The Emissions Trading Scheme will cover a total of more than 12,000 installations in the EU-25 (combustion plants, oil refineries, coke ovens, iron and steel plants, and factories making cement, glass, lime, brick, ceramics, pulp and paper). In larger Member States some 1.000 to 2.500 plants are covered, while in most other Member States the number of plants covered tends to range from 50 to 400. The number of companies affected by the Directive is obviously smaller, as large companies have many plants covered by the trading scheme.