A Holycross dairy farm runs 29.8 kWp of solar and a 45 kWh battery - one autumn day is priced at about €9.92, the system price is blank, and the three-year line is the installer's expectation
On 29 October 2026 the Connacht Tribune published a contributor note on a 110-cow farm near Holycross, Co. Tipperary. ProSolar's system is 59 panels, 29.8 kWp, a 15 kW inverter and a 45 kWh battery. The note prices 30 September at about €9.92 after export, against about €34.42, and expects payback in three years or less after grants. It does not print the system price, the unit rates, the farmer's name, or the year on the 16 June switch-on.
A milking shed draws power at the morning milking and again in the evening. Panels make power in the middle of the day. A battery is the box that holds one for the other. The note on this farm prints the box size and one day's arithmetic. It does not print the price of the box.
On 29 October 2026 the Connacht Tribune published a contributor note, by Ciara Collins, on a 110-cow dairy farm near Holycross, Co. Tipperary. The farmer is not named. The page says a two-monthly electricity bill sat at about €2,500, and the most recent one was €500, with most of the power still bought from the grid on the night rate. The night rate in cents is not on the page.
The hardware, in the page's words. Installer ProSolar, which the page calls SEAI-registered. A Sigenergy SigenStor system. 59 panels, 29.8 kWp, on a corrugated metal shed roof. The inverter is 15 kW and single-phase. The battery is 45 kWh. 45 kilowatt-hours divided by 15 kilowatts is 3 hours at full push. The page does not print the hours. The panel peak is 29.8 kW and the inverter is 15 kW, so the roof can be making more at noon than the inverter can pass. The page does not discuss that gap. Single-phase is the supply the page names. A factory on a three-phase supply is a different connection.
How the page says the day runs. Milking is around 8am and around 6pm, with little load in between. The battery charges overnight on the night rate and covers the morning milking and the milk cooling. The panels refill it through the middle of the day. Surplus is exported and paid by the supplier. The export cents are not printed.
One day, 30 September. The page does not print the year. The farm used 110 kWh and bought 2.9 kWh at the day rate. The page prices that day at about €9.92 after export income, against roughly €34.42 without the solar, a difference of about €24.50. It says the figures are on unit rates and does not print the rates. €34.42 minus €9.92 is €24.50. That subtraction is ours. The page also says the system saves the farm more than one cent for every litre of milk over the year. It does not print the litres, so a euro total for the year is not on the page.
Since switch-on on 16 June. The page does not print the year. It says the system has generated around 12,000 units, 16% above expectations, and the battery has supplied 5,660 kWh, mostly into the early-morning and evening milking. The expected generation, the number the 16% sits on, is not printed. On an Irish electricity bill a unit is a kilowatt-hour. The page uses "units" for the 12,000 and "kWh" for the day's use, and it does not print a line that says they are the same measure.
Share used on site. ProSolar projects the farm would use only about 35% of its solar output without batteries. With the battery, the page says the farm has used 76% on site. 35% is a projection. 76% is the page's report of what has happened. The kilowatt-hours under each percent are not printed.
Payback. ProSolar expects three years or less after grants, on a system designed to last 20 years. The system price is not on the page. A count of years, with no euro cost beside it, is the installer's sentence. The page says costs and savings vary with the farm, and that output is lower in winter.
Three public price pages sit beside this bill. They are not this bill. Teagasc's farm-income outlook puts average dairy farm income in 2026 at approximately €78,000, down 49% from €153,319 in 2025. That is an average across dairy farms. It is not this herd. The CSO's wholesale price release of 22 September 2026 says wholesale electricity was 76.9% higher in August 2026 than in August 2025, and 9.6% higher than in July 2026. In the CSO table that electricity line sits with fuels purchased by manufacturing industry. A two-monthly farm invoice is a different piece of paper. Bord Gáis Energy's notice raises residential electricity unit rates by 9.1% from 9 October 2026, and residential electricity standing charges by 7.2%. The Tribune prints the 9.1% and does not say residential. The supplier's page does. A farm contract is a different tariff. The Tribune also says an SSE Airtricity increase was announced days earlier and does not print the percent.
