The Independent Power Producer Procurement Programme. The Department of Energy (DoE), National Treasury (NT) and the Development Bank of Southern Africa (DBSA) established the IPPPP Unit for the specific purpose of delivering on the IPP procurement objectives.
Outer core. The outer core of the Earth is a fluid layer about 2,300 km (1,400 mi)[1] thick and composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle. Its outer boundary lies 2,890 km (1,800 mi) beneath Earth's surface.
The core of the Earth is the center. The inner core is solid, and is 90% iron. But the outer core is a liquid... and it's a good thing it is! More on that later. The outer core is made of a mixture of iron and nickel, with smaller amounts of silicon and oxygen. The outer core officially begins at a depth of 2550 km below the surface of the Earth, down to a final depth of 4750 km at the boundary between the inner and outer core.