You can apply to the Register of the Regulatory Authority for Waste, Energy and Water for an issue:

• Certification of an electricity producer from renewable energy sources and high-efficiency cogeneration 
• Certification of an electricity producer from Hybrid Stations (with integrated storage device)
• Certificate of registration of an Excluded Station multiple-unit
• Electricity Storage Licence

You will need:

• your personal Taxisnet credentials
• to attach the necessary information and supporting documents on a case-by-case basis

The applications are assessed by the Register of the Regulatory Authority for Waste, Energy and Water and the relevant decisions are published online in a single portal DIAVGEIA.