The Gissi Plant
The Gissi Thermoelectric Plant, owned by Abruzzoenergia in which A2A has a controlling 94,95% share, is located at the Valsinello Industrial Site in the Municipality of Gissi (CH). Construction of the plant commenced in December 2004, using combined cycle technology, which is among the most innovative solutions currently available for electricity production. In fact, combined cycle technology allows energy to be produced with maximum efficiency while keeping its environmental impact to a minimum.
The Plant is made up of two parallel sections with an overall electricity capacity of approximately 800 MW, powered by natural gas.
Each section has a gas turbine associated to a steam turbine activated by the residual heat from waste gas. This residual heat is not therefore dispersed to the surrounding atmosphere, but recovered for the production of electricity. Accordingly, the relationship between ingoing thermal energy and electricity produced is higher than that of a traditional thermo-electric plant – which means that significant savings are made in producing the same amount of energy both in terms of fuel consumed and emissions to the atmosphere.
Principal characteristics of the plant:
- 2 generator sets with a single-pole combined cycle
- Net yield: 57 %
- Fuel: natural gas
- Alstom GT 26B two-stage combustion turbine
- Nitrogen oxide reduction system (Dry Low NOx burners) and a catalytic reduction system for carbon monoxide.
The Plant was designed with particular regard to all aspects of reduction of its environmental impact: the use of resources, water emissions, emissions to the atmosphere, acoustic emissions and landscaping.
The plant was also designed according to international safety and industrial risk standards, and does not use toxic substances so as not to create any risk of contaminating the environment. Its performance and emissions to the atmosphere are continuously controlled using an efficient and certified monitoring system.
Water supplied to the plant is not drawn from the water table but taken from an existing associated purification plant and water recovery system for the water used in the Plant, which enables consumption to be kept to a minimum. Moreover, the choice of using a dry cooling system means that no water is consumed in this process, again allowing for a reduction in water vapour, and consequently, it does not impact on the microclimate.
Natural gas, together with the extremely high yield of the combined cycle, means that the percentage volume of CO2 in waste gas is kept to an absolute minimum in plants produced on an industrial scale. This is an efficient way to reduce greenhouse gas emissions in accordance with the standards set by the Kyoto Protocol.
The machinery used is enclosed in soundproofed cabins that contain noise emissions both inside the plant and to the surrounding environment.
The Plant was also designed to keep its physical impact on the environment to a minimum. In particular, this was achieved by choosing the most appropriate colour for the structure. The use of iridescent colours mitigates the visual impact of the main part of the facility softening its impact on the surroundings making it less imposing, while the choice of colour for the tower on the one hand acts as camouflage, and on the other, makes its singular characteristics more distinctive.