The grant line on the contributor page. It says the SEAI Non-Domestic Microgen Grant has doubled for new applications made from 6 October 2026 to 6 July 2027, and that it now rivals the TAMS 3 solar grant with less paperwork. It does not print the euro grant on this shed. The grant note already on this desk says the cheque is for the solar, for new applications in that window, and that there is no separate business battery grant in it. A 45 kWh battery sits outside that cheque. The business-price note puts the first-half 2026 average for business electricity at 24.1 euro cents a kilowatt-hour, before VAT. This farm page does not print its own cents.
Analogy: 45 kWh is the tank. 15 kW is the tap. Three hours is the tank divided by the tap. The euro price of the tank is not on the label. One autumn day's €9.92 is one day, and the unit rates are left off the label.
Good: A named county, a herd size, a named installer, panel kilowatts, inverter kilowatts, battery kilowatt-hours, a switch-on day, and one dated day's energy and euro arithmetic.
Bad: The farmer is unnamed. The system price is blank. The unit rates are blank. The year on 16 June is blank. The expected kilowatt-hours behind the 16% are blank. The litres behind the one-cent line are blank. 35% is a projection. The three-year line has no cost beside it. The €2,500 and the €500 are "about", on a contributor page. The 9.1% on the supplier's page is a residential rate.
Ugly: Treating €9.92 as every day of the year. Treating the 76.9% wholesale move as this farm's bill. Treating the residential 9.1% as the milking-shed contract. Treating three years as a measured payback. Adding a battery grant the page does not print. Reading 29.8 kWp as if the 15 kW inverter can pass all of it at once.
Soft next step: set 29.8 kWp, 15 kW and 45 kWh beside the system price, and leave the three-year line off until that price is printed.
Source: Connacht Tribune, Ciara Collins, 29 Oct 2026, 11:14 - dairy farm solar and battery near Holycross. Primary for the contributor note, the 110-cow herd near Holycross, Co. Tipperary, the unnamed farmer, the two-monthly bill of about €2,500 and the most recent bill of €500 with most remaining grid power on the night rate, ProSolar as an SEAI-registered installer, the Sigenergy SigenStor system, 59 panels, 29.8 kWp, the 15 kW single-phase inverter, the 45 kWh battery, the corrugated metal shed roof, milking around 8am and 6pm, overnight charging on the night rate, export of surplus, the 30 September figures of 110 kWh used and 2.9 kWh bought at the day rate, about €9.92 after export against roughly €34.42 and a difference of about €24.50 on unit rates that are not printed, the claim of more than one cent a litre with no litres printed, switch-on on 16 June with no year printed, around 12,000 units and 16% above expectations with the expected figure not printed, 5,660 kWh supplied by the battery, the 35% projection and the 76% on-site figure, the expectation of payback in three years or less after grants on a system designed to last 20 years, the absence of a system price, the SEAI and TAMS 3 sentences with no euro grant for this shed, and the SSE Airtricity sentence with no percent. 45 kWh divided by 15 kW, and €34.42 minus €9.92, are our arithmetic. The page does not print those divisions. Teagasc - farm income outlook for 2026. Primary for average dairy farm income of approximately €78,000 in 2026, down 49% from €153,319 in 2025. That is an average. It is not this farm. Central Statistics Office, 22 Sep 2026 - Wholesale Price Index, August 2026. Primary for wholesale electricity 76.9% higher in August 2026 than in August 2025, and 9.6% higher than in July 2026, in the table of fuels purchased by manufacturing industry. Bord Gáis Energy - residential electricity and gas price change from 9 Oct 2026. Primary for the 9.1% rise in residential electricity unit rates and the 7.2% rise in residential electricity standing charges from 9 October 2026. The Tribune prints 9.1% and does not say residential.