A tower belonging to the Abengoa solar plant is seen at the "Solucar" solar park in Sanlucar la Mayor, near the Andalusian capital of Seville, southern Spain November 25, 2015. Spain's Abengoa started insolvency proceedings on Wednesday which could lead to Spain's largest bankruptcy on record, after a potential investor said it would not inject fresh capital into the engineering and renewables company. REUTERS/Marcelo del Pozo