RE: 40% of Irish Electricity now coming from Wind Power11 Mar 2021 14:48
Ireland is on a bit of a sticky wicket when it comes to power supply. Our peak electricity demand recently tipped over the 5 GW mark. Demand averaged over every hour of the year stands at 3 GW. As of 2020 we have 4.2 GW of wind power nameplate capacity in the republic, 5.5 GW for the whole island. We have an all-island market for electricity and a second north-south interconnector is planned so it's reasonable to consider both (unless Brexit still has a sting in its tail). The average capacity factor is 30%, although that can run a few per cent lower in a bad year and there can be a few per cent of curtailment. So we have maybe 1.5 GW of supply from wind. Actual supply averaged over the year in 2019 was 1 GW.
Power demand is expected to increase 18% to 41% by the end of this decade according to low and high demand scenarios considered by the transmission system operators (Eirgrid in the republic, SONI in NI). Demand from data centres alone is currently 0.7 GW, but that is expected to rise steeply. With 50 already operating, there are 10 under construction right now. Eirgrid believes that data centres could account for 30% of total demand by the end of the decade. Meanwhile the island is committed to retiring its coal-fired power generation by 2025 -- Moneypoint in Clare has a capacity of over 0.9 GW and Kilroot in Antrim is 0.7 GW (of which 80% is coal and 20% gas). Those two power stations alone provide baseload power equivalent to a quarter of average demand. Kilroot used to provide a third of NI's total consumed electricity. Under the median demand scenario the TSOs consider that Northern Ireland will not be able to meet demand by 2025.
So we have the prospect of significantly increased demand and retirement of significant baseload supply. Can wind power take up the slack? Wind generated 36.3% of Irish electricity in 2020. We regularly have power surpluses which we export. How high can wind penetration get? In Denmark it is 48%. However, Denmark is surrounded by countries that can both take and deliver power pretty much on demand. High wind penetration depends on integrated markets and sufficient quantity of grid storage and spinning reserve. Battery storage is increasingly deployed and can be very successful -- not to mention lower cost -- than natural gas for smoothing out hour-to-hour demand. But daily, weekly, and seasonal grid storage is not an option nor, in my opinion, is it ever likely to be. Chemical batteries have fundamental limitations that simply cannot be overcome. Pumped hydro is a good solution but is geographically challenged. One of the promising things on the horizon is cryogenic air storage which is scalable but only 50% efficient. Green hydrogen, ammonia, and similar options have both efficiency and distribution challenges. Long term grid-scale storage is simply not something we can depend on in the medium term, if ever.
I can't see but that we need to maintain -- if not increase -- baseload supply from natural g