Columbia Water and Light proposes new generator for renewable energy

1 year 6 months 18 hours ago Friday, February 16 2018 Feb 16, 2018 Friday, February 16, 2018 8:19:00 AM CST February 16, 2018 in News
By: Pat Mueller, KOMU 8 Reporter
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COLUMBIA - Officials with the Water and Light department proposed a new generator that would boost the city's renewable energy output.

The city already has three landfill gas plant generators at the bioreactor landfill. Two were installed in 2008 when the landfill first opened, and the third was constructed in 2013. They make up 1.8 percent of the city's total energy output. Adding the fourth generator would bring that number up to around three percent.

The fourth generator is estimated to cost $1.6 million, but power production superintendent Christian Johanningmeier said Thursday that cost isn't as expensive for the city as it appears.

"Once you take that $1.6 million and divide it over how many megawatts it's going to produce, then it becomes very economically," he said.

Johanningmeier estimates that with the new generator, the landfill will produce upwards of 23,000 megawatts per year. He said the city has a specific methodology to compute the costs for renewable energy.

The city takes the attributes of the renewable energy source and compares them to similar sources in the market. Landfill gas is a base-load type energy source, so as long as there's gas, it will run constantly. The city also has a base-load energy source in coal, and it looks at the cost of that versus the landfill gas. 

"On average, it's very, very close to our base-load resources, so its impact on rates is essentially negligible," Johanningmeier said.

Based on the renewable energy ordinance passed in 2004, 25 percent of the city's energy output needs to come from renewable sources by the end of 2022.

About 15.7 percent of the city's electric portfolio currently comes from renewable energy, according to the Water and Light department. Landfill gas energy accounts for 3.6 percent of the city's energy when you include the output Columbia uses from Jefferson City's landfill. 

Johanningmeier said that down the line, the city will use more wind and solar energy over landfill gas, because those resources are cheaper.

The city council still needs to approve the project. The Water and Light department said it may be ready by the end of 2018.  

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