The generation mix, which is an Integrated Resource Plan 2010 (IRP2010), is currently under development by government. This plan will determine the type of electricity generation technology that should be used, such as coal, nuclear, hydro, wind or solar. The generation mix further includes two conventional hydroelectric power stations and two hydro pumped storage schemes. These stations are used when there is a sudden increase (or peak) in the demand of electricity which cannot immediately be met by the base load stations. They have a combined installed capacity of 2 000 MW.