* Says hires UBS and Citigroup for 4.9 percent stake sale
* Citigroup says selling stake at up to 3 percent discount
* Stake is among the last of Bankia corporate share holdings (Adds confirmation, more details)
By Carlos Ruano and Tracy Rucinski
MADRID, April 9 (Reuters) - Spain's biggest state-owned lender Bankia said on Wednesday it had given UBS and Citigroup a mandate to sell its entire 4.94 percent holding in Spanish utility Iberdrola, one of its last remaining corporate stakes.
Spain's bailed-out banks such as Bankia have been among the most active sellers of industrial holdings as they slim down to comply with restructuring plans following a 2012 international rescue.
The Iberdrola stake, worth around 1.6 billion euros ($2.2 billion) at current market prices, will be sold through an accelerated book building process with UBS and Citigroup acting as joint bookrunners, Bankia said in a statement on Wednesday.
Citigroup said it was building books for the Iberdrola stake at a price range of 4.85 euros to 5.002 euros, representing up to a 3 percent discount to Wednesday's closing price.
Bankia has already sold stakes worth more than 2.4 billion euros in groups such as insurer Mapfre and IT company Indra and its stake in olive oil firm Deoleo is currently the target of a bid by CVC Capital Partners .
Shares in Iberdrola closed down 0.5 percent at 5.002 euros on Wednesday but have risen 11.47 percent so far this year as investors gained increasing clarity over the impact of a recent government overhaul of the Spanish energy sector.
Still, earnings at Iberdrola, the world's leading wind farm operator, have suffered as a result of the reforms, which include a new power generation tax and cuts on renewable energy subsidies.
Iberdrola's leading shareholder is the Qatar Investment Authority with 9.32 percent.
($1 = 0.7234 Euros) (Additional reporting by Jesus Aguado and Julien Toyer, Editing by David Evans)