Hickory Ridge Landfill

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Hickory Ridge Landfill
Hickory Ridge Landfill Completed.jpg
Photo of completed project taken on 9/23/2011. Atlanta can be seen in the background.
Hickory Ridge Landfill is located in Georgia (U.S. state)
Hickory Ridge Landfill
Location of Hickory Ridge Landfill
Country United States
Location Conley, Georgia
Coordinates 33°39′54″N 84°20′06″W / 33.66500°N 84.33500°W / 33.66500; -84.33500Coordinates: 33°39′54″N 84°20′06″W / 33.66500°N 84.33500°W / 33.66500; -84.33500
Status Operational
Construction began 6/1/2011
Commission date 10/4/2011
Construction cost $5,000,000
Owner(s) Republic Services, Inc.
Solar field
Type Ground Mount, Flexible PV
Site area 48 acres
Power generation
Units operational 7,008 UNI-SOLAR PVL-144 photovoltaic panels
Nameplate capacity 1,009 KW
Annual net output 1.3 GWh

The Hickory Ridge Landfill is a

municipal solid waste

landfill located in

Conley, Georgia

, United States and privately owned by

Republic Services

. The site was opened in 1993 and closed in 2006; it contains nearly 9,000,000 cubic yards of waste.

Photo taken on 8/25/2010 prior to construction
Hickory Ridge Landfill taken from airplane during landing into Atlanta's Hartsfield-Jackson Airport on 6/21/2011 - during construction
Photo of Hickory Ridge Landfill taken on 6/21/2011 while driving north on I-675

The Hickory Ridge Landfill was capped in October 2011 with a dual-purpose landfill closure system referred to[by whom?] as an Exposed Geomembrane Solar Cover (EGSC).[citation needed] Developed by Carlisle Energy Services, the closure system provides renewable electricity via (photovoltaic) solar panels,

The project is the second installation of an EGSC and is the world's largest installed system of its kind. At the time of commissioning it was the largest solar photovoltaic system in the state of Georgia.[1] It also represents a $5,000,000 investment by Republic Services supported by a $2,000,000 grant from the Georgia Environmental Finance Authority (GEFA).[2]

System Details[edit]

The landfill closure system features a green, 60-mil scrim reinforced TPO (thermoplastic polyolefin) geomembrane cover 48 acres in total. A one-megawatt photovoltaic solar panel array is located on the southwest and southeast slopes of the landfill in an area approximately ten acres.[3]

The one-megawatt solar array features over 7,000 flexible solar laminates, composed of 36 laminates bonded one at a time to 12' wide by 120' long panels. Each photovoltaic roll was rated at 5,184 Wp DC.[citation needed]

The closure system meets infiltration and erosion criteria as prescribed by the United States Environmental Protection Agency, while also capturing the methane gas that is generated by the landfill, turning it into energy in a separate operation. The Georgia Environmental Protection Division approved the landfill closure system as a "Final" closure system.[4]

The photovoltaic system is actually composed of four separate arrays located on the 3H:1V slopes on the southeast and southwest areas of the landfill. Each photovoltaic array is rated for approximately 250kWp DC each; each with a 260kWp DC inverter.

The photovoltaic array is expected to generate 1,300,000 kWh in its first year of production.[5]

Real-time energy production can be viewed via the online remote monitoring system.

Key Project Partners[edit]

The following companies helped to develop, engineer and construct the system:[6]


HDR Inc. received the following awards for their engineering work on this project:[7]

American Environmental Group (AEG) received the 2013 Award of Excellence from the International Association of Geosynthetic Installers (IAGI) for their work as the geomembrane installer for the project



  1. ^ "Georgia's Largest Solar Project Is a Landfill-Covering System". Electrical Contractor. Retrieved 5/1/2011.  Check date values in: |accessdate= (help)
  2. ^ "From Landfill To Solar Energy Farm". 10/5/2011. EastAtlantaPatch. 
  3. ^ "Solar Powered Landfills". Energy Now News. Retrieved 2011-10-31. 
  4. ^ "Hickory Ridge Landfill Solar Energy Cover". HDR Inc. 
  5. ^ "Republic Services Caps Atlanta Landfill with Flexible Solar Cover". PR Newswire. Retrieved 10/4/2011.  Check date values in: |accessdate= (help)
  6. ^ "Case Study: Republic Hickory Ridge Landfill". Carlisle Energy Services, Inc. Retrieved 11/1/2012.  Check date values in: |accessdate= (help)
  7. ^ "Hickory Ridge Landfill Solar Energy Cover". HDR Inc. Retrieved 2012.  Check date values in: |accessdate= (help)
  8. ^ "Coca-Cola Cogen Plant". Mas Energy. Retrieved 5 August 2012. 
  9. ^ Signet, Anna. "Landfill gas ranks Coca-Cola third in EPA green power users". Biomass Magazine. Retrieved 8/9/2012.  Check date values in: |accessdate= (help)