References 190% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 1 reference, the source included, supports the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

• [1]90%
  blog.google/innovation-and-ai/infrastructure-and-cloud/global-network/clean-energy-reliability-michigan

  blog.google· Posted Oct 10, 2026· Starts Mar 17, 2026 ✓· 100% of score

  Site-evaluation announcement: the source specifies this exact day. This is not an opening date.

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