Lesser operational curtailments were triggered for lower magnitude and peak ground velocity thresholds. The same possible curtailments and alterations never apply to proper exclaves. Deletions consist of "beheadments", "curtailments", and "internal deletions". Excess generation when not needed may force curtailments, thus increasing the price of electricity generated. Various curtailments of winter service were tried over the following years to reduce operating costs. The Bank's Board of Directors voted unanimously in July to end all curtailments. On December 2, 2018 Notely announced the Alberta government would be instating oil production curtailments.