Clean Development Mechanism Projects

Project Title

Mianyang Landfill Gas Utilisation Project 2

Country

China

Project description

The project activities will install landfill gas extraction equipment and utilize the recovered gas to generate electricity at Mianyang landfill in Sichuan Province, China.

The project activity will use combination of both vertical and horizontal piping systