On 20th March 2006, the Government of Kenya (GoK) offered 30% of its shareholding in KenGen for sale to the public through an Initial Public Offer (IPO). The IPO attracted a historic 236% oversubscription.

The KenGen shares were listed on the Nairobi Stock Exchange (NSE) on 17th May 2006 and instantly revitalized the capital markets. Effective 1st August 2007, the NSE carried out a revision of  six constituent companies in the NSE 20-Share index. In recognition of KenGen's large market capitalisation and sustained tradability (liquidity), KenGen was included as an Index-linked company. The review of the Index is aimed at ensuring that it is a true barometer of the overall stock market. The last review of the Index was made in May 2003.