This is the 6962nd most frequent Korean word.
재생에너지로
"With renewable energy" or "by renewable energy."
Here, '재생에너지로' functions as a tool by which the action (producing electricity) is achieved.
재생에너지로 전기의 50%를 생산합니다.
By using renewable energy, we produce 50% of electricity.
In this sentence, '재생에너지로' indicates the means employed to resolve environmental challenges.
우리는 재생에너지로 환경 문제를 해결할 수 있습니다.
With renewable energy, we can solve environmental issues.
This usage of '재생에너지로' refers to the characteristic or nature of the systems being powered.