ibeon dal jeongisega manhi nawaseo eeokeoneul deol kyeoryeogo hae.

이번 달 means this month in the sense of the current month / this month’s cycle.

• 이번 = this time / this round
• 달 = month

So 이번 달 is the natural everyday way to say this month.

By contrast, 이 달 is grammatically possible, but it sounds less natural in most daily conversation when talking about calendar months. Native speakers usually prefer:

• 이번 달 = this month
• 저번 달 / 지난달 = last month
• 다음 달 = next month

Yes, 전기세 refers to the electricity bill / electricity charge.

Breakdown:

• 전기 = electricity
• 세 = tax/fee/charge

In everyday Korean, 전기세 is very common.
A slightly more formal or official-sounding term is 전기요금.

So:

• 전기세 = common spoken word
• 전기요금 = more formal, often used in bills or announcements

This is a very common Korean way of speaking. The verb 나오다 literally means to come out, but it is often used for things like:

• results coming out
• numbers appearing
• costs/bills amounting to a certain number

So 전기세가 많이 나오다 means:

• the electric bill came out high
• the electricity charge was a lot
• the bill ended up being expensive

It does not mean the bill physically came out of somewhere. It means the amount was high when calculated or received.

Examples:

• 요금이 많이 나왔어요. = The bill came out high.
• 병원비가 너무 많이 나왔어. = The hospital bill was too high.

Because 전기세 is the subject of the verb 나오다.

In 전기세가 많이 나와서:

• 전기세가 = the electric bill (subject)
• 많이 나와서 = came out a lot / was high, so...

The bill is the thing that came out high, so 가 is used.

If you used 를, it would suggest the bill is a direct object, but 나오다 does not take it that way here.

Here 많이 literally means a lot, but in context it often feels like too much or higher than expected.

So 전기세가 많이 나와서 can feel like:

• the electric bill came out a lot
• the electric bill was high
• the electric bill came out too high

The idea of complaint or inconvenience comes from context, not from 많이 alone.

-아서/-어서 connects two clauses and often means:

• because
• so
• and then

In this sentence, it expresses the reason:

• 전기세가 많이 나와서 = because the electric bill came out high
• 에어컨을 덜 켜려고 해 = I’m going to try to turn on the air conditioner less

So together:

• Because the electric bill was high, I’m going to use the air conditioner less.

This form is very common for everyday cause-and-effect statements.

덜 means less.

So:

• 에어컨을 덜 켜다 = to turn on / use the air conditioner less

Compare:

• 안 켜다 = not turn it on at all
• 덜 켜다 = turn it on less than before
• 적게 켜다 = turn it on a small amount / less, but this is less natural here

For this sentence, 덜 켜다 is the most natural choice because the speaker does not mean I won’t use it, but rather I’ll use it less.

Yes, 켜다 means to turn on a device such as:

• lights
• TV
• air conditioner
• computer

With appliances, Korean often uses 켜다 where English might say:

• turn on
• run
• use

So 에어컨을 덜 켜려고 해 literally means I’m planning to turn on the air conditioner less, but naturally it means:

• I’m going to use the AC less
• I’m going to run the AC less often

-려고 하다 means:

• to intend to
• to plan to
• to be going to
• to try to (depending on context)

So:

• 켜려고 해 = I’m planning to turn it on / I’m going to turn it on
• 덜 켜려고 해 = I’m planning to use it less

In this sentence, -려고 해 shows intention or a plan the speaker is making now.

It is softer and more personal than a firm future statement.

해 is the casual, informal ending.

Levels:

• 해 = casual, used with friends, close people, self-talk
• 해요 = polite everyday speech
• 합니다 = formal

So the sentence is in casual speech:

• 이번 달 전기세가 많이 나와서 에어컨을 덜 켜려고 해.

More polite version:

• 이번 달 전기세가 많이 나와서 에어컨을 덜 켜려고 해요.

More formal version:

• 이번 달 전기요금이 많이 나와서 에어컨을 덜 켜려고 합니다.

Because 에어컨 is the direct object of 켜다.

• 에어컨을 켜다 = to turn on the air conditioner

So in:

• 에어컨을 덜 켜려고 해

the speaker is saying they intend to turn on the air conditioner less, and 에어컨 is what receives the action.

You probably could be understood, but 에어컨을 덜 켜려고 해 sounds more natural.

Why?

• 덜 compares with a previous or expected amount: less than before / less than usual
• 적게 focuses more on a small amount

Since the idea is I used it a lot, so now I’ll use it less, 덜 fits better.

Natural:

• 에어컨을 덜 켜려고 해.

Less natural but understandable:

• 에어컨을 적게 켜려고 해.

Yes.

• 전기세가 비싸서 = because the electricity bill is expensive
• 전기세가 많이 나와서 = because the electricity bill came out high

The second one sounds more natural when talking about a bill you received or the final amount on a bill. It focuses on the amount that ended up being charged.

So:

• 비싸다 describes something as expensive
• 많이 나오다 describes the billed amount as coming out high

For utility bills, hospital bills, repair costs, etc., 많이 나오다 is very common.

Yes. Even though 켜다 is a single action (turn on), in this context 에어컨을 덜 켜려고 해 usually means a broader habit change:

• use the air conditioner less often
• run it less
• cut back on AC use

So native speakers understand it not as one single moment of turning it on less, but as a plan for the near future or for the rest of the month.

Yes, this pattern is very productive.

Examples:

• 가스비가 많이 나와서 보일러를 덜 틀려고 해.
  The gas bill was high, so I’m going to use the boiler/heater less.

• 핸드폰 요금이 많이 나와서 데이터를 덜 쓰려고 해.
  My phone bill was high, so I’m going to use less data.

• 카드값이 많이 나와서 외식을 덜 하려고 해.
  My credit card bill was high, so I’m going to eat out less.

So the overall pattern is:

[expense]이/가 많이 나와서 [something]을/를 덜 + verb + -(으)려고 해

It breaks down like this:

• 이번 달 = this month
• 전기세가 = the electric bill
• 많이 나와서 = came out high, so / because it was a lot
• 에어컨을 = the air conditioner
• 덜 = less
• 켜려고 해 = I’m planning to turn on / use

So the structure is:

[time] + [bill/expense + subject marker] + [high amount + reason] + [object] + [less] + [intend to use]

A very natural English rendering would be:

• My electricity bill was high this month, so I’m going to use the air conditioner less.