Siskiyou Power Authority

Hydroelectric power plant

Project Overview Box Canyon Dam was built in 1967 Hydroelectric Power Plant began power generation in1986 The Facility was operated under a Ground Lease Agreement between the Siskiyou County Flood Control and Water Conservation District (District) and Siskiyou Power Authority (Authority), dated March 6, 1984, and the Box Canyon Associates Partnership. This agreement expired in December 31, 2010 Siskiyou County Power Authority took over operations in January 1, 2011. Northbrook Energy was hired for daily operations.

Plant Equipment Project Overview The Power Plant consist of (2) Francis style Horizontal 2.5 Mw Turbines coupled with (2) AC synchronous, 3-phase, 60 Hz, 4160 Volt generators. The Power Plant consists of two Francis style Horizontal 2.5 Mw Turbines coupled with two AC synchronous, 3-phase, 60 Hz, 4160 Volt generators.

The Power The Purchase Power Agreement (PPA) The Power Purchase Agreement between the District (Seller) and Pacific Power & Light (Pacific) was entered into on March 14, 1983 and expires on December 31, 2020.

Power generation

POWER GeneratION RATE Future Power Rates??

Operating revenue and expenses

OUTSIDE CONTRACTOR AND CONSLULTANT COSTS Annual Cost Contract Expires Northbrook Power Management, LLC Operator * $ 268,192 12/31/2020 Triaxis Engineering Operator Support Engineering $ 9,000 6/30/2018 Kleinschmidt Dam Safety and FERC support $ 20,000 *Incudes 4% generation revenue $100,000 estimated for FY16/17

Operator maintenance list Priority Item Description Est. Cost 1 Generator Inspection Winding and bearing inspection, testing, cleaning. Drive coupling inspections add $5k. $15,000 Gen CWS Unit 1,2 - eddy current test and clean generator CWS HEX's. $10,000 Generators Generator VD/PI tests and coil/rotor cleaning $30,000 2 Wicket Gates Inspect and reset to specification using 3rd party hydromech company $25,000 3 Elect Test Relay/Breaker Test, maint., calibrations last done 2014 $20,000 4 HPU Oil removal, tank clean, and oil replacement 5 Spare Parts Review inventory list and define critical spare part needs. Turbines Unit 1 & 2, Turbine shaft seal inepction and replacements. Wear indicated. Inventory Invest in critical spares such as PLC parts, control devices, etc. 6 Routine Maintenance Transformer, bearing, HPU oil analysis, flush cooling water system and generator heat exchangers, etc. $8,000 Dive Dive inspection underwater, up/downstream, intake structure, toe, etc. $50,000 7 Tools Invest is speciality tools such as ultrasonic flow meter, DMM's, vibration monitoring/test equipment, specific hand tools, safety equipment $35,000 Training Infrared Inspection Level 1 using new camera. $3,000 8 Walkway Replace wood walkways with metal grating (a) between the tram and powerhouse, and (b) near the Unit 1 draft tube elbow . $7,000 9 PLC Corrective actions, reprogramming auto, ramp logic, HCV, HWL functionality, full site commissioning, and close out.

County projects SPA Dam Remediate lichen on dam face install snow cleats to prevent avalanches on tram $25,000 Coordinate with Mt. Shasta Fire Department emergency ingress and egress to power plant Unknown Ladders Improve ladder safety $10,000 Log Boom Replace existing log boom $125,000 Tram Option 1 Option 1 includes refurbishment of control system, devices, panels, limit switches, etc., and provision of a nearby 480V power source independent of the plant. $165,000 Tram Option 2 Design and install a new tram system. $400,000 Erosion Repair Stabilize eroded area along the south side of the dam, adjacent to the walkway. $5,000 Rock Stabilization Cliff stability and rockfall analysis. Erosion control and repair near access catwalk at top of dam/parking area. Add $10k. $7,000 Crane Pad [Need previously identified by the County] 60" Bypass Replace/add new controls and install onto PLC control/HMI system. Part of CVO contract, deferred by RA. Security Add security fencing and security cameras, at dam, intertie, parking area. $40,000