Spanish renewable power and gas supplier Audax Renovables SA (<a href="https://www.bolsasymercados.es/bme-exchange/es/Mercados-y-Cotizaciones/Acciones/Mercado-Continuo/Ficha/Audax-Renovables-ES0136463017" target="_blank">BME:ADX</a>) on Thursday launched a bond buy-back programme to repurchase up to EUR 50 million (USD 54.4m) of its outstanding notes.