Pumping – Generating Plant
This SVS-led Value Planning study was conducted to develop a path forward on a generating plant that ceased to be able to generate power or to utilize the pumpback capability after the plant sustained heavy damage from a fire. Because of the contamination, under an emergency contract, all of the equipment, exclusive of the power generating equipment was dismantled, decontaminated, and either disposed of or reinstalled. The purpose of the value planning workshop was to identify viable alternatives for the plant beyond the required cleanup and decontamination. Specifically, the Value Team was tasked with making a business case for rehabilitating or decommissioning the power generation capability of the plant. The team developed multiple scenarios and developed long term economic analysis of each.
Rehabilitation of a 100-Year Old Hydro Plant
SVS provided value planning services and a constructability review on this project to expand the nearly 100-year old hydroelectric station from its current generating capacity of 35 MW to 60 MW. The project includes:
- expansion of the intake structure to 8,000 cfs
- construct a new power canal and steel penstock to feed the generating unit
- replacement of the existing surge pond for the generating units with new surge capabilities incorporated into the open canal
- a new powerhouse located downriver of the existing powerhouse
- one new 60 MW Kaplan turbine
- a new tailrace
- a new GSU transformer and new emergency start-up power equipment
Upstream Control Plant Feeding Multiple Hydropower Plants
In order to meet FERC requirements, this 100-year old intake structure is undergoing a seismic upgrade. The structure is 47 feet wide and 72 feet tall with four bays that discharge into a 12 foot diameter wood stave pipe. Each bay is isolated from the reservoir with a stoplog wall. The project was to infill the two end bays with concrete and use post-tensioned tendons to anchor the mass concrete blocks. Due to a stoplog failure and two month uncontrolled release prior to the implementation of the seismic upgrade, the first priority was to ensure there would be no subsequent failure.
Several options were being considered for both flooding and de-watering the structure, both in-the-wet and in-the-dry options. The value study identified additional alternatives using float-in and precast/prefabricated concepts that would result in a new intake structure for a 45% to 60% savings in construction cost.
New 290 MW Hydropower Facility in South America
This 290 MW hydroelectric development project includes five high mountain river diversions, 33 km of 3.8 m to 4.5 m diameter tunnels, two 4 m diameter vertical shafts extending up to 900 m, 4 m diameter steel penstocks feeding four turbine/generator units in a surface powerhouse. Because the tunnel diameters were being driven by constructability, not hydraulics, the value team provided recommendations that would allow a reduction in size. The team also suggested moving the powerhouse underground for better protection from rock falls and avalanches. By the end of the study the value team generated savings totaling over $70 million.
Diesel Generated Power Plant
This $100+ million Power Plant Upgrade project includes the selective replacement and upgrade of utility services plus introduction of new utility services to utilize waste heat generated by this 24 MW diesel generated Power Plant located in a developing country where fresh water is a scarce commodity. In addition to providing immediate construction savings, the value team proposed operational improvements that provided a more efficient means of operating the chillers and distributing hot water reducing the long term operational costs for this country.