L&T wins EESL tender for 5 mn smart meters. The tender is the world's largest single smart meter procurement. 4 million smart meters will be deployed in UP and the remaining 10 lakh in Haryana.The smart meters procured by EESL use GPRS technology to allow two-way communication between the DISCOM and consumers. Once installed, an energy supplier can read a meter via the mobile phone network. Householders can also receive a digital display which helps them to access how much power they are consuming - and its cost - in real time. Smart meters enable one to see the consumption pattern and the cost.