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SAN DIEGO (KGTV) – Another heat wave in the forecast could leave Californians in the dark this weekend. San Diego Gas and Electric is preparing for a hot weekend as high temps are expected to cause more strain on the power grid.Energy officials are hoping to avoid a repeat of last month when rolling blackouts swept through the state for the first time in 11 years.The California Independent System Operator, or CAISO, was forced to order blackouts in response to high demand.“For the grid to operate, demand on the grid needs to be matched evenly with supply,” said Helen Gao with SDG&E.Ahead of the heat this weekend, SDG&E meteorologists are closely monitoring conditions.At this point, CAISO says they haven’t told SDG&E to prepare for rotating outages over the weekend. CAISO says it plans to issue a Flex Alert, which it says is a voluntary call for conservation.CAISO said the recent rotating outages were the result of a number of factors, including generation units being out of service, reduction of the amount of energy California was able to import from other states, and a sudden drop in wind energy.If CAISO issues a flex alert, the power company will activate their demand response programs. It encourages customers to cut back on energy use to reduce strain on the grid. Outages would only be ordered by CAISO as a last resort. On Tuesday, the State Water Resource Control Board took action to prevent more outages in the future. They’re now along four gas power plants to continue operations past 2020. They were set to stop production as California transitions to cleaner energy sources. The extended deadline is expected to ease the strain on current systems while new energy and storage resources are being built.If an outage is planned for a neighborhood, SDG&E says they try to give all customers a heads up before the lights go out.How these rolling outages workRolling outages are a method that CA ISO uses to take the load off of California's power grid. When the state says the grid is under too much stress, each utility in the state has a percentage of electricity that needs to be taken off of the grid to meet whatever wattage CA ISO is aiming for, according to SDG&E. That amount that a utility will be asked to cut during these rolling blackouts is approved with CA ISO regulators every year.SDG&E determines which neighborhoods will be impacted by creating a list of blocks. Each of those blocks accounts for about 25 megawatts of electricity. Once CA ISO tells SDG&E how much power it needs to cut, SDG&E goes down that list from the top, de-energizing blocks until it is told to stop.The next day, the company picks up where it left off on the list, so that the same neighborhoods aren't affected every night. Once SDG&E goes through its entire list, it starts at the top again.Outages can last up to an hour but can also be relatively quick. Saturday, the first block de-energized lasted for about 17 minutes, according to the company.What you can do to helpTo avoid rolling blackouts, officials say the best way is to take energy conservation seriously. Because these outages are issued by the state, conservation is needed by all Californians in these instances.Officials recommend setting the thermostat at 78 degrees, turning off unnecessary lights and electronics, and using appliances before 3 p.m. to help save power.During power shutoffs, SDG&E suggests customers turn off air conditioners, keep refrigerator and freezer doors closed, and reduce their water use due to the need for electricity to pump and process water. For electric vehicle owners, charging should be delayed if possible until after the emergency shutoffs, SDG&E said.SDG&E offers more safety tips to keep in mind during an outage here. 3805

SAN DIEGO (KGTV) – Authorities are investigating a car fire in Spring Valley that may possibly be linked to a fire that scorched part of a La Mesa hair salon less than half an hour before.At around 3:10 a.m. Monday, firefighters and sheriff’s Bomb/Arson investigators were called to the Slay Lounge on 8739 Broadway in La Mesa in response to a fire in a Dumpster.The fire caused some minor damage to the salon and some other businesses at the strip mall.Investigators discovered an object at the scene that may have sparked the blaze.Less than 30 minutes later, crews were called to an import auto car lot in the 9100 block of Campo Road in Spring Valley in response to a car on fire. One car was completely destroyed, and the flames damaged other nearby vehicles. Investigators are trying to determine if the car fire is somehow related to the Dumpster fire in La Mesa. No injuries were reported in either blaze. 921

SAN DIEGO (KGTV) — Border officials seized more than 10 tons of marijuana hidden behind a cargo shipment at the Otay Mesa Port of Entry this week.At about 9 a.m. Monday, an agent with U.S. Customs and Border Protection was inspecting a truck with a manifested shipment of "plastic garment hangers." The vehicle was referred to a secondary inspection where an x-ray machines would continue the inspection.During the secondary inspection, officers detected an anomaly which prompted another examination this time with a canine. The canine alerted officers to the vehicle's trailer, where a search led to 858 plastic-wrapped packages stacked to the trailer's ceiling behind cargo.RELATED:Border Patrol arrests teen with toy car at U.S.-Mexico borderMother tries to smuggle meth with young children in SUV, Border Patrol saysBorder officials say the wall is working, drug smuggling shifting to the seaCBP officers said the packages tested positive for marijuana. There were more than 10 tons of the narcotics, worth about .4 million.The driver of the truck, a 47-year-old Mexican citizen, was turned over to Homeland Security and his B1/B2 visa was canceled, CBP said. The truck, trailer, shipment, and narcotics were seized by CBP.“The ability of CBP officers to interdict contraband at the port of entry is a perfect example of CBP’s efforts to secure our border,” Joseph Misenhelter, Officer in Charge at the Otay Mesa Port of Entry, said. “CBP officers prevented over 10 tons of marijuana from entering our community.” 1529

SAN DIEGO (KGTV) - Authorities are investigating a threat to the San Diego County Administration Center by a former county employee.The specifics of the threat and how it was made was not immediately clear but the threat was being taken "very seriously," Chief Administrative Officer Helen Robbins-Meyer said in a letter to county employees.The employee, who was not named, no longer works with the county.RELATED: San Diego Unified School District, San Diego police outline school safety effortsSan Diego Sheriff's Department was notified, made contact with the person, "and took appropriate action to minimize the threat." Despite this, they asked employees to remain vigilant and report any suspicious behavior."Deputies and security personnel at the CAC are familiar with the subject and are ready to address any concerns."In Robbins-Meyer's letter, she wrote the county is working with SDSO "on every legal means possible to prevent this individual from accessing County facilities." 1011

SAN DIEGO (KGTV) - Bloomberg.com reported Friday that Broadcom Ltd. may take over Qualcomm Inc. for 0 billion.The offer of about per share would likely be made in the coming days, according to the Bloomberg.com report.Qualcomm shares rose Friday on reports of a possible takeover.  301