Ireland and Northern Ireland · live · the fleet · the plan, the instruction and the meter

Reading the week.

Who decided each half hour, battery by battery

One row is one battery and one column is one half hour of the week. Pale is a half hour at nought, grey is the battery running to its own plan, blue is the control room moving it off that plan, and a dark tick is a half hour whose meter departed from the instruction. The figure on the right is the share of the week the control room moved it. Click a row to open that battery’s week.

Order:

Reading the week.

at nought its own plan moved off its plan by the control room meter departed from the instruction

A half hour counts as at nought, as following, or as moved when the two figures compared are within 1 MW of each other, or 5% of the battery’s registered capacity where that is larger. Every figure is an average over the half hour, so a battery holding frequency response, which charges and discharges in small amounts around nought as the frequency moves, reads as at nought here: those half hours are when it is standing ready, not when it is idle. A battery providing response is also expected to depart from its instruction when the frequency moves, so a tick is not by itself a fault.

The same week as a table

Shares are of the half hours where all three figures are published. Energy is summed over the week. Click a column to sort.

Final physical notifications, dispatch instructions and daily meter data from SEMO, saved daily because SEMO keeps them for about two months. The plan is the unit’s final physical notification, straight lines between the points it filed; the instruction is the control room’s set point, held until the next one; the meter is the energy recorded over the half hour. Each is averaged over the half hours of the Irish day. Supported by EirGrid Group Data, under the EirGrid Group open data licence.