Acea Ato2 Spa

Since 2007 the acquisition of contracts with the municipalities involved has slowed. This has been caused by local authorities’ natural political alternation and internal difficulties within the authorities themselves. Moreover, based on assessments carried out, certain municipalities still have problems relating to the state of treatment plants and lack of authorisation for waste disposal.

No other Integrated Water Service management was acquired in 2011.

Drinking water

ACEA ATO 2 S.p.A. provides the full range of drinking water distribution services including collection and abstraction, as well as retail and wholesale distribution.

Water is abstracted from sources on the basis of long-term concessions.

Ten water sources – including five sources (Peschiera, Capore, Acqua Marcia, Acquoria and Salone), 4 well fields (Pantano Borghese, Finocchio, Torre Angela and Torre Spaccata) and the Lake Bracciano Aqueduct – supply approximately 3,000,000 people in Rome and Fiumicino, as well as more than 60 municipalities in the Lazio region, via four aqueducts and a hierarchical system of pressurised pipes.

Three further sources of supply provide non-drinking water used in the sprinkler system of Rome.

In addition, ACEA ATO 2 S.p.A. manages the Simbrivio aqueduct, which supplies water to 54 municipalities and 3 consortia, the Laurentino aqueduct (formerly CASMEZ Lazio Regional Authority), which supplies the municipalities of Pomezia, Ardea and the Campoleone area in the municipality of Lanuvio, the Doganella aqueduct, serving 8 municipalities in the Castelli Romani area, and the distribution of water in 73 municipalities in addition to Rome.

With regard to major disruptions, the most significant ones are detailed below.

  • On 18 January 2011, to allow works to be completed to improve the water service in the Castelli Romani area, water was cut off in the section of the new Simbrivio Castelli aqueduct that supplies the municipalities of Albano Laziale, Ariccia, Genzano di Roma, Castel Gandolfo and Lanuvio;
  • On 23/01/2011, in order to allow the completion of urbanisation works included in the Laurentino Urban Recovery Plan, the pipeline on via Laurentina near via Celine was cut off, with drops in Undici Ponti, Ferratella, Giuliano Dalmata and Colle della Strega;
  • On 20 February 2011, due to an unexpected fault on the main DN 800 course of the new Simbrivio Castelli aqueduct, drops in pressure and a water shortage were recorded in the municipalities served by the aforementioned pipeline. Normal operating conditions were restored on the morning of 21/02/2011;
  • In the night between 8 and 9 March 2011, due to unexpected damage to the Peschiera aqueduct after an accident in the section in the municipality of Sant’Angelo, Acea Ato2 intervened immediately by carrying out stabilising measures on the supply system, restoring normal running conditions on the water network in the city of Rome on the same night, except in the area of Santa Lucia in the municipality of Fonte Nuova, for which the tanker truck system was implemented. Repair works on the damaged section were difficult and completed in the first few days of April. Consequently, it was possible to restore normal water abstraction structures in the entire metropolitan area;
  • In March, major ruptures were discovered on sections of the Simbrivio aqueduct, some of which attributable to landslides caused by heavy rain, which affected the pipes. The company intervened immediately, restoring the water service as quickly as possible and ensuring the emergency water tanker service during the suspension of the water service. As regards landslides, these concerned the institutional bodies responsible for finding a definitive solution to the problems of stability on slopes on which the water aqueduct networks managed by this company rest;
  • On 26 May 2011, to order to allow the commissioning of the new Pozzo San Pietro drinking water purification plant and the new lifting system at the Vascucce water plant, it was necessary to suspend the water flow in the Municipality of Velletri. Normal operating conditions were restored on the night of 26 May 2011;
  • On 24 and 31 July and 7 August 2011, as part of the construction of the new Tiburtina station and related works, suspensions to the water service were effected on 6 important abstraction pipelines called Acqua Marcia siphons which supply the central area and east of the city of Rome with a total capacity of around 2 m3/s. During said occasions, to overcome interference with the new Tiburtina station, a shifting operation was carried out and simultaneous repairs on the pipes. This involved the design and completion of large infrastructural, construction and hydraulic works consisting of flyover tunnels on the railway line and the city’s new internal bypass. Thanks to the interconnection of the abstraction network serving Rome, it was possible to contain the effects of the temporary disruption to users;
  • On 13 November 2011, in order to allow the completion of significant safety works on the new Simbrivio Castelli aqueduct and to improve the water service, water was shut off on said aqueduct which concerned 33 ATO2 municipalities, in agreement with the authorities and area organisations and in coordination with the Prefecture of Rome.

In addition, the main works completed in 2011 included the commissioning of the Santa Palomba water plant and its activation to serve the municipality of Albano Laziale and the partial activation of the new “Colli” water plant in the municipality of Albano Laziale.

As regards exceptions relating to water quality, these currently refer to a population of around 23,000 inhabitants for arsenic and roughly 27,000 inhabitants for fluorine. The exception provisions, or the Decree of the President of the Lazio Region T0258 of 29 July 2011 for arsenic and Presidential Decree T0076 of 11 March 2011 for fluorine, make provision for the return within the limits set by Legislative Decree no. 31/01 by 31/12/2012. In the meantime, the company is carrying out the work set out in the restoration plans. Simultaneously, an information campaign was targeted at the population, in agreement with the municipal administrations, ASL (Local Health Authorities) and STO. In addition, Acea Ato2 realised supply points distributed throughout the areas concerned in which it is possible to procure water resources in compliance with Legislative Decree no. 31/01, and to distribute bottles of mineral water in schools. As regards the vanadium, Acea ATO2 completed works for the restoration and, in any case, in December 2011, the Ministry of Health changed the value of the vanadium parameter from 80 micrograms/litre to 140 micrograms/litre.

Sewerage and waste water treatment

The sewerage service comprises a sewage network of about 6,020 km (including approximately 4,050 km of network serving the municipality of Rome) and more than 300 km of collectors.

ACEA ATO 2 S.p.A. manages the waste water treatment system and pumping stations that serve the network and sewage collectors. Some of them are quite large, with a throughput of more than 10 cubic metres/sec, and in some cases they also provide flood protection.

In 2011 the main waste water treatment plants handled around 599 million cubic metres, an increase of around 2.0% compared with the previous year.

Sludge, sand and grating production for all managed plants was equal to 150,885 tonnes, up approximately 10.3% compared to the previous year.

At the end of December 2011, ACEA ATO 2 S.p.A. managed a total of 489 sewage pumping stations, including 169 in the municipality of Rome, and a total of 173 waste water treatment plants, including 35 in the municipality of Rome.

Research and development

In cooperation with LaboratoRI S.p.A., research and development activities continued, in terms of the analysis of distribution networks and research of leaks according to the district metering approach set out in Ministerial Decree 99/97, which was performed mainly in the municipalities of Monterotondo, Grottaferrata, Riano, Fiano, Santa Severa in the municipality of Santa Marinella, Cerveteri, Subiaco.

Adoption of a single tariff

As is well known, the Technical Regulations attached to the Management Agreement set out (art. 12.2) that, for the launch of the management of ACEA Ato 2 S.p.A., like the initial tariff structure, the current tariff structure should have been adopted in each municipality. Moreover, these structures would have been unified with regard to the one in force in the municipality of Rome.

Moreover, the Mayors’ Conference with resolution no. 4/02 of 10 December 2002 envisaged a gradual convergence of pre-existing tariffs for services managed by the municipalities acquired in line with the Area Plan, within a maximum term of six years from 2003 (transitory period).

The tariff convergence plan cited above envisaged that the acquisition of all municipalities of the ATO would be finished by 31 December 2005, guaranteeing the last municipalities to join a tariff adjustment period of at least three years (up to 31 December 2008).

Given the plan to acquire municipal management of the services was not completed within the prescribed time frame, with resolution no. 02/06 of 23 February 2006 the Mayors' Conference extended conclusion of the acquisition phase to 31 December 2007.

Consequently, and in line with the criteria established by resolution no. 4/02 of 2002, the last term of the period of adjustment of the average, individual municipal tariffs in line with the average area tariff was extended to 2010.

In addition, the conference resolved to approve the adoption of a single tariff structure for the entire ATO 2, without prejudice to the need to guarantee the operator the revenues recognised in the 2009-2011 period (iso-revenue).

Given that, afterwards, the need to cancel, by 31 December 2010, the minimum commitment for domestic users was reaffirmed, as set out in CIPE Resolution no. 117/2008 and that this commitment was also reaffirmed by Co.N.VI.RI., according to which this provision was deemed applicable also for the Management in which the Ministerial Decree of approval of the Standardised Method of 1/8/1996 is applied, the Mayors’ Conference of 14 December 2010 mainly resolved, by means of Resolution no. 6/10, to:

  • adopt, as of 1 January 2011, in the municipalities of ATO 2 that, as at this date, have transferred, or will transfer, the services to ACEA Ato2 S.p.A., the single tariff structure (see tables: “Annex 1 to resolution no. 6/10”), with the increase in the Average Tariff approved by the Mayors' Conference (the single tariff adopted sets out, in particular, a basic tariff, a reduced tariff and three surpluses for domestic users, as well as a basic tariff and three surpluses for non-domestic users. Moreover, the minimum commitment for domestic users will be cancelled, with a consequent increase in the fixed amount and maintenance of the minimum commitment for non-domestic users);
  • to adopt a governing implementation of the single tariff structure;
  • to establish a division into instalments of the bills for the households from those municipalities affected by an increase of more than 40% between the old and the new tariff, for specific consumption hypotheses;
  • to apply a 10% discount (for the first year of adoption) on the bills of domestic users affected by an increase in annual expenses of more than 20%, given specific consumption hypotheses;
  • to apply a single tariff to those municipalities whose integrated water service will be transferred (entirely or partially) to ACEA Ato2 S.p.A., starting from 1 January 2011, from the time of the transfer taking place.