# Green Energy

Curious about our sustainability credentials? See more here.

By Karl1 author9 articles

- [What is green electricity anyway?](https://support.ostrom.de/en/articles/7036664-what-is-green-electricity-anyway)
- [What does the TÜV Nord certification mean?](https://support.ostrom.de/en/articles/7226938-what-does-the-tuv-nord-certification-mean)
- [What does the B Corp certification mean?](https://support.ostrom.de/en/articles/7226948-what-does-the-b-corp-certification-mean)
- [Why choose green electricity?](https://support.ostrom.de/en/articles/7036673-why-choose-green-electricity)
- [Where does Ostrom get its electricity?](https://support.ostrom.de/en/articles/7036666-where-does-ostrom-get-its-electricity)
- [What are certificates of origin?](https://support.ostrom.de/en/articles/7036679-what-are-certificates-of-origin)
- [What are PPAs (Power Purchase Agreements)?](https://support.ostrom.de/en/articles/7036701-what-are-ppas-power-purchase-agreements)
- [Is Ostrom really green? Where does Ostrom's energy come from?](https://support.ostrom.de/en/articles/5457639-is-ostrom-really-green-where-does-ostrom-s-energy-come-from)
- [Is green electricity more expensive than conventional electricity?](https://support.ostrom.de/en/articles/7036711-is-green-electricity-more-expensive-than-conventional-electricity)