Spanish 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 signed a long-term power purchase agreement (PPA) with supermarket chain Mercadona for more than 300 MW of wind and solar energy capacity, a press release said on Wednesday.