Aspen: City and area residents debating the benefits and possible streamflow loss of proposed hydroelectric facility

From the Associated Press via The Aspen Times via the Grand Junction Free Press:

City officials are taking public comments on the proposal and say a more comprehensive review is possible if there is enough concern or there are issues they haven’t considered. Aspen wants to build a 1,880-square-foot hydropower plant that would draw water from Castle and Maroon creeks to generate electricity. The 1.05 megawatt plant is expected to increase production of electricity by 5.5 million kilowatt hours annually. That would provide energy for several hundred households. City officials say getting that much electricity from a renewable source would eliminate an estimated 5,167 tons of carbon dioxide emissions from coal-fired power for a 0.6 percent communitywide decrease.

Some area residents, however, are concerned about the potential effects on wildlife and water rights if too much water is diverted from the creeks. Paul Noto, an Aspen-based water attorney, who represents several residents who live along Castle Creek, said if Aspen touts itself as an environmental leader, it ought to submit the project to a full environmental review.

More hydroelectric coverage here and here.

Aspen: Recap of public meeting for planned hydroelectric installation on Castle Creek

From The Aspen Times (Carolyn Sackariason):

Nearly two dozen people attended a public meeting held Friday concerning the Castle Creek Hydroelectric Project. City officials, paid consultants, hydrologists and aquatic biologists were on hand to explain the project and answer questions about the project. The purpose of the meeting was to determine whether the city should circumvent a full environmental review through a permit process with the Federal Energy Regulatory Commission (FERC). As it stands now, the city plans to apply for what’s known as a “conduit exemption,” which wouldn’t require a full-blown environmental review. But the city’s public works director Phil Overeyender said if public comment, which will be taken for the next 60 days, raises enough concern or potential effects that the city hasn’t considered, a full environmental review could be possible.

More hydroelectric coverage here and here.

Energy policy — hydroelectric: Aspen’s Castle Creek hydroelectric generation station update

Nearly three years ago Aspen residents approved bonding to fund a hydroelectric generation station on Castle Creek in town. Here’s an update on progress towards building the facility, from Carolyn Sackariason writing for the Glenwood Springs Independent. From the article:

John Hines, the city’s renewable energy utility manager, said the 1,880-square-foot facility will go through public review for final approval starting next month. If it’s approved by the Aspen City Council, construction could begin as early as the spring…

There has been minimal opposition to the facility, but some people are concerned about a decreased flow in the nearby stream because water will be drained out of it to generate power. Hines said the city will host a neighborhood meeting after Labor Day in which a hydrologist and an engineer will address water-flow concerns. He added that neighbors are generally in favor of the facility but are watching the design of it closely. “They are in favor of the hydro facility, but they want it done right; I don’t blame them,” Hines said.

A new water line is being built to replace the old one, as well as to accommodate the new plant, which will generate renewable energy for the city and increase its supplies by 8 percent over its current level of about 75 percent. The project would utilize existing water rights, head gates, and water storage of the original Castle Creek hydroelectric plant, which met all of Aspen’s electric power needs from 1892 through 1958, when the plant was decommissioned. When completed, the 1.05 mega-watt facility is expected to increase electric production by 5.5 million kilowatt hours annually.

City officials say that switching from primarily coal-fired energy purchases to hydroelectric power production would eliminate an estimated 5,167 tons of CO2 emissions — representing a 0.6 percent community-wide reduction in carbon emissions based on the 2004 greenhouse gas emission inventory.

The facility’s turbine and generator will be designed to convert the force of falling water into electric power. The water comes from the Thomas Reservoir, which is located at the top of Doolittle Drive and is the home of the water treatment facility. The water will travel down a 42-inch pipe, supplying the hydro plant with approximately 52 cubic feet per second. There are nearly 4.9 million gallons of water sitting above some residential areas and the hospital. The pipe would allow the city to quickly evacuate the water should the walls of the reservoir ever be breached. The electricity will be placed on the city’s grid and taken up to the water treatment campus to power those facilities, and to potentially produce hydrogen for hydrogen fuel cells and hydrogen vehicles.

More hydroelectric coverage here and here.

Energy policy — hydroelectric: Aspen’s new Castle Creek plant

Here’s a letter to the editor — running in the Aspen Times — written by Phil Overeynder, Utilities and Environmental Initiatives Director, City of Aspen, explaining the benefits of the new hydroelectric plant approved in 2007 by Aspen voters, along with the City’s committment to instream flow in Castle Creek:

In the near future we plan to provide additional information about this important and environmentally responsible project. What Aspenites gained in approving this project on the 2007 ballot is the annual production of 5.5 million kilowatt-hours of environmentally responsible electricity. That power production will prevent more than 5,000 tons of carbon dioxide from entering the atmosphere every year. This represents more than 25 percent of the remaining carbon emissions resulting from power generation for Aspen’s electric utility.

The production of clean, renewable energy at the Castle Creek Hydroelectric Project will depend on the use of water drawn from Castle Creek. There is simply no way around this basic fact. However, the city is doing its best to limit the impact on Castle Creek. The only change the hydroelectric project will make in the city’s water use regime is that a portion of the water diverted by the city will return to the creek at a point approximately three-fourths of a mile downstream of the present point of return, which is below Thomas Reservoir. The new point of return will be at the Castle Creek Bridge.

From the beginning of the Castle Creek Hydroelectric Project, the city of Aspen has been aware of the critical importance of maintaining a viable, healthy stream in Castle Creek. The Colorado Water Conservation Board’s (CWCB) decreed instream flow right for Castle Creek is 12 cubic feet per second (cfs), and is decreed for the purpose of protecting the natural environment.

This is a fairly junior water right. To help assure that Castle Creek actually receives this instream flow, which applies to all of Castle Creek, the city has already voluntarily committed to operate its own, more senior, water rights in a way that will support the 12 cfs instream flow. The city currently honors this commitment, and the proposed Castle Creek Hydroelectric Project will not alter this commitment. This means it is possible that, under certain conditions, the flow in Castle Creek upstream of the hydroplant will be 12 cfs. Historical low stream flow conditions in Castle Creek (generally reaching the lowest values in late winter) have averaged in the range of 20 cfs. When the hydroplant is operating in times of low flow in Castle Creek, flows in the reach of the creek between the hydroplant intake and the plant may be reduced to 12 cfs instead (the value established by the CWCB as necessary to protect the natural environment).