The RTF continued its exploration of a potential role in supporting the region's demand response (DR) work. As a first step, they focused on developing per unit savings estimates for six specific DR technologies. In the second quarter of 2019, the RTF wrapped up the three remaining technologies, irrigation pump controls, residential water heaters, and refrigeration warehouse controls. The goal was to finish this technical DR work in the first half of the year so that there would be time when developing the next year's work plan to determine how DR will fit in to the RTF’s future work load.
In May, the RTF examined DR for Irrigation Pump Controls. As with previous technologies, this analysis focused on the per unit technical potential of a one-hour event. Specifically for irrigation pump controls, an event would involve shutting down irrigation pumps for that hour and would typically be implemented through an automatic signal by a power line carrier or cellular network. This analysis was approved by the RTF and passed on to Council staff to aid development of supply curves for the 2021 Power Plan.
In June, the RTF addressed the final two DR technologies, Residential Water Heaters and Refrigeration Warehouse Controls. Refrigerated warehouses are an especially great candidate for DR because of their large loads and the flexibility enabled by thermal capacitance and product temperature tolerances. Because of this ease, where DR incentives are available, refrigerated warehouses typically participate in programs. However, the DR potential is very site-specific so the contract analysts had to rely on existing case studies and modeling efforts to estimate typical potential per site as a function of refrigerated space or tons of refrigeration. For residential water heaters the DR impacts represent the amount of input water heating electricity that is eliminated or deferred until after an event is complete. Contract analysts calculated the maximum obtainable per-household impacts from residential water heaters during a DR event, without considering program design and characteristics. Since water heaters do not run 24/7 under any realistic scenario, the impact estimates approved by the RTF include the influence of run times and water draw profiles.
These last two presentations conclude this year’s work on DR. With these six technologies, the RTF was exploring its potential role in supporting the region in DR and the potential for DR to be included in the RTF’s scope of work in future years.