SRC-452

The Serviced Grid Code, Issue 6 Revision 41, effective 5 June 2026 - the revision pack carrying the Connection Conditions and European Connection Conditions

Published claims resting on this source

• CLM-1107 The actual Grid Code figure is not a flat 0.95 power factor at all voltages: the plant must push reactive power out when the grid voltage sags towards 0.9 and absorb it when the voltage rises towards 1.1, and full capability both ways is only demanded in a narrow band around nominal. At part load the requirement is a third of rated power either way, easing on the absorbing side below half load.
• CLM-1108 After the first 140 milliseconds, the rule is a line on a chart: the lower the grid voltage sags, the shorter the time the plant must hold on, from 0.14 seconds near a full collapse out to three minutes at a 15 per cent sag. Then it has to be back to 90 per cent output within a second of the voltage recovering, and stay on for half an hour.
• CLM-1109 The rulebook says the same as the guidance: nobody has to make their inverters behave like a rotating machine, but the grid needs enough plants that do, and it pays for them. If a plant offers it, it must be able to run into a dead network, feed its full rated current into a short circuit for the fault-clearing time, and be tuned within a stated damping range.
• CLM-1210 Britain's grid runs at 50 Hz, normally kept between 49.5 and 50.5 Hz. A power station connected to it, which would include a rectenna, must keep running between 49 and 51 Hz without limit, and for set minimum times further out, down to 47 Hz and up to 52 Hz.
• CLM-1211 Britain's main transmission grid runs at 400 kV and 275 kV, and parts of the 132 kV network in Scotland. On the 400 kV network the voltage normally stays within 5 per cent of its nominal value and never beyond 10 per cent outside abnormal conditions. The rules read do not say how the connection voltage for a given plant is chosen.

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