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REDDING ELECTRIC UTILITY I THERMAL ENERGY STORAGE REDDING SHIFTS PEAK AC DEMAND...WITH ICE proved temperature balance and no compromise Redding Electric Utility (REU) embarked on a pilot in occupant comfort. program designed to shift peak demand, improve REU HAS INSTALLED TEST UNITS AT TWO RESIDENCES. The its utility's load factor, and reduce overall energy first is Habitat for Humanity's new Clover Creek costs for customers. By developing thermal energy Preserve Caretaker's Cottage. A donated ranch storage (TES) systems with commercial, direct ex- house was moved to the Clover Creek Preserve and pansion air conditioners (DX/AC), REU has the completely remodeled to meet REU's Earth Advan- potential to shift AC-driven load from on-peak to tage green building program standards.The cottage off-peak hours. includes a 3 kW solar photovoltaic system, a 3-ton DX-based TES systems use the AC compressor to make TES system, and many other energy efficiency im- ice during the off-peak hours. During the utility-de- provements. According to REU, the system has fined, on-peak period, the DX/AC systems' refigerant shifted approximately 3 kW of on-peak demand to is passed through a coil in the ice using the tempera- off-peak hours. ture differential to condense the refrigerant—rather IN AUGUST OF 2006 A RESIDENTIAL PROTOTYPE WAS IN- than using the compressor to condense the refrigerant. STALLED AT THE HOME OF REU DIRECTOR JIM FEIDER. The These systems will typically reduce peak demand con- system has provided excellent cooling and peak- sumption by more than 90% and lower total energy shifting performance:4.6 kW of demand is reduced use by 10%or more. to 300 watts during peak hours.The prototype used REU currently has seven TES demonstration/pilot proj- in this demonstration project confirmed TES perfor- ects in operation throughout our service territory: mance in a residential deployment.A new size and shape model is under development that will easily integrate with new and existing homes. Thin S d O THE REDDING COMMUNITY'S LONG AWAITED NEW LI- BRARY(55,000 SQ FT)OPENED IN MARCH OF 2007.A TES unit is used to supplement the 110-ton chiller op- eration during afternoon peak periods (sometimes notc h a n e • referred to as partial peak shift). This combination of equipment is projected to reduce kW demand by nearly 200 kW, or 40%compared to a non-TES, we change. refrigerant-based air conditioning system. The City of Redding has also partnered with the de- veloper of a new 75,000 sq ft commercial office building to incorporate a TES system similar to the THE FIRST TES PROJECT WAS A RETROFIT AT THE REDDING library's, but with a larger 170-ton chiller and 6 ice MUNICIPAL AIRPORT. The system was designed to storage tanks. completely turn off the 90-ton chiller during the peak afternoon hours and rely solely on the melt- Based on the positive results of TES installations to ing ice in the three storage tanks. Reportedly, the date, REU will continue to monitor the TES system as building has a more stable, comfortable tempera- a potential complement to REU's resource portfolio. ture level with the addition of the TES system. Redding Electric Utility believes the Redding market is an ideal candidate for small commercial and residen- REU INSTALLED TES UNITS AT TWO FIRE STATIONS. Over- tial installations and that TES programs will become a all, the peak demand reduction at each station vital part of its resource mix in years ahead. was 95%, with an energy savings of 18%, im-