TANESCO’s Generation division is responsible for all power generation functions owned by TANESCO. Other sources of generation are from independent power producers (IPPs) which feed the National grid and isolated areas as well.
TANESCO’s generation system consists mainly of Hydro and Thermal based generation.  Hydro contributes 57 % of total power generation from january 2012 up to december 2012.Gas and Thermal contributed the remaining amount. During the year 2012(Jan to Dec 2012) the total units generated to the grid and isolated plants was 5,759,756,313 kWh or units.TANESCO own generation was 3,110,436,062 kWh while the imports from IPPs and neighbour countries (Uganda and Zambia) were 2,649,320,551 kWh.
TANESCO operates own hydropower generating stations interconected to the national grid system.The installed capacity is; Kidatu 204 MW;Kihansi 180 MW;Mtera 80 MW; Pangani 68 MW;Hale 21 MW;Nyumba ya Mungu 8 MW and Uwemba 0.82 MW totalling 561 MW of hydro generation.
In recent years TANESCO has impleted a thermal hydro power generation mix programme. A substantial amount of generation comes from gas and diesel thermal generation through own plants and independent Power Plants (IPPs). Own thermal generation comes from the Dar es Salaam-based Ubungo gas based 100MW plant,Tegeta  45MW which was commissioned in December 2009 and Ubungo || Gas Plant which was commissioned in July 1st,2012 by Hon.Prof Sospeter Muhongo (MP),Minister for Energy and Minerals.
Future generation plan will largely be dominated by Coal and Gas power plants.

TANESCO owns interconnection power grid made up of generation system transmission and distribution system. Transmission system comprises of forty three (43) grid substations interconnected by transmission lines. The transmission lines comprise of 2732.36 km of system voltages 220kV,1538.5km of 132kV;and 546 km of 66kV, totalling 4816.86km by the end of November, 2012
Transmission lines use pylons made of still. Almost all the transmission lines are radial single circuit lines. The system is all alternating current (AC) and the system frequency is 50 Hz.

The total installed capacity in the Main Grid System amount to 1438.24MW. The system is hydro-thermal mix, constituting hydro 561.84 MW (39%) from thermal plants (gas -  501 MW and liquid fuel 375.4MW) mainly from IPPs.
The Main grid system demand of 2011 was 828.99 MW as recorded on November 09th 2011 at 20hrs. The highest grid system demand of 2012 was 851.35 MW recorded on 22.10.2012 at 20hrs.  The transmission system losses recoreded in 2011 was 6.3% and 6.12% as a record of the year 2012.

Distribution and Customer Services

The marketing Business Unit stands at the customer end of the electricity supply chain and is therefore Tanesco’s major interface with customers. It deals with distribution of electricity, promotion of services and all customer service matters.
The unit is headed by a General Manager who is assisted by two senior managers; a senior manager for marketing and customer service on the one hand and a senior manager for distribution on the other. Services of the Marketing Business Unit are delivered to customers through a network of 24 Tanesco defined regions. To ensure effective management of operations, these regions are clustered into five zones each headed by a Zonal Manager.
The Marketing and Customer Service Division is led by the Senior Manager Marketing who oversees the operations of three sections namely the Marketing Section, the Call Centre Section and the Large Power Users section.

The Marketing Section
The marketing section at Tanesco is entrusted with the responsibility to develop insight into customer needs and deliver promotion campaigns that will elicit customer interest and favourable action towards Tanesco services. Click here for further information on the functions of this section.
Large Power Users Section
It is estimated that over 80% of all Tanesco revenue is earned from only 1,700 Large Power Users (LPUs) who forms 0.24% of all customers countrywide. LPUs are those customers that consume over 7,500kWh per month. Ironically, the biggest non technical losses also originate from this group of customers which is only 0.24% of total customers. Management of LPUs is therefore of paramount importance to Tanesco.
Safeguarding the 80% of revenues from the LPUs is given high priority. That is why meter commissioning and meter auditing to LPUs is administered right from the Head Office’s Marketing Division via the Department of Large Power Users.
The LPU Department runs two sections:
  • The Meter Workshop Section which is responsible with commissioning of LPU meters and attending defective LPU meters.
  • The Revenue Protection Section which is responsible in auditing LPU customers as well as supervising and giving technical assistance to Regional Revenue Protection Units.
From 2007 to 2008 the Marketing Division carried out a Pilot Project on the use of Smart Meters to establish an Automatic Meter Reading (AMR) System where meters can be read and monitored remotely. Over 100 AMR meters were installed during this Pilot Phase.
In 2009 the AMR meters were approved to be rolled out to all LPU customers.
By the end of year 2009, 2,130 AMR meters were procured for LPUs and 8,000 AMR meters were procured for Medium Power Users (Tariff 1 customers using three phase meters).
Accordingly, a third Section is under establishment within the LPU Department that will manage the AMR System. It is known as ‘The AMR Center’. This Section is expected to take off by February 2010.
These meters are not only powerful weapons in the war against energy theft, but also they will cut down meter reading costs, they will eliminate meter reading errors, and for the case  of Tariff 1 three-phase customers, they can be disconnected remotely for non-payment of bills, further cutting down operation costs.
Call Centre Section
This section is currently in the establishment stage. It will be run by a manager assisted by a principal customer service officer. Their main task at present is to establish a state of the art call centre that will enable handling of customer service issues from across the country.
The centre will be based at Tanesco Head Office, Umeme Park, Ubungo Dar es Salaam from where customer querries, requests for assistance and complaints will be received and handled. In essence the call centre will act as a coordinator for resolving customer service issues.
Headed by the Senior Manager Distribution, this division is responsible for distribution, Health & Safety as well as rural electrification.
Operations Section
It is through this section that the Marketing Business Unit overseas the operations of regional operations. The section monitors regional operations through regular reports such as weekly and monthly reports and also various statistical analyses based on regional reports.
One of the major roles of the operations function is to ensure the availability of distribution materials of the right quality to enable smooth distribution of electricity to customers. The section also carries out survey for the purpose of mapping out distribution networks. To ensure continued and uninterrupted distribution services, the operations section has also been entrusted with the responsibility for overseeing maintenance of electricity distribution network.
The Distribution function also draws specifications of various distribution materials to as to ensure materials procured conform to the required standards.
The Operations Section of the Distribution Division also carters as an R&D unit thus working in search for new technology that will ensure efficient use of materials at low cost.
Health & Safety Section
While we all need electricity, we all should know that electricity is dangerous. Tanesco workers are exposed to risks of accidents while at work. Our customers are also exposed to electricity related risks due to poor electrical installations and faulty electrical appliances. Electricity can kill or cause severe and permanent injury but careful planning and straightforward precautions can help us avoid most of the accidents.
Our health and safety unit was established for the purpose of ensuring all possible measures are taken to prevent electrical accidents and creating a health wise sound working environment in accordance with the Occupational Health & Safety Act. To learn more about this section click here.
Electrification Section
Tanzania has one of the lowest electrification levels on this planet. Our electrification section has been tasked with the challenge of identifying new areas for electrification and developing proposals for the purpose of soliciting funds.
Also the section acts as a link between the company and the Rural Electrification Authority as well as other financiers of the various rural electrification projects such as the ADB, the World Bank, and NORAD.
The Electrification Section also ensures the proper management of the various projects that are under construction up to the time they are handled to the respective regions.