1. Risk Mitigation 1 W ESTERN E LECTRICITY C OORDINATING C OUNCIL

2. A few additional words about uncertainty The uncertainties mentioned at the outset are not likely to be resolved in the near future. The “Predict -> Act” model that is often used in risk management is not well- matched to the uncertainties associated with climate change. A Robust Decision Making approach is emerging as a preferred alternative in which: – Response options are considered in light of a range of multiple plausible future conditions. – Where possible, flexibility is baked into decisions. – Decisions are intentionally revisited periodically and adjusted, as appropriate, in light of new information about the energy and climate systems. Requires a set of indicators to guide the adaptive management. E.g., – Climate change (to gauge the trajectory): Observed indicators; Updated future estimates (regional differentiation important) – Non-climate drivers: Observed indicators of, e.g., water withdrawals, population, land cover, etc. – Electricity system impacts: Monitoring of each major interdependent system component – Policies and Regulations: Ongoing analysis of how changing policy and regulatory environment affects climate change impacts on reliability 2 W ESTERN E LECTRICITY C OORDINATING C OUNCIL

3. Cross-Cutting Preparation Considerations 3 W ESTERN E LECTRICITY C OORDINATING C OUNCIL Disaster-Related Adaptation Prepare for more weather-related disturbances and emergency responses; update hazard and emergency risk management plans to include climate change Post-Event Analyses of Reliability (PEAR) – i.e., learn from disasters; overlay climate change for a window into the future Pre-plan for post-event climate-resilient reconstruction But, in general, phase major climate-resilient investments with normal replacement cycle

4. Cross-Cutting Preparation Considerations (cont.) 4 W ESTERN E LECTRICITY C OORDINATING C OUNCIL Employ energy smart engineering across or on specific elements within the energy supply chain, e.g.: Consider revisions to engineering standards used to set current system capacity levels that account for the changing conditions Smart metering that has outage notification capabilities, making it possible to pinpoint outage timing and locations more precisely, saving time and money. Automated feeder switches that open or close in response to a fault condition reducing the number of customers affected by an outage Equipment health sensors to reveal possibilities for premature failures Smart microgrids to help to achieve a good match between generation and load Raise the priority of energy demand management. Reduce energy demand by either increasing efficiency or reducing consumption (incentives, education and awareness raising); shift timing of demand to better match generation Promote investment in water efficient systems. Investments and shifts towards less water-intensive generation methods such as dry/hybrid cooling systems for thermoelectric power plants may prove to be viable and cost effective.

5. 5 Explore energy market mechanisms: e.g., power exchange agreements; purchasing from the spot market; options purchasing; Utility commission rate‐setting practices for financing new and higher capacity levels may need to be changed. Pro-actively partner with water management entities in planning for climate change; secure an adequate water supply, suited to the water conditions of the future Improve land use planning and management. – Integrate climate projections into facility planning and site selection processes. – Promote improvements in upstream land use management, including afforestation to reduce floods, erosion, silting and mudslides. – Acquiring land for setbacks that allow space for projected increases in the floodplain. – Secure adequate right-of-ways for increased fire buffering. Cross-cutting Preparation Considerations (cont.)

6. 6 Consider benefits of increases in system redundancy Promote flexibility and adaptability (RDM). Given climate change uncertainty, a flexible and adaptable approach can improve capacity to adjust to new conditions. – E.g., make shorter term resource agreements (e.g., water rights) that don’t constrain options in a different climate; allow design curves to be adjusted on the basis of new information about climate Deal with all hazards in an integrated fashion; do not create stovepiped responses to individual climate change hazards for individual system components. – Protect the entire supply chain – Integrate consideration of climate- and non-climate hazards Cross-cutting Preparation Considerations (cont.)

7. Risk Mitigation – T&D 7 W ESTERN E LECTRICITY C OORDINATING C OUNCIL Transmission line capacity – build additional transmission capacity to cope with increased loads and to increase resilience to direct physical impacts – reduce line capacity requirements by producing a larger fraction of power at or near the destination – place transmission lines underground (also helps with fire and storm damage threats) Substation/Transformer capacity – proactively install new types of cooling and heat-tolerant materials/technology – install cooling systems for transformers – elevate substation control rooms to reduce potential flooding hazards (cont.)

8. Risk Mitigation – T&D (cont.) 8 W ESTERN E LECTRICITY C OORDINATING C OUNCIL Fire threats – increase fire corridors around transmission lines – use transmission line materials that can withstand high temperatures Erosion and flooding threats – create “green” buffers around exposed infrastructure – construct levees or berms to protect exposed infrastructure – elevate or relocate substations – consider extreme event threats in new siting – relocate towers/poles – reinforce towers/poles against flooding High wind threats – reinforce or replace towers/poles with stronger materials or additional supports to make them less susceptible to wind & flood damage Prediction and Monitoring – invest in improvements to short- and medium-term weather, climate, and hydrologic forecasting to improve lead times for event preparation and response – routinely monitor bellweather indicators related to climate, water, and T&D efficiency/costs Planning and design – revise design thresholds using climate change projections – incorporate climate change projections into planning processes

9. Risk Mitigation – Fossil Fuel & Nuclear 9 Increase margin of protection from river flooding and storm surge: Harden and elevate protective structures Invest in “green” infrastructure Build additional generation capacity to account for: Increased customer loads (summer cooling) Increased line losses Decreased generation efficiency Increased weather-related infrastructure damage Retrofit power plants with additional cooling equipment and processes Implement dry cooling technologies in water-limited areas (cont.)

10. Risk Mitigation – Fossil Fuel & Nuclear (cont.) 10 Prepare emergency contingency plans to ensure adequate cooling water to cope with drought conditions and high temperatures, accounting for competing water demands. Ensure adequate backup generation and cooling systems for nuclear power plants facing increased exposure to flooding and other extremes. Explore energy market mechanisms: e.g., power exchange agreements; purchasing from the spot market; options purchasing.

11. Risk Mitigation - Hydropower 11 W ESTERN E LECTRICITY C OORDINATING C OUNCIL Securing adequate water supply – Contracts and contingencies based on an understanding of the hydrologic future that is different than the past – Enhancements to water use efficiencies and conservation (as well as electricity DSM) – Watershed protection to reduce evaporation and silt loading Diversification – New peak generation and purchasing sources for summer months, with declining generation potential and growing summer demand Enhanced operational management – Couple improvements in short-term and seasonal hydrologic forecasting to analyses of long-term climate change to improve management and operational decisions. e.g., to maintain more winter carryover reservoir storage, and reduce discretionary reservoir water releases – Evaluate operational changes (e.g., reservoir rule curve changes) given climate change to optimize energy output, given other constraints and water priorities Infrastructure retrofits – Changes in intake elevation; spillway design – Incorporation of climate change projections into engineering design and planning design specifications that incorporate climate change could enable structures to better withstand more extreme conditions.

12. Risk Mitigation – Other Renewables Engineering Design – Wind: to design turbines and structures better able to handle changing wind speeds and gusts to capture greater wind energy with taller towers, or to design new systems better able to capture the energy of increased wind speeds. – Solar: designs that improve passive airflow beneath photovoltaic mounting structures, reducing panel temperature and increasing power output. Choose modules with more heat-resistant photovoltaic cells and module materials designed to withstand short peaks of very high temperature. Siting – Wind: Choose sites that take into account expected changes in wind speeds, storm surges, sea level rise, and river flooding during the lifetime of the turbines. – Solar: site solar photovoltaic systems where expected changes in cloud cover are relatively low, although this is difficult to accurately predict Improved weather prediction – For wind and solar technologies, it may be possible to improve the reliability of expected output with better weather predictions. 12

13. Risk Mitigation – Other Renewables (cont.) Grid Design – Wind and Solar: network expansion and/or protection to ensure reliability of more intermittent renewables – Wind and Solar: Storage of electrical energy to allow a greater percentage of renewable energy into the grid-- when renewable output is high and the demand low, and generating when renewable energy output is low and the demand high, grid stability can be improved and baseload generation units can operate more efficiently. Storage can also reduce transmission congestion and may reduce or delay the need for transmission upgrades – Consider distributed systems (rather than feeding power into a single part of the grid), which can improve grid stability (although mobile repair teams may be needed to repair damage from extreme events) 13 W ESTERN E LECTRICITY C OORDINATING C OUNCIL