(Adds new details on Brexit, U.S. unit)
July 20 (Reuters) - Spain's Iberdrola :
* Owner of Scottish Power says Brexit hit on net profit fully covered by derivatives and other financial instruments
* Says negative impact of Brexit due to fall of sterling to be partially offset by evolution of dollar
* Says expect 23 percent of Ebitda to be generated in sterling in 2016, 29 percent in dollars
* Says sees potential marginal impact of GDP fall in Britain on business but will be mitigated by recent efforts on energy savings
* Says 75 percent of planned investments in Britain do not have any currency risk while another 21 percent include formulas to revise prices and reduce potential impact from Brexit
* Says first half net profit of 1.46 billion euros ($1.61 billion), slightly above a Reuters forecast for 1.44 billion euros
* Says earnings before interest, taxes, depreciation and amortization (Ebitda) was 3.89 billion euros, also beating a Reuters forecast for 3.82 billion euros
* Says revenues of newly-consolidated U.S. unit Avangrid rise 39 percent, Ebitda up 36 percent
* Confirms its targets for a year-end Ebitda growth of around 5 percent and net profit growth of more than 5 percent Reuters forecast Further company coverage: ($1 = 0.9077 euros) (Reporting by Julien Toyer and Jose Elias Rodriguez; Editing by Paul Day)