A worsening situation at Kariba power Station — the country’s main power source — affected by dwindling water supplies, threatens to make a bad situation even worse.   PLAYERS in the manufacturing industry are querying the rationale behind power utility, ZESA Holdings’ proposed tariff hike of nearly 49 percent. Struggling to remain afloat, ZESA is proposing to increase the electricity tariff to US$0,14 per kilowatt hour from the current US$0,098. The increase would put Zimbabwe at par with regional peers, ZESA argues. For instance, Namibia charges US$0,14 per kilowatt hour; South Africa at US$0,13 per kilowatt hour; Zambia at US$0,10 per kilowatt hour and Botswana at US$0,09 per kilowatt hour. Energy and Power Development Minister, Samuel…