phrase.

So:

• den samme = the same
• det samme = the same
• de samme = the same (plural)

In this sentence, den samme works as the complement after er:

• Fastprisen ... er den samme = The fixed price ... is the same

Just samme by itself is possible in some contexts, but den samme is the standard full expression here.

Because fastprisen is a common-gender singular noun.

In Norwegian:

• common gender singular → den
• neuter singular → det
• plural → de

Since pris is common gender (en pris), we get:

• Fastprisen er den samme.

If the noun were neuter, you would use det samme instead.

Literally, it means the whole year.

• hele = whole / entire
• året = the year

Together, hele året means:

• all year
• the whole year
• throughout the year

So in this sentence it means the price does not change during the year.

Because hele året is the normal idiomatic expression for the whole year / all year long.

Norwegian often uses hele + definite noun in expressions like this:

• hele dagen = the whole day
• hele uka = the whole week
• hele året = the whole year

So this is a very natural pattern to learn as a set phrase.

The sentence follows a very normal Norwegian pattern:

Fastprisen for kilowattimen | er | den samme | hele året
subject | verb | complement | time expression

So:

• Fastprisen for kilowattimen = subject
• er = is
• den samme = complement
• hele året = adverbial of time

This is very similar to English word order.

Yes.

• å være = to be
• er = is / are / am

So here:

• Fastprisen ... er den samme = The fixed price ... is the same

Not perfectly. A very close literal version would be:

• The fixed price for the kilowatt-hour is the same the whole year.

But more natural English would usually be:

• The fixed price per kilowatt-hour is the same all year.
• The fixed price for each kilowatt-hour stays the same throughout the year.

So the Norwegian structure is straightforward, but the most natural English wording may shift a little.

No. Here it means throughout the year or all year long, not every year.

So the idea is:

• during one year, from beginning to end, the price stays the same

If you wanted every year, that would be a different expression.

The main thing to know is the grammatical gender and the definite forms:

• en pris → prisen
• en fastpris → fastprisen
• en kilowattime → kilowattimen
• et år → året

This helps explain why the sentence contains:

• fastprisen
• kilowattimen
• året
• den samme (because pris is common gender)

Norwegian does not use cases the way German does, so gender and definite endings are usually the more important things to notice here.