Today it is shared between State-owned firms, which in some countries continue to have a monopoly over the activity, large transnational enterprises from Europe, the United States or other countries of the region, and, to a lesser extent, domestically owned private enterprises. As in other regulated sectors (telecommunications, water and sanitation, transport), the regulatory framework is the main determinant of private investment —including FDI— in the transmission and distribution segments, whereas in the generating segment, the key factors are risk sharing mechanisms and price setting. Section B presents an overview of the sector, focusing particularly on the business dynamic.