Energy shortages are declared by CAISO (California Independent System Operator), the nonprofit agency that manages the state electric transmission system. CAISO balances the supply of electricity from generators inside and outside the State, with the demand for electricity from users. Shortages occur when there is not enough power available to support the needs of residents and businesses throughout California. When demand exceeds supply, or demand is more than the transmission system can move from the generators to your utility, CAISO takes steps to keep the system in equilibrium and avoid grid failures. These steps can include day-ahead Warnings, Alerts, or Stages of Emergency.

• Stage One Emergency: Takes effect when electric generation reserves fall below 7% statewide. The media is alerted and electric consumers are asked to reduce unnecessary consumption.
• Stage Two Emergency: Is declared when reserves drop below 5%. At this level, large commercial customers throughout the State who have contracts to curtail power during high demand are asked to do so. Silicon Valley Power also asks Santa Clara businesses and residents to voluntarily reduce power usage during a Stage Two Emergency.
• Stage Three Emergency: Is initiated when generation reserves fall below one and one-half percent and can result in rolling blackouts among large blocks of electric utility customers throughout California, including Santa Clara.

A Stage Three Emergency alert is serious. If more power generation is not found and/or customers do not reduce energy use enough, the entire electric grid could fail. This would affect everyone regardless of their source of power. Because of this, all utilities throughout the State are required to reduce their energy load during a Stage Three Emergency.

In Case of a Power Alert

Statewide power shortages continue to be a possibility for days with widespread unseasonably hot weather. Although the City of Santa Clara and Silicon Valley Power have sufficient power supply for its customers, we participate in assisting whenever needed.

When shortages occur we ask all customers to help reduce electric demand by acting on some of the following suggestions. Here are some things you can do to help.

Reduce lighting in less used spaces

• Hallways and lobbies
• Office and similar areas
• Flood and night lighting
• Garages
• Bathrooms

Turn off: non-critical equipment

• Office equipment—copy and fax machines, etc
• Computers or at least computer monitors
• Space conditioning (cooling and heating)—Set thermostat to 80 or above, if possible
• Water Coolers
• Advertising signs and display lighting
• Auxiliary and non-critical lighting-indoors and out
• Cafeteria equipment
• Dispensing machines
• Cleaning equipment
• Elevators (minimize use)
• Boilers and auxiliaries
• Water heaters
• Music systems
• Pool and fountain pumps
• Door and gate openers
• Drinking water chillers
• Maintenance and repair equipment
• Reduce use of water (it takes electricity to pump and/or heat water)
• Any other non-critical equipment / appliances

Please delay high energy use activities until after sunset wherever possible during these emergencies.