The UK 's National Grid has revealed the de - rating process for solar and wind , for participation in the Capacity Assessment and the proposed methodologies . Greater levels of data regarding “ long run average contribution ” of weather resources enabled the National Grid to update its notional power curves for onshore and offshore wind for the first time in several years . Wind was given a de - rating of 8.2 % to 9 % , and offshore between 12 and 14.6 % . National Grid said solar However , a paucity of data for solar saw it given a de - rating of 1 % to 2 % , boosted from " almost negligible " by the development of storage technology .
The UK 's National Grid has revealed the de - rating process for solar and wind , for participation in the Capacity Assessment and the proposed methodologies . Greater levels of data regarding “ long run average contribution ” of weather resources enabled the National Grid to update its notional power curves for onshore and offshore wind for the first time in several years . Wind was given a de - rating of 8.2 % to 9 % , and offshore between 12 and 14.6 % . However , a paucity of data for solar saw it given a de - rating of 1 % to 2 % , boosted from " almost negligible " by the development of storage technology .