Joul (@joulfreunde), run by Klaus Russell-Wells, a German engineer and science journalist, makes German-language explainers on energy, buildings and climate. The channel has about 54,000 subscribers, 45,000 median views and uploads roughly once a year. Sponsored integrations are estimated at $1,100 to $1,600 per video; the creator states he does not accept PR or advertising cooperations.
German-speaking science explainer audience with strong engagement on energy topics
- Median views of about 45,000 per long-form video across 17 recent uploads
- Top video reached 1.4 million views on thermostat myths, showing broad reach potential
- Engagement rate of 2.8 percent, with likes at 2.6 percent of views
Brand fit report
Content
- Formats
- explainer videos, myth-busting, Q&A follow-ups
- Tone
- analytical, accessible
- Language
- German
- On camera
- Yes, talking head
- Production
- Clean, lightly edited
- Typical length
- 8 to 12 minutes
Audience
Commercial
- Brands seen
- None yet
- Categories promoted
- None yet
- Affiliate links
- No
No sponsorship disclosures found in the last 50 videos; the channel description states the creator is not interested in PR or advertising cooperations.
Suitability GARM Brand Safety Floor + Suitability
Family friendly
Videos such as 'CO2-Preis - sinnvolle Maßnahme oder unfaire Belastung?' cover contested policy questions like carbon pricing, which may matter for political brand-safety preferences.
We classify content, never people. No age, gender, ethnicity, religion or political views are inferred about the creator. Audience figures are estimates unless marked verified. Creators can correct anything on their profile.
Platforms
Benchmark score: 61 / 100
Public rule, same for everyone. How it works.
Recent videos
▶Im Urlaub besser Heizung aus? · 48k views
▶Die Heizungen der Zukunft - ohne Erdgas weiter warm · 15k views
▶Aber wo war die Wärme vorher? Der faszinierende Mechanismus · 9.3k viewsLast three uploads, latest 271 days ago.
Hey, ich bin Klaus, Ingenieur für Energie-, Gebäude und Umwelttechnik, und Wissenschaftsjournalist. Auf diesem Kanal drehe ich Videos über technische Themen aus gesellschaftlicher Perspektive. Außerhalb dieses Kanals produziere ich mit meinem Team Wissenschaftsvideos in Zusammenarbeit mit Forschungszentren und anderen öffentlichen und Bildungseinrichtungen. Bitte habt Verständnis dafür, dass ich keine Energieberatung anbiete und auch kein Interesse an PR- und Werbekooperationen habe. Website: https://www.joul.de Instagram: https://www.instagram.com/joulfreunde/
About Joul
Joul is the German-language YouTube channel of Klaus Russell-Wells, an engineer and science communicator who explains energy, buildings and climate policy in long-form videos of roughly 8 to 12 minutes. According to his website joul.de, he works as a self-employed science communicator producing videos for research institutions and public broadcasters, alongside the channel.
The channel has about 54,000 subscribers and a median of roughly 45,000 views per video, with a few breakout uploads well above that. Uploads are infrequent, with one video in the last year. The audience is likely German-speaking adults with an interest in home heating, energy policy and climate, though this is an estimate from the content rather than measured data.
At $20 to $35 per 1,000 median views, a sponsored video would cost roughly $900 to $1,600, a CPM comparable to or above the $10 to $30 typical of paid ads. The creator states he does not accept PR or advertising cooperations, so brands should expect that to limit any offer.
Written from Joul's public YouTube profile, platform data and web mentions. Numbers updated 2026-10-19. Joul can edit or remove this page at any time.
Questions about Joul
How much does Klaus Russell-Wells charge for a sponsored video?
Based on a median of about 45,000 views, the estimated range is $900 to $1,600 per video, but the channel states the creator does not accept PR or advertising cooperations. Contact details unlock on Starbooked for $0.80.
What does Joul post about on YouTube?
Joul makes German-language explainer videos on energy, heating, climate and the energy transition, often examining myths and contested policy questions. Videos typically run 8 to 12 minutes.
How do I contact Joul for a brand deal?
Contact details unlock on Starbooked for $0.80. Joul is not a boosted creator, so it cannot be booked through Starbooked directly, and the creator has said he is not interested in advertising cooperations.
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