Yes. You can connect and register a micro-generator in parallel with ESB Networks provided the requirements in the updated document "Conditions Governing the Connection & Operation of Micro Generation Policy" are met.
Please familiarise yourself with the process and read the updated document:
Conditions Governing the Connection & Operation of Micro Generation Policy | View PDF 518 KB
Form:
NC6 Notification Form PDF | 135 KB
Note this form should be used for all new and retrospective microgeneration applications.