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About

Twenty years of field systems, now as products

GridBit is a spin-off of ADD Bulgaria, a company from Plovdiv that has digitised electricity grids and street lighting since 2006. GridBit carries the products that grew out of that work: the platform, the systems and the hardware.

  • Plovdiv, Bulgaria
  • Since 2006
  • Hardware and software from one team
20
years of work for energy companies, municipalities and industry
2.5 M+
smart meters in Bulgaria and North Macedonia
5 000+
street lighting cabinets under management
80+
municipalities with GridBit street lighting control

Where GridBit comes from

From remote metering to smart infrastructure

10 %+
lower non-technical losses for metering clients
20 %+
lower energy and maintenance costs

Results reported by ADD Bulgaria for its clients.

ADD Bulgaria started in 2006 with remote metering of electricity, one of the first practical steps in the digital transformation of the energy sector. What began as a trading business became an integrator, and then a vendor with systems of its own.

Those systems now reach millions of users and hundreds of settlements: smart meters, street lighting control, monitoring of the low-voltage grid and, since 2026, buildings. The clients are energy companies, municipalities and industrial enterprises, where reliability, security and steady support come first.

GridBit is the product side of that work. The name first stood on the street lighting and grid monitoring systems. Today it covers the device management platform, the four systems and the DIN-rail hardware on this site.

In numbers

What twenty years add up to

2 500 000+
smart meters in Bulgaria and North Macedonia
21 000+
data concentrators installed
5 000+
street lighting cabinets digitised
150 000+
luminaires under control
80+
municipalities
4
electricity distribution companies in 2 countries

Numbers of ADD Bulgaria, 2026.

History

Twenty years, project by project

  1. 2006

    ADD Bulgaria is founded in Plovdiv

    The work starts with remote metering of electricity.

  2. 2009

    The first large smart metering projects

    Between 2006 and 2009, with the electricity distribution companies in Bulgaria.

  3. 2010

    The first street lighting project

    • Smolyan
  4. 2011

    Smart metering in North Macedonia

  5. 2014

    Street lighting for a whole municipality

    • Roman
  6. 2016

    Shared manufacturing with ADD Polska

    The metering project in Bulgaria continues to grow.

  7. 2018

    Smart lighting on the coast and at the border

    • Sozopol
    • Dragoman
  8. 2019

    A cybersecurity project for smart metering

    Encrypted communication with and between millions of electricity meters, one of the few such projects in the industry.

  9. 2020

    A pilot for monitoring of the low-voltage grid

    The work that became GridBit EIM.

  10. 2021

    Retrofit metering for Marina Flisvos in Greece

    Automated reporting of water and electricity for the largest private marina in the country. New street lighting projects at home.

    • Bansko
    • Kresna
  11. 2022

    Street lighting in four more cities

    • Pomorie
    • Plovdiv
    • Pazardzhik
    • Pernik
  12. 2023

    The map keeps filling

    • Vratsa
    • Devnya
    • Smolyan
  13. 2024

    More than 80 municipalities

    • Yambol
    • Dupnitsa
    • Dobrich
  14. 2026

    Twenty years, and a new direction

    ADD Bulgaria joins the Siemens Xcelerator Marketplace as an approved partner, shows its systems at Light + Building and enters the building sector. GridBit carries the products forward.

Being first

Remote control of street lighting was once an unfamiliar idea. We ran dozens of seminars for designers, municipalities and contractors. In the first years that brought one or two projects a year. Today it is an industry standard.

Being first is slow. Many clients hesitated before a technology that was ahead of its time, and the work went on when results were hard and scepticism was loud. That patience is now one of the strongest things the team has.

Products

What GridBit develops

Four systems on one platform, and the DIN-rail hardware under them.

Eight DIN-rail modulesGateways, a three-phase meter, an astronomical relay, a voltage detector and watchdog relays, each with a datasheet and a Modbus register map.All hardware

Principles

How the team works

  1. We run what we sell

    The systems on this site work every night in more than 80 municipalities and in the grids of four electricity distribution companies. What breaks in the field comes back to the same team.

  2. Hardware and software from one team

    The modules, the firmware, the platform and the applications are developed together, so there is one vendor to call for the device and for the screen.

  3. Security is part of the design

    The team delivered one of the few successful cybersecurity projects in the industry: encrypted communication with and between millions of electricity meters.

  4. Partnerships that last

    The first metering projects started in 2006 and are still growing. Clients stay because the service stays.

Where the systems work

Bulgaria, North Macedonia, Greece

Street lighting control in more than 80 municipalities across Bulgaria. Smart metering in Bulgaria and North Macedonia. Metering of water and electricity for Marina Flisvos in Greece.

BalchikDobrichDobrichSozopolPomoriePomorieDevnyaSungurlareYambolYambolOmurtagLyubimetsRuseRuseDimitrovgradDimitrovgradDryanovoKardzhaliKardzhaliKirkovoSvishtovSvishtovPavlikeniBrezovoSopotPlovdivPlovdivHisaryaSmolyanSmolyanSaedinenieStamboliyskiDevinPazardzhikDospatBelovoSarnitsaRomanMiziyaMezdraVratsaVratsaBanskoSofiaSofiaMontanaMontanaDupnitsaDupnitsaPernikDragoman

Municipalities with GridBit street lighting control

  • Balchik
  • Dobrich
  • Sozopol
  • Pomorie
  • Devnya
  • Sungurlare
  • Yambol
  • Omurtag
  • Lyubimets
  • Ruse
  • Dimitrovgrad
  • Dryanovo
  • Kardzhali
  • Kirkovo
  • Svishtov
  • Pavlikeni
  • Brezovo
  • Sopot
  • Plovdiv
  • Hisarya
  • Smolyan
  • Saedinenie
  • Stamboliyski
  • Devin
  • Pazardzhik
  • Dospat
  • Belovo
  • Sarnitsa
  • Roman
  • Miziya
  • Mezdra
  • Vratsa
  • Bansko
  • Sofia
  • Montana
  • Dupnitsa
  • Pernik
  • Dragoman

The map shows the municipalities from the project map of the street lighting system.

Illustration of an electronics production line

Plovdiv

Development and production in one city

The engineering team and the production base of ADD Bulgaria are in Plovdiv. An electronics manufacturing partner uses the same production base.

GridBit is a spin-off of ADD Bulgaria Ltd., 141V Vassil Aprilov Blvd., 4027 Plovdiv, Bulgaria. www.add-bg.com

  1. 2006FoundedADD Bulgaria starts in Plovdiv
  2. 2026Siemens XceleratorApproved partner in the Marketplace
  3. 2026Light + BuildingThe systems at the international fair
  4. TodayGridBitThe products as a spin-off

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