The National Energy Regulator of South Africa, NERSA, will appeal a court ruling that set aside part of an electricity price increase it had approved earlier this year. In March, NERSA approved a tariff increase of 9.4 percent requested by power utility Eskom. The Pretoria High Court however found that Eskom did not follow correct procedure when requesting the temporary additional increase. Regulator member for electricity at NERSA, Thembani Bukula..