Spanish electric utility Iberdrola SA (<a href="https://www.bolsasymercados.es/bme-exchange/es/Mercados-y-Cotizaciones/Acciones/Mercado-Continuo/Ficha/Iberdrola-ES0144580Y14" target="_blank">BME:IBE</a>) has secured its largest ever loan by refinancing EUR 5.3 billion (USD 5.82bn) in existing credit into one facility following an agreement with 33 international banks, an announcement said on Thursday.