The debt has accumulated since retired President Daniel Moi's tenure.
The Court of Appeal granted orders to allow the party's offices in Nakuru county to be auctioned off to recover the electricity bill debt owed to Kenya Power.
KANU allegedly accumulated the debt while it resided at the Kenyatta International Convention Centre (KICC) during retired President Daniel Moi's tenure.
How Debt Accumulated
KANU had only been a resident at the KICC for eight years when the debt accumulated.
According to Kenya Power, the KANU team only paid up installments of Sh200,000 and Sh300,000 against its monthly expenditure of Sh3 million consumption.
At the time of moving out of KICC, KANU only had arrears of Sh212 million, however, the amount rose to the Sh700M mark due to interests accrued over time.
Kenya Power lawyer Kenneth Fraser argued that the debt has continued to rise adding that the electricity provider continues to spend more money in the elongated court case trying to recover the debt.
The auction orders were given by Court of Appeal Judges Philip Waki, Patrick Kiage and Fatuma Sichale.