If you have an old electro mechanic meter it will be replaced by a bi-directional smart meter measuring not only the electricity that you will import from DEWA electricity grid, but also the electricity that you will export to DEWA grid. If a DEWA smart meter is already installed at your premises this change will not be required, as your meter will be already fit for the purpose.
A second smart meter will be installed by DEWA to measure the electricity generated by your PV system.