When datacenters lose power, generators should kick in. That didn’t happen for Google in London
Claim-checked. Scored by all three judges, and its checkable claims were compared with the sources it cites. How far stories are checked
Google's November 4 status-page update explains the October 20 outage in its europe-west-2-b zone in London, which disrupted Lloyds, HSBC, Royal Mail and Revolut, according to The Register. A utility cable feeding primary feeder A failed while feeder B's breaker was open for repairs after a generator test. The UPSes held, but Google says a voltage-sensing design flaw and PLC misconfiguration kept the generators from starting. The account is Google's own. The lesson for operators is that redundancy gives little protection during maintenance windows when it is reduced.
Why it ranked
No. 21 of 109 with a score of 0.63. The panel rated it highest on new information (0.89) and reader interest (0.75), lowest on practical relevance (0.59). Placed No. 21, No. 47 by score alone: the placement terms moved other stories past it.
- AI judgeJudge 2claude-haiku-5-5
- Detailed incident post-mortem from a major cloud provider on a real outage affecting banks and services; relevant to infrastructure builders, with specifics on redundancy design failure, though the excerpt is partial.
- AI judgeJudge 3gpt-5.6-luna
- A major cloud reliability incident affecting prominent services, with concrete power architecture, feeder state, testing, UPS behavior, and an identified misconfiguration. The excerpt is incomplete but already provides substantial operational detail and timely new information.
Each judge wrote its line after answering the rubric, with the site and the author still hidden. Every answer behind this is in the table under Score.
Score
0.63total under rubric v2.3
- Significance0.61
- Reader interest0.75
- Audience breadth0.62
- Practical relevance0.59
- Substantiated0.70
- Technical depth0.60
- New information0.89
- Counts against: Promotional0.05
- Counts against: Overclaim0.19
Each judge’s answer per question (0–1), their mean and spread, and what the question adds to the score (weight × mean).
| Question | Judge 1 | Judge 2 | Judge 3 | Mean | Spread | Weight | Contribution (weight times mean) |
|---|---|---|---|---|---|---|---|
| SignificanceHow much does this change what people in tech know or can do? | 0.56 | 0.55 | 0.72 | 0.61 | 0.17 | +0.24 | +0.147 |
| Reader interestWould a well-informed senior engineer or tech founder want to read this today, and likely pass it on? | 0.56 | 0.80 | 0.90 | 0.75 | 0.34 | +0.26 | +0.196 |
| Audience breadthHow many people who build technology does it concern? | 0.58 | 0.67 | 0.62 | 0.62 | 0.09 | +0.13 | +0.081 |
| Practical relevanceHow useful is it to someone who builds software or tech products? | 0.46 | 0.60 | 0.70 | 0.59 | 0.24 | +0.22 | +0.129 |
| SubstantiatedHow well is it backed? Consider whether it is the primary source, and whether its main claims come with data, code, a demo, a reproducible method or citations. | 0.59 | 0.70 | 0.80 | 0.70 | 0.21 | +0.05 | +0.035 |
| Technical depthHow technically substantive is it? | 0.69 | 0.45 | 0.66 | 0.60 | 0.24 | +0.05 | +0.030 |
| New informationDoes it contain information absent from the stories covered in the last 7 days (list provided)? | 0.88 | 0.85 | 0.95 | 0.89 | 0.10 | +0.05 | +0.045 |
| PromotionalIs it mainly marketing with little substance (a press release, ad or sponsored post with no real information)? A launch post that carries real news is not promotional. | 0.09 | 0.03 | 0.02 | 0.05 | 0.07 | −0.19 | −0.009 |
| OverclaimDo the headline or conclusions claim more than the body supports? | 0.35 | 0.10 | 0.12 | 0.19 | 0.25 | −0.11 | −0.021 |
| Sum of contributions | +0.632 | ||||||
| Claim-check penalty | 0.000 | ||||||
| Total, as published | 0.632 | ||||||
Spread is the highest minus the lowest judge answer. marks a spread above 0.40: the judges disagree, and the story is marked contested.
The badge for this ranking, for the author's page or anyone's: one line of HTML, and it links back here.
<a href="https://rubric.hrih.si/editions/2026-11-06/21/"><img src="https://rubric.hrih.si/badge/2026-11-06/21.svg" alt="Ranked #21 on Rubric, 6 Nov 2026" width="238" height="28"></a>Claim check
Claim check: 7 no source given. Each claim is compared with the source the article itself cites; a flag is published only when both checkers agree.
No source givenCausal conclusion
Google Cloud says the October 20 outage in its europe-west-2-b availability zone was caused by a misconfiguration that meant its emergency generators did not start.
The article gives no link or citation for it.
The article says “the cause of the October 20 outage in its europe-west-2-b availability zone was a ‘misconfiguration’ of its systems that meant its emergency generators didn’t start”
The source says No source to compare with.
No source givenNumber
The outage at Google's London facility caused service interruptions at Lloyds, HSBC, Royal Mail, and Revolut.
The article gives no link or citation for it.
The article says “The outage at the London facility caused service interruptions at outfits including Lloyds, HSBC, Royal Mail, and Revolut”
The source says No source to compare with.
No source givenQuote
Google's November 4 status page update said the site uses a 2N utility power architecture backed by a central high-voltage generator bank managed by a dual-redundant PLC.
The article gives no link or citation for it.
The article says “The site relies on a 2N utility power architecture — where the facility has complete duplicate power paths for every critical load — backed by a central high-voltage generator bank…”
The source says No source to compare with.
No source givenCausal conclusion
Google says the root cause was failure of an external underground cable from its power supplier, connected to primary feeder A.
The article gives no link or citation for it.
The article says “Google says the root cause of the incident was failure in an external underground cable through which its power supplier brings ‘leccy to its bit barns”
The source says No source to compare with.
No source givenDate
Feeder B's circuit breaker had been physically opened for repairs after issues found in a quarterly generator load test on 14 Oct 2026, so feed A carried the whole critical load.
The article gives no link or citation for it.
The article says “Circuit breaker feeder B was physically opened to allow for corrective repairs following issues identified during a quarterly generator load test on 14 Oct 2026”
The source says No source to compare with.
No source givenNumber
Google says europe-west-2-b uses UPSes that can keep the zone running for five minutes if it loses its grid connection.
The article gives no link or citation for it.
The article says “europe-west-2-b employs UPSes that Google says can keep things up and running for five minutes if the availability zone loses its connection to the grid”
The source says No source to compare with.
No source givenCausal conclusion
Google says a voltage-sensing design flaw and PLC misconfiguration prevented the facility's generators from starting, although the UPSes worked.
The article gives no link or citation for it.
The article says “The UPSes worked, but a “voltage-sensing design flaw and PLC misconfiguration prevented the facility’s”
The source says No source to compare with.
Also covered by
No other coverage was clustered with this story.
Elsewhere
Elsewhere: HN —
Recorded for context only, checked 6 Nov 2026, 05:47 UTC. It played no part in the ranking.