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Managing Duke Energy Hydroelectric Projects

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Managing Duke Energy Hydroelectric Projects ACCEPTED FOR PROCESSING - 2018 July 27 11:17 AM - SCPSC - ND-2018-19-E - Page 1 of 21 FUTURE ENERGY ENERGY. DUKE SMARTER A July 23,2018 8 PRESENTED BY: PRESENTED BUILDING Hydroelectric Hydroelectric Projects Managing Duke EnergyManaging Duke Public Service Commission of South Carolina Allowable Ex Parte Ex Allowable Carolina South Service of Commission Public Duke Energy Carolinas (DEC) and Duke Energy Energyand Duke Progress(DEC)Duke Carolinas (DEP) ACCEPTED FOR PROCESSING - 2018 July 27 11:17 AM - SCPSC - ND-2018-19-E - Page 2 of 21 2 DUKE ENERGY. 8 1%0 Tagoe - DukeEnergy President, South Carolina Introduction Kodwo Ghartey Kodwo ACCEPTED 1%0 DUKE Hydroelectric reservoirs support regional needs 8 ENERGY. n I I VA v I I I e rttgn vornt FOR vs 0 ga Mountain Area Statesville Yadkin-Pee Dee PROCESSING Ssbs Green River 0 Broad River esville tooncor 0 'a Charlotte - 0 2018 v Matthews Southern tn 'Q July ock Hill, k 53 QM R kinphem 0 I I 27 Lsunnburp 0 11:17 Keowee-Toxaway Catawba-Wateree I AM and Bad Creek t Dillon Nsrtsvrlle 0 - 0 SCPSC Wsrnesvilte Ds Ilrrlpton 0 Newberry Camden ~a~ Dreenwoodnt. Florence - ND-2018-19-E 32 hydro reservoirs enable: . Recreation . Hydropower . Shoreline development . Thermoelectric power . Flood and drought management - . Drinking water . Economic growth Page 3 of 3 21 ACCEPTED FOR PROCESSING - 2018 July 27 11:17 AM - SCPSC - ND-2018-19-E - Page 4 of 21 4 DUKE ENERGY. 8 1%0 DukeEnergy Jeff Lineberger Jeff Presenter Director, Water Strategy and HydroDirector, Licensing ACCEPTED Hydro operations are highly regulated FOR Technical studies Water quality certifications (N.C. and S.C.) PROCESSING Stakeholder agreements Endangered species conditions Legal settlement agreements Fish passage prescriptions License “Ingredients” - 2018 FERC licenses (30-50 years) regulate hydro operations and shape the rivers’ uses July including: 27 11:17 Normal Conditions Drought Conditions Emergency Conditions AM - . Lake levels . Drought protocols . Emergency River Access SCPSC License . Aquatic flows . High Water Events - Requirements . Recreation flows . Grid Emergencies ND-2018-19-E . Recreation facilities . Unexpected Outages . Planned Outages - Page 5 of 5 21 ACCEPTED 1%0 DUKE Regional importance = stakeholder collaboration opportunities 8 ENERGY. FOR PROCESSING - 2018 . Hydro relicensing processes embraced stakeholder collaboration July o 250+ stakeholder representatives 27 11:17 o Hundreds of public workshops AM Independently facilitated teams o - SCPSC o Informed by sound science and engineering . Emphasis on making the rivers better for all interests for next FERC license term - ND-2018-19-E . All stakeholders negotiated relicensing agreements (most signed binding agreements) . End product: Stakeholder-supported “new vision” tailored to meet regional needs - Page “Alone we can do so little; together we can do so much.” 6 – Helen Keller of 6 21 ACCEPTED 1%0 DUKE Managing the extremes 8 ENERGY. FOR Droughts PROCESSING . Drought management advisory groups . Public water utilities, industries, resource - agencies, DEC/DEP 2018 . Shared resource = shared responsibility July . 27 Drives Low Inflow Protocol (LIP) implementation 11:17 and communications . https://www.duke-energy.com/community/lakes AM - . SCPSC LIP is single most important drought management Lake Jocassee at 26.3 feet below full pond on Oct. 6, 2008 tool in the applicable river basins - . “Safety net” for public drinking water, industrial ND-2018-19-E water users, aquatic communities and power generation that never existed before - Page 7 of 7 21 ACCEPTED FOR PROCESSING - 2018 July 27 11:17 AM - SCPSC - ND-2018-19-E - Page 8 of 21 8 DUKE ENERGY. 8 1%0 Herrin DukeEnergy Randy Randy Presenter Vice President,Vice Carolinas Regulated Renewables ACCEPTED 1%0 DUKE Hydropower is the original renewable energy source ENERGY . 100+ years of clean, renewable hydropower FOR . 5.2 million MWh of electricity produced in 2017 by PROCESSING DEC and DEP hydros combined . Provides flexible and dispatch-capable energy to customers - 2018 July Catawba hydro, circa 1904 (replaced by Wylie hydro in 1925) 27 11:17 AM - SCPSC - ND-2018-19-E - Page Great Falls hydro Cowans Ford hydro 9 of 9 21 ACCEPTED 1%0 DUKE Storing energy and integrating renewables ENERGY FOR . Bad Creek and Jocassee pumped storage PROCESSING hydros have reversible generating units o Generate to meet electric demand o Pump water back uphill to store energy - 2018 o Tremendous grid support . Pumped storage hydro helps add other July renewables, like solar, to the grid 27 11:17 . DEC is adding approximately 335 megawatts to Bad Creek Pumped Storage Station Bad Creek over the next five years AM - SCPSC - ND-2018-19-E - Page Jocassee Pumped Storage Station 10 of 10 21 ACCEPTED 1%0 DUKE Managing the extremes 8 ENERGY. FOR Floods PROCESSING . Every storm is unique . Fundamentals: Prepare - o 2018 o Predict and store runoff July Systematically release water o 27 11:17 o Minimize safety/property risks o Communicate AM - SCPSC - ND-2018-19-E - Page Lake with gated spillway: Lake with ungated (overflow) spillway: Full pond (100 feet) = top of spillway gates Full pond (100 feet) = crest of spillway 11 of 11 21 ACCEPTED 1%0 DUKE High river flows 8 ENERGY FOR Lakes with ungated (overflow) spillways PROCESSING . When there is more river flow coming into the lake than can be passed through the powerhouse, the lake level rises above the crest of the spillway and flows over the top. - 2018 . The lake level will be higher than full pond for the remainder of the storm event. July 27 . The simple, effective design of an open spillway allows 11:17 large volumes of excess water to move downstream. AM - SCPSC - ND-2018-19-E - Page Wateree Hydro Station and dam 12 of 12 21 ACCEPTED 1%0 DUKE High river flows 8 ENERGY FOR Lakes with gated spillways PROCESSING . DEC and DEP will not allow water to spill over these gates since trash or floating debris could impact gate operability. - . When there is more river flow coming into the lake than 2018 can be passed through the powerhouse, spillway gates are opened to pass the extra flow. July 27 . A gated spillway consists of manually and automatic 11:17 operated floodgates that are tested on a routine basis. AM - SCPSC - ND-2018-19-E - Page Tillery flood gates 13 of 13 21 ACCEPTED 1%0 DUKE Subtropical Storm Alberto 8 ENERGY. FOR Catawba-Wateree focus PROCESSING . Region received significant amounts of rain, including in the Upper Catawba River Basin . This storm followed a wet April and May – soils - were already saturated and lakes were above 2018 normal seasonal targets July . Prior to Alberto, DEC was lowering lake levels to 27 their normal seasonal targets 11:17 . Throughout the storm and the related high inflow event, DEC coordinated closely with local AM - emergency response officials SCPSC USGS: United States Geological Survey . Updated lake information was posted on the - DEC toll-free phone system (800.829.5253) and ND-2018-19-E website: www.duke-energy.com/community/lakes - Page 14 of 14 21 ACCEPTED Subtropical Storm Alberto Catawba-Wateree focus FOR • Reservoir storage in NC (e.g., Lakes James and Norman) mitigated impacts to SC reservoirs • Lake James rose to about 3.5 ft. over full pond and Lake Norman was at 100 ft. and rising (very rare) PROCESSING • Lake Wateree did not begin to rise and spill until after Lakes James and Norman storage was filled Catawba-Wateree Reservoir Levels - 106.0 2018 Alberto 104.0 July 102.0 27 11:17 100.0 AM 98.0 - SCPSC 96.0 94.0 - ND-2018-19-E 92.0 Lake James Lake Norman Lake Wateree Full Pond Elevation - Page 15 of 15 21 ACCEPTED After a high-water event FOR Catawba-Wateree focus PROCESSING . DEC is required by our FERC license1 and Comprehensive Relicensing Agreement2 to lower reservoirs back to their seasonal target levels. This means moving water downstream through the 11-reservoir system for days. - . Spilling at reservoirs with no flood gates (about one foot over full pond) expedites returning lake levels to 2018 normal and prepares for future rain events. July . Lake Wateree, the most downstream reservoir, has to pass all the high water from all 10 upstream 27 reservoirs, which takes days. 11:17 AM - SCPSC - ND-2018-19-E 1FERC License: https://www.duke-energy.com/_/media/pdfs/community/lakes-and-rec/ferc-order-new-cw-license-11-25-2015.pdf - 2Comprehensive Relicensing Agreement: https://www.duke-energy.com//_/media/pdfs/community/comp-relicensing-agreement.pdf Page 16 of 16 21 ACCEPTED Lake Wateree FOR Past and future PROCESSING . Over the past 15 months, Lake Wateree has spilled two other times with both of those times being less than one foot over full pond. Modifications to the Wateree spillway are scheduled for completion by March 2026 to increase flow release - capacity by 10,000 cfs (nearly 75,000 gallons per second = over 400 Olympic-sized swimming pools per hour). 2018 July Lake Wateree Lake Level 27 102.00 11:17 101.00 100.00 AM 99.00 - SCPSC 98.00 97.00 96.00 - 95.00 ND-2018-19-E 94.00 93.00 92.00 - Lake Level ft. (local datum, 100 ft. = Full Pond) = Full 100 ft. datum, (local ft. Level Lake Page Actual Lake Level Full Pond Elevation 17 of 17 21 ACCEPTED Myth versus truth in managing Catawba-Wateree floods FOR Myth: DEC manages flooding events differently on the North Carolina lakes (e.g., Norman) than the South PROCESSING Carolina lakes. Truth: Management fundamentals are exactly the same. Differences from lake-to-lake arise from lake-specific factors (e.g., gated v. ungated spillways, location/amount of the rainfall, shoreline topography, etc.). - 2018 July Myth: These lakes were designed for flood control, but DEC doesn’t operate them that way.
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