Yahweh is the creator (Isa 45:7-45:8)

“I form light.

I create darkness.

I make well being.

I create woe.

I am Yahweh.

I do all these things.

Shower!

O heavens!

From above!

Let the skies rain down righteousness!

Let the earth open!

Thus salvation may spring up.

Let it cause righteousness

To spring up also!

I!

Yahweh!

Have created it.”

Yahweh, in the first person singular, maintains his creative power here in Second Isaiah. He has created light and darkness. He has created good things and bad things. He is Yahweh. He sends showers and rain upon the righteous ones. He wants the earth to open up and let salvation spring forth. The righteous ones should flourish because Yahweh has created all things.

The power of God (Ps 74:12-74:17)

“Yet God!

My King is from of old.

He is working salvation in the earth.

You divided the sea by your might.

You broke the heads of the dragons in the waters.

You crushed the heads of Leviathan.

You gave him as food

For the creatures of the wilderness.

You cut openings for springs and torrents.

You dried up ever-flowing streams.

Yours is the day.

Yours also is the night.

You have established the luminaries.

You have established the sun.

You have fixed all the bounds of the earth.

You have made summer and winter.”

This is a prayer to God about his creative power. God had been an old fashioned king for a long time. He brought salvation to the earth. He divided the seas to produce the earth. He had to defeat the sea monsters, particularly the mythical Leviathan, the great beast that was so important in Job, chapter 41. However, God was able to defeat Leviathan and feed his body to the wild animals. God definitely controlled the water ways, big and small. He was in charge of day and night as well as all the heavenly lights, including the sun. He set up the boundaries of the earth. He had control of the seasons of the year with its various climate changes of summer and winter. God was the powerful creator of heaven and earth as well as the water and the land.