Could Ireland survive without importing anything?

The amount of fish from our waters shipped to Spain and France we’d be ok for seafood

Nope. Because those industries are utterly dependent on imported grain, which the OP has said you can't do.

Edit: Reflecting on this, we have to appreciate that most Irish cattle are kept indoors for 3-4 months per year. Trying to feed the grass in fields during the cold weather would mean weight loss, illness and the fields being in utter mush from the weight of the cattle on wet ground. Without the imported grain and the ability to harvest silage with machinery, the risk is that many cattle and other animals would starve if the disruption lasted for a winter. A cull of a large number of the animals would reduce demand for feed and allow those cattle to be fed to other cattle, oh sorry we don't do that any more, to humans.

We'd be fine after an initial disruption. We have enough food to feed ourselves 10 times over. Energy wise we now produce 30 % of our own thru wind alone. Thanks to the efforts of people like eamon Ryan this is increasing all the time. With more offshore turbines being rolled out we can easily double this by 2030.

Sail boat, donkey and kart, like it was in the old days.

That is what would have to happen if we could not import fuel.

Sailboats

Rods

We'd all have to go shopping in Newry.

Vegans would die out.

Not necessarily a bad thing.

Not a chance. Ireland makes a lot of foodstuffs, but very little actual food.

Sure around here there's thousands of acres given to barley for whiskey .

No way would farmers be able to pivot and provide enough food for the population. Even if we could grow it, we don't have the resources to refine it and transport it.

Just for fun, read the book World War Z about a zombie apocalypse. Nothing to do with the movie. There's a chapter where society is trying to rebuild itself, but no one has even basic skills. There's a lovely bit where a cleaner becomes the supervisor of her former employer, because the employer used to be a digital marketer which is now a useless job

By horse and cart or by bicycle if you hav’nt. horse

Unless we have some way to stabilise the grid with asynchronous generation, very little of our electricity will be coming from Wind or Solar.

We have (at best) 10% of our gas needs coming from Corrib, the rest is imported. In an emergency, GNI will prioritise residential rather than industrial customers. Therefore 0% gas will go towards electricity production. Eirgrid currently has a system stability limit known as the SNSP which is set to 75% for non synchronous sources. That means that for every 1 MW of electricity produced, 25% of it will have to come from synchronous sources such as thermal or hydroelectric.

We have approximately 500 MW of run of river hydro and pumped storage, so in theory we could have 1.5 GW of wind or solar to complement it. But both hydro and pumped storage are energy limited and cannot run at peak output indefinitely. In summertime, unless it's particularly rainy, the hydros won't be able to run much at all. Pumped storage can only run while the reservoir is full, once it is empty, then you have to use your limited electricity to fill it again. In this case, you'd be using the 200 MW of hydro plus 600 MW of wind or solar. But again, if it's not raining, good luck...

Even with the amount of agricultural land we have and our low population density, we'd be just as fcuked as other countries. Societal breakdown would start within hours as thousands of idiots descended on supermakets to fight each other over white bread and toilet roll.

Yep, that's the seasons though.

Our winter is their summer, the alternative is no summer fruits in the off season, or we build vertical farms and grown everything in artificial conditions.

I saw a company selling 40 foot containers which contain everything needs to grow fodder for cattle. They're designed to be dropped in African countries. You feed water, seeds and liquid fertilizer in one side and get a constant feed of grass put the other. I was thinking would it work for human edible grasses too

Breakimg it down, what is important is food, water heat/energy, shelter and security. We would have 12 to 24 months or 2 or 3 harvests to rejig the economy and society in this scenario before seriousprobems would arrise,

Regarding heat/energy; NORA has 12months supply of oil at current usage with immediate rationing and shuttering of non essential industries, I'm looking at you data centers, we could strech it to 24months. Gas would be a challenge alright but with corib, quick development of bio methane reactor and exteam rationing we could get part of the way their. I also think there is a bit of coal still in the ground down in castlecommer.

Food wise we are fine, massive roll out of back yard veg patches and huge drive for composting, and restrictive use of fertilisers already on shore we can more than feed ourselves.

Water, non issue, literally falls from the sky here is excessive amounts

Security would be the challenge for us, there would need to be a zero tolerance, f about and find out policy. Internment of malcontents and heavy handed approach approach non compliance. We all need to be inthis together and anyone pedeling backwards removed.

Life would be very diferant and not for the better but as a nation we could survive with most of society intact