US industrial packaging firm Greif Inc (<a href="https://www.nyse.com/quote/XNYS:GEF" target="_blank">NYSE:GEF</a>) has signed a virtual power purchase agreement (VPPA) with the renewable energy unit of Spanish utility Endesa SA (<a href="https://www.bolsasymercados.es/bme-exchange/es/Mercados-y-Cotizaciones/Acciones/Mercado-Continuo/Ficha/Endesa-ES0130670112" target="_blank">BME:ELE</a>) in a move that will support the construction of two solar farms in Spain.