3.1 Financial performance Tariff increases and the renegotiated special pricing agreements (SPAs) with some smelters and some mining customers have improved Eskom's financial performance for the past two financial years (2011 and 2012). The utility had made a profit of R13, 2 billion for this financial year compared to the R8, 3 billion reported last year. The 25.8% tariff increase granted by National Energy Regulator of South Africa resulted in a 24.8% increase in revenue. Revenue for the group grew from R91 billion in 2011 to R114,7 billion in the financial year under review as a result of a combination of factors, namely the environmental levy charged to customers which contributed R4,3 billion as well as the sale of electricity that increased by 0.2%.