An Electricity Bill

If a word begins with a vowel (aeiou), we always use the article "an" instead of "a" before it.

Today, I received my electricity bill for February was sent, and the cost was surprisingly high.

I always have a hard time with あげる and もらう in Japanese, too.

It's almost twice as higher than the pricecost of a month in the summer season.

This sounds more natural in the US.

Alternatives:
It's almost twice as high than the cost of a month during the summer.
It's almost twice as high than the cost during the summer.
It's almost twice as high than a summer month.
It's almost twice as high than the cost of a summer month.

I used an electric heater and stayed at home for a longmost of the time, so the cost is not strabill isn't surprisinge.

This sounds more natural in the US. While we can use "変" in Japanese, in US English, we don't often use it this way.

An Electricity Bill

Before a vowel put an instead of a

Today, I got my electricity bill for February was sent, and, the cost was surprisingly high.

It's almost twice higher thandouble the price of a month in the summer season.

I used an electric heater and stayed at home for a long time, so the cost is not strangea lot, so I am not surprised.