For years, Eskom has been unhappy with the way the Energy Regulator has been applying the methodology used for calculating the State-owned utility’s allowable revenue. This calculation is highly contested by various stakeholders, as it is used to determine Eskom’s tariff adjustments. For years, Eskom’s unhappiness has been confined to documents submitted to the regulator or to presentations made at hearings convened to adjudicate revenue applications. Now the dispute has gone legal and it will be up to the courts to determine who is right and who is wrong.