ForceField Energy Inc. ("ForceField") (OTCQB: FNRG), an international manufacturer, seller and distributor of energy products and solutions, today announced it signed a Letter of Intent ("LOI") with Empresa de Servicios Públicos de Heredia ("ESPH"), a utility company based in Heredia, Costa Rica, for the installation of 19,000 of its LED streetlights to replace existing lighting in ESPH's territory