logo di stampa inglese

RSI Utility

You are in: Customers » Service security and continuity » Security and continuity of the electricity service

Security and continuity of the electricity service

Electricity service safety and continuity
In 2011 the electricity distribution grids managed by Hera S.p.A. served approximately 392,000 customers, in twenty-four municipalities of the Emilia Romagna region, within the provinces of Bologna, Modena and Ravenna, distributing approximately 2,300 GWh of electricity.
The total length of the electricity grids managed by Hera through the Territorial Operating Structures of Modena and Imola-Faenza amounts to 9,942 kilometres, 73.6% of which in low voltage, 26.1% in medium voltage, and 0.3% in high voltage. 31% of the lines are underground, and the rest are overground lines. Following work carried out throughout 2011, there was an increase of approximately 2% in the distribution network extension compared to 2010; the increase occurred on the low and medium voltage lines, while the high voltage grid remained rather unchanged. The physical and administrative losses recorded in the distribution grid stood at approximately 4% and no accidents involving citizens occurred in relation to the electricity grids managed by Hera. In 2011, there were 3,048 cases of service reactivation after it was cut off due to delays in payment, a figure in line with 2010.
In 2011, supplies relative to electricity grid management and maintenance activities involved 12,300 days of work, particularly for activities related to new plants that were installed and grid maintenance. When suppliers sign the agreement, they are requested to train and inform their personnel on the specific risks that could arise when work is being carried out and on the protection and prevention measures to be implemented, and to provide their personnel involved in these activities with the proper clothing for the tasks they perform. The company has a procedure which specifies the criteria for identifying roles and responsibilities for emergencies, and defines general emergency management rules and procedures.
Polychlorobiphenyl (PCB) is currently present in 12 of the approximately 2,550 power transformers on the grids managed by the Modena Territorial Operating Structure, a strong drop compared to 2011: in fact, during 2011 a good 45 transformers which contained oils with PCB were disposed of. The management and disposal of this equipment is performed by adopting the necessary precautions in compliance with the current laws in force and with company procedures.

The integrated provisions of the AEEG regarding the service quality of distribution, measurement and sales of electricity for the regulatory period 2008-2011, approved with ARG/elt resolution ARG/elt 333/2007, governs, among other things, the continuity of the distribution of electricity, identifying indicators for measuring outages, monitoring systems and standards of reference.
The integrated provisions include the following indicators related to outages originating on the medium and low voltage grids for which the operator is responsible in the incentivising regulations:

  • the total annual duration of long outages without advance notice for low voltage customers;
  • the total annual number of long and short outages without advance notice for low voltage customers.
Continuity of the electricity service
Average number of outages per customer in high concentration areas (2011 tendential level 1.10)0.871.101.03
Duration of outages (minutes) per customer in high concentration areas (2011 tendential level 25.00)10.2015.667.94
Average number of outages per customer in medium concentration areas (2011 tendential level 2.00)1.821.931.88
Duration of outages (minutes) per customer in medium concentration areas (2011 tendential level 40.00)28.8821.1321.32
Average number of outages per customer in low concentration areas (2011 tendential level 4.14)5.724.754.66
Duration of outages (minutes) per customer in low concentration areas (2011 tendential level 60.00)61.2942.6241.34

The average figure refers to outages for low voltage service, without advance notice and due to causes that are the responsibility of the operator. The outage duration minutes refer to outages lasting for more than 3 minutes. The 2011 tendeltial level is defined as a weighted average of the value of the indicator in 2010 and 2011.

Regarding the outage duration, there was an average improvement in continuity for Hera customers in high and low concentration areas; there was a slight worsening for customers in medium concentration areas, however the level guaranteed was higher than that set by the Authority.
With a view to always pursuing higher continuity levels, in 2011 the Hera Group continued adapting the control devices to remotely control and motorise some electric stations and disconnecting switches on medium voltage poles.
Planned future developments include increasing the secondary remote-controlled stations and transferring the medium voltage grid from isolated neutral to compensated neutral (continuing to install the Petersen coils). The actions planned will help to reduce the duration and number of outages and the electricity suggestions on Group plants. Furthermore, the closing of some stretches of the loop grid will be completed, in order to increase the ability of the plants to carry out reverse current feeding, with a resulting decrease in outage times.
The number of requests for active connections to the distribution grid managed by Hera has increased significantly since 2007: there were 83 requests in 2007, 296 in 2008, 386 in 2009, and 1,179 requests in 2011, a slight decrease compared to last year, when there were 1,335. The total input power requested for the connection of production plants was 70,411 kW in 2011, a significant drop compared to 157,745 kW in 2010.

Replacement of electricity metres

The remote-control electricity metre is an innovative device which, thanks to remote management, allows for many activities to be performed remotely, including the reading of real consumption, activation and disconnection of users, increase or decrease in power and management of late payers.
The remote-control electricity metre provides a simpler and more transparent relationship between the customer and Hera, and, in addition, Hera does not require the presence of the customer in order to perform the remote activities.
In 2011 Hera installed about 26,000 electronic metres. At the end of 2011 there were approximately 249,000 electronic metres present in the electricity distribution grids managed by Hera, 97% of the total and two percentage points over the limit established for 2011 by AEEG resolution 292/2006.