In 60 seconds: Gwynt y Mor wind farm

The second biggest offshore wind farm in the world is officially opening off the north Wales coast.

The £2bn Gwynt y Mor project is already a familiar sight eight miles (13km) off Llandudno and Colwyn Bay in Conwy county.

All 160 turbines are fully commissioned and generating up to 576 MW of electricity - enough for up to 400,000 homes, says energy company RWE Innogy UK.

BBC Wales Iolo ap Dafydd takes a closer look.