Power has been restored to Belco customers after thousands lost electricity due to a systems failure earlier today.Customers are now being asked to conserve power for the next 24 hours as the compay works to restore generating capacity.Three thousand homes lost power around 9.30am with power restored by about 11am, a company spokeswoman said.A second system fault just after 12pm caused a further 8,000 customers to lose electricity.About 4,000 customers across the Island were without electricity after two load sheds were triggered at Belco's central plant. Electricity was restored to those homes shortly before 3pm.Said the spokeswoman: "Load was first shed this morning at approximately 9.30am when one engine shut down. Power was restored to all of the 3,000 affected customers by approximately 11am. Subsequently, another major engine tripped just after noon, leaving about 8,000 customers without power. About half of these customers had power restored by approximately 1.30pm."Urgent repairs being carried out on other engines caused generating capacity to be "lower than normal" the spokeswoman added."In addition, load on Belco's system has been high for a Sunday, with demand at about 105 megawatts. Belco is asking the community to conserve energy over the next 24 hours, as work continues to restore generating capacity in the central plant."The company extended an apology to those customers who lost power.