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Guest opinion: Closed landfills may house solar farms

Source: 
Sequim Gazette

Solar power is getting a lot of attention these days as our country strives to reduce greenhouse gases.

Sunny cities like Honolulu, Los Angeles and San Antonio have ramped-up solar power production; however, in cloudy coastal municipalities such as Seattle, investments in "sun power" have been lagging.

One reason is Washington state is blessed with an abundance of low-cost and carbon-free hydropower which accounts for three-fourths of our electricity generation.

Electricity from the Columbia River system provides families, businesses, industries and public customers with some of the lowest electric rates in the world. Meanwhile, ratepayers in Hawaii have electric bills which are eight times higher than ours.

The cost for electricity from other renewables is dropping.

According to Forbes, "hydroelectric power is the cheapest source of renewable energy, at an average of $0.05 per kilowatt hour (kWh), but the average cost of developing new power plants based on onshore wind, solar photovoltaic (PV), biomass or geothermal energy is now usually below $0.10/kWh."

Wind has been the primary focus of new renewable investments in Washington, particularly along the Columbia River east and north of Goldendale. However, the intermittent nature and the vast amount of land required for wind and solar have been problems.

That is changing as well.

Lots of investments are going into new battery storage technology which benefits wind and solar. New utility-grade lithium storage batteries are coming on line. Tesla is one of the companies developing those batteries which can store electricity when the wind blows and the sun shine.

In the past, land costs for wind and solar has been a disadvantage, but that is changing.

"Solar panel installations have been one of the fastest-growing types of energy infrastructure in recent years and landfills have become fitting sites due to the sheer amount of land required," WasteDive's Matthew Bandyk wrote in his May 26 post.

According to EPA, Washington has more than 60 landfills of which 40 are closed. They are packed with our trash and many of them are largely unproductive ground.

Closed landfills could be outfitted with banks of solar panels to create electricity and utility-grade batteries would be added to store it. The panels would charge batteries when the sun is shining, and then dispatch that energy at night or in cloudy weather.

The added benefit is the money from the sale of electricity could generate revenues for municipal governments which own most of those abandoned dumps. Funds could offset maintenance expenses used to control leaching contaminated water and escaping methane gases.

In our state, where replacing greenhouse gas producing power plants is a priority, solar generation is also getting more attention. If old landfills were available for solar projects, it may increase their viability.

New Jersey's largest utility coupled 1,764 solar panels to generate power with 2,000-Tesla batteries to store it and reduce power fluctuations. The project sits on top of a closed municipal landfill.

"Developing this solar storage project on a closed landfill allow us to take space that was otherwise and return it to a productive role," Public Service Electric and Gas (PSE&G) spokesperson Fran Sullivan told WasteDive. The company is looking to expand to other closed landfills and generate enough electricity for 1.6 million homes (2,000 megawatts) by 2030,

As Washington's population grows, the demand for electricity increases as well. Power planners also need look to replace a large load from the Centralia coal-fired power plant which is scheduled to completely shut down in 2025.

The bottom line is our electric supply system will change and hopefully, we can include solar generation atop of barren unproductive garbage dumps in our strategy.

Don C. Brunell is a business analyst, writer and columnist. He retired as president of the Association of Washington Business, the state's oldest and largest business organization, and now lives in Vancouver. He can be contacted at theBrunells@msn.com.

 

Discussions

John Benson's picture
John Benson on Jun 5, 2020 7:10 pm GMT

Good post.

An added thought: closed (and open) landfills frequently need to prevent potential methane emissions that result from anaerobic decomposition of garbage from escaping to the atmosphere. This powerful greenhouse gas is extracted from the decaying garbage via wells, but what happens to it next. Methane has a global warming potential 104 times greater than CO2 in a 20-year time-frame, but only 28 times in a 100-year time-frame. As methane degrades it forms CO2.

The following are potential methods of disposing of this methane.

Flaring (burning) it, which immediately converts it to CO2

Purifying it to meet pipeline standards and injecting it into natural gas (a.k.a. methane) pipelines.

Producing electricity with it via microturbines or fuel cells.

The last could be used to supplement battery energy storage systems that are used to mitigate photovoltaic array variability. This might reduce the amount batteries that would be required.

-John

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