The permits, which include strict conditions to protect the environment, enable to undertake planned water discharge activities into Llyn Padarn and Nant y Betws in Llanberis to operate a pumped storage facility for the hydro-electric scheme at Glyn Rhonwy.
Quarry Battery Company developed Snowdonia Pumped Hydro to develop the scheme and offer stability across the construction and operation phases.
The project is expected to be completed in 3 to 4 years. It will have a payback period of 15 years.
As per the NRW, the permissions have been given with strict conditions. It conducted a in-depth assessment of the applications, gathered advice and technical evidence before issuing the grant.
NRW operations manager Euros Jones said: “Llyn Padarn is a vitally important natural asset for the area. It’s important for wildlife, for people and the local economy.
“We only issue an environmental permit if we are satisfied that the company’s plans prove they will operate safely, without harming the environment or local communities."
The project application was submitted to NRW in October, last year and has satisfied previous concerns and it includes conditions that offer appropriate protection to the environment.
Environmental permits are separate from the planning process, which is managed by Gwynedd Council and the Planning Inspectorate.
BBC reported that there were concerns about the lower quarry being contaminated by ordnance being dismantling done by the RAF in 1970s. But, according to SPH, independent testing showed no contamination of surface and ground water.
