The eThekwini Metro says its already fragile electricity grid will be at a higher risk after the National Energy Regulator of SA (Nersa) rejected its proposed 18.5% electricity tariff hike. In a letter addressed to city manager Musa Mbhele, which News24 has seen, Nersa CEO Nomalanga Sithole said, at a meeting on 2 June, it approved a 15.1% tariff increase for the 2023/24 period.