She was an early worker on the National AIDS Helpline and worked for Hackney Local Authority as HIV policy officer.

[8][10] She co-founded Stonewall in 1989 in direct response to Section 28 and subsequently was the policy director of the Terrence Higgins Trust.

[8] In 1991, Power was the first openly LGBT person to speak about gay rights at the United Nations in New York.

[14][15] She was for several years the Organiser for LGBT History Month at Pride Cymru and Chair of the HIV Justice Network.

She was Historical Consultant for the ground breaking Russell T Davies Channel 4 series "It's A Sin", has appeared in a number of HIV and LGBT modern history programmes and is a Founding Trustee of the Queer Britain museum.