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The Prosol program (2005-2010) successfully scaled the deployment of solar water heaters in Tunisia by combining capital subsidies, concessional credit, and a unique risk-mitigation framework. By leveraging the state utility STEG as a debt collector and guarantor, the program reduced credit risk for commercial banks, leading to a 1:5 public-to-private investment ratio. The initiative not only increased installed capacity fivefold but also generated significant fiscal returns for the Tunisian government by reducing expenditures on liquefied petroleum gas (LPG) subsidies.