Learn Icelandic: Þessi endurnýjanlegi orkugjafi kemur til með að hjálpa okkur. - This renewable energy source is going to help us.

This phrase translates literally to comes to with to but functions as a fixed structure meaning is going to or will. It is specifically used to predict future events or outcomes. The verb koma is conjugated to match the singular subject, becoming kemur, and is followed by the fixed words til með að, and then the infinitive verb hjálpa.

Why does the adjective endurnýjanlegi end in -i rather than the standard masculine ending -ur?

Because it comes directly after the demonstrative pronoun þessi (this). Words like þessi force the following adjective into its weak form. For a masculine singular noun like orkugjafi, the weak nominative adjective ending is -i, making it endurnýjanlegi instead of the strong form endurnýjanlegur.

What case is the pronoun okkur (us) in, and why?

It is in the dative case. The verb hjálpa (to help) always requires its object to be in the dative. Even though hjálpa is in its infinitive form here because of the future structure, it still controls the case of the pronoun that follows it.

How is the compound word orkugjafi (energy source) formed?