[3] She was co-founder, alongside Laura Annie Willson and with the support of Margaret, Lady Moir, of the Electrical Association for Women, which pioneered such 'wonders', as they were described in contemporary magazines,[4][5] as the All-Electric House in Bristol in 1935.

Her chief interest was in harnessing the benefits of electrical power to emancipate women from the drudgery household chores, so that they could pursue their own ambitions outside the home.

We are coming to an age when the spiritual and higher state of life will have freer development, and this is only possible when women are liberated from soul-destroying drudgery ...

[1] After attending school in Haywards Heath, she undertook a business secretarial course in London, where she also joined the Suffragette movement.

[9] Through a contact of her mother's she took up employment with the Cochran boiler Company as a clerk and joined the Women's Social and Political Union (WSPU).

In 1924 she was approached by Mrs Mabel Lucy Matthews about an idea she had to popularise the domestic use of electricity to lighten the burden on women.

She was very enthused by the concept and persuaded Lady Katharine Parsons, then president of WES, to host a meeting to discuss it.

[9] Haslett was a member of the Women's Provisional Club for Professional and Businesswomen (founded in 1924) alongside architect Gertrude Leverkus, Eleanor Rathbone, Dr Louisa Martindale and Lady Rhondda.

She was appointed to Crawley New Town Development Corporation 1947–56[22] a member of the working group developing a master Plan for Crawley alongside Sir Thomas Penberthy Bennett, Lawrence Neal, Alwyn Sheppard Fidler, Sir Edward Gillett, Eric Walter Pasold, Alderman James Marshall and Ivy Molly Bolton.

She represented the UK government on business missions in the US, Canada and Scandinavia, and after the Second World War she took a leading role in conferences organised for women in Germany by the British and American authorities.

[17] In 1949 the BEA named one of the ships in its collier fleet Dame Caroline Haslett in honour of its first woman member.

She retired to live at the home of her sister (and biographer), Mrs Rosalind Lilian Messenger (1902-1990), at Bungay, in Suffolk, where she died from a coronary thrombosis on 4 January 1957, aged 61.

Norah Balls of the EAW read the lesson, with an addess by Lord Citrine of the Central Electricity Authority.

An exhibition about her life and work, the Caroline Haslett Memorial Project was held in April and May 2019 at the Hawth Theatre in Crawley.