The guarantees offered by Combined Cycle Plants, in terms of respect for the environment, are highlighted by the fact that throughout Europe around 50 such plants have been built or are in the final phase of construction. Of these, 22 are in the United Kingdom, 6 in Holland, 2 in Italy, 3 in Germany, 5 in Belgium, 1 in Portugal, 5 in Ireland, 1 in Hungary, 1 in Greece, 1 in Finland, 2 in the Czech Republic and 1 in Austria. There are also plans to build in the region of 30 such plants at various sites in the Basque Country and throughout the Spanish State. Ireland, through the ESB, has been at the forefront of Combined Cycle technology since 1979.

The option of a gas turbine Combined Cycle Plant (CCP) means that the heat, which is later transformed into electricity, is used more efficiently. There is a heat efficiency of up to 55% compared to 30/36% for the obsolete thermal power station. A CCP consumes less energy and uses fewer resources.

Dioxins are compounds that are formed during the burning of fuel such as coal, wood or petroleum by-products. There is no possibility of these compounds being formed in the case of the Combined Cycle Plant to be built at Amorebieta-Etxano since it will operate exclusively on natural gas.

The difference between a thermal power station and a Combined Cycle Plant is, for all practical purposes, the same as that between an old fashioned coal- or wood-burning cooker and a gas cooker. A CCP does not produce black smoke, or ash, or cinders, or soot. Besides, there are no emissions of nitrogen oxide or particles thus completely removing the possibility of acid rain. Its net environmental impact is almost one tenth of that produced by the old, familiar thermal power stations.

The natural gas is piped in from the main gas pipeline that passes through Boroa, thus eliminating the need for storing large quantities of liquid fuel. This in turn means that there is no possibility of occasional spills or dangerous accidents. Transmission lines distribute the product and this eliminates the disturbance caused by road transport.

The cleanest, most natural and most ecological fuel. The same gas as that used for domestic purposes in many Basque homes.