In terms of #2

In terms of reliability, it could be argued that renewable energy devices are unlikely to play an important role in system reliability.

In another post we looked at the usefulness of the phrase in terms of as a way to introduce the main topic of a paragraph, in particular an argument paragraph, but also in IELTS Task 1 and Task 2 writing.

However, we only really need to use in terms of if we haven't already used it somewhere else in the sentence.

In the example above, the central topic would be clear to the reader even without in terms of:

It could be argued that renewable energy devices are unlikely to play an important role in system reliability.