Power grid operator IPTO is examining a number of factors concerning periods that combine low domestic electricity demand with high RES production, the most recent example being the March 25-26 weekend, in order to decide on an optimal formula protecting the grid’s security and stability.

Net-export periods limit the need for extraordinary measures, while, on the contrary, net-import periods require far greater caution.

Getting the balance right for an optimal formula regarding RES contributions to the grid is far trickier when high RES output primarily stems from abundant sunshine. Under such conditions, significant proportions of green-energy injections are provided by small-scale PV units not detectable by DEDDIE/HEDNO, the distribution network operator, as a result of the grid’s shortage of telemetrics, which offer automatic measurement from remote sources. If the grid were equipped with sufficient telemetrics, the operator’s task of intervening accordingly to get the balance right would be made simpler.

Conditions combining low electricity demand and high RES production are a new reality that will continue to exist for many years, until energy storage technologies have matured sufficiently and become an integral component of the grid.

Until then, IPTO must – and already has – deploy solutions such as limiting both electricity imports and RES output injected into the grid. For the time being, grid-injection limits on RES producers are being imposed universally and proportionately.