Around 10,000 homes and businesses across Cork and Kerry are without power with further outages expected, according to the ESB.
Gale force winds associated with Storm Hannah this evening have caused damage to the electricity network affecting approximately 10,000 homes, farms and businesses, predominantly in counties Kerry and Cork.
With the storm continuing to track across other counties, further damage to the network can be expected, the ESB has warned.
The damage is mainly attributable to trees falling on overhead lines as a result of the high winds, which have been recorded as in excess of 130 kph.
Areas most affected include the Iveragh and Dingle peninsulas and areas of West Cork, including Macroom.
ESB Networks said it is in the process of dispatching repair crews to affected areas to make the electricity network safe, assess the damage caused and safely restore power as quickly and effectively as possible.
A number of flights in and out of Cork airport have been cancelled.
Outgoing and incoming Aer Lingus flights to and from Amsterdam and London Heathrow have been cancelled and passengers have been advised to check with their airlines.
The ESB said there is a large fault in the Macroom and surrounding areas affecting almost 1,500 homes and businesses with power unlikely to be restored until 10pm.
More than 1,000 have also been affected near Lissarda while almost 300 homes and businesses have lost power in Fairhill near Cork city due to faults.
Hundreds more have been affected near Schull as the storm closes in.
Cork people have been urged not to approach fallen trees and to let the professionals handle it as Storm Hannah bears down on the region.
There have been reports of fallen trees from across the region including Glanmire and Courtmacsherry.
Speaking to The Echo, tree surgeon Eoghan O’Leary of Southern Tree Services, advised people to stay indoors and stay safe.
“Don’t approach fallen trees, contact the professionals and let them deal with it.
“Windblown trees are under a lot of different pressures and can cause serious damage in conditions like this.
“There’s no need to go outside during a storm and try to deal with it because it could lead to injury or worse,” he added.
Meanwhile, the fire marshal recently advised Funderland to close this evening.
Staff at the fun fair on the Tramore Road took down barriers and large posters at the venue before it closed.
The staff will assess whether or not to take down some of the larger rides in the coming hours depending on the severity of the storm.
It is hoped the fair will reopen tomorrow as usual but a staff member advised that it will depend on the impact of Storm Hannah.
Emergency response crews are on standby across the county as Cork County Council prepare for Storm Hannah to hit the region.
Kerry has been issued with a status red weather alert in the last few hours.
The entire Cork County area is subject to this Level Orange wind warning and the Council’s Severe Weather Assessment Team has convened in response to this weather warning.
Response crews have been put on notice and are on standby, according to the Council.
They have urged cyclists, motorcyclists and pedestrians to be aware of the danger posed by high winds as well as drivers of high sided vehicles.
People living near coastal, cliff and waterway areas are also asked to be extra cautious considering the forecasted winds which can lead to wave surges.
Gardaí are also appealing to the public to be extra cautious as severe winds are forecast this evening.
Status Orange Wind Warning for Cork, Kerry and Limerick is in place from 4pm today until 5am tomorrow morning. Gusts of 110 to 130 km/h are expected.
The weather warning for County Clare has been upgraded to Status Red.
Fota Wildlife Park said it will close early at 4pm today with last entry at 2pm.
Cyclists, motorcyclists and pedestrians should be aware of the danger posed by high winds as they are particularly vulnerable.
Ballincollig Regional Park is to close from 4pm with other public areas expected to follow suit.
Drivers of high sided vehicles should take all necessary precautions and pay attention to the warnings.
"We ask people living near coastal, cliff and waterway areas, particularly those with children, to be extra cautious considering the gusty winds forecast."
Please heed the Met Éireann warnings and be aware of local prevailing weather conditions. Updates will be provided on the Garda website and social media accounts.
Status Orange Wind Warning for Tipperary and Waterford is also in place from 10pm tonight until 2am tomorrow morning. Gusts of 110 to 120km/h are expected.
Cork County Council has said that emergency issues should be reported to 021 4800048.
The strong winds may give rise to localised power outages, the council also warned.
In the event of disruption to power supply, please contact ESB Networks at 1850372999.
In the event of disruption to water supply, please contact Irish Water at 1850278278.
Cork County Council said it will continue to monitor this situation.
Ahead of the storm, the Council is urging people to down loose items outside that cannot be brought in; have a torch, spare batteries and a battery radio ready; stay indoors –and keep pets in; clear window sills and close curtains to protect against flying glass; and keep in contact with family and neighbours especially people living alone.
In the event of an emergency call 999 or 112 and request the Fire Service, Ambulance Service, Gardaí or Irish Coastguard as appropriate.