From perpendicular angel knowledgebase
- When did electric power become mainstream? on The Straight Dope's bulletin board - lots of links for the UK, not a lot for the US.
- When did electricity become common in homes? on Reference.com - for the US it appears to be the 1930s in urban areas, but much later for rural areas.
- The History of Electricity: A Timeline on The Historical Archive - indicates the major events but doesn't really describe the slow crawl of things becoming mainstream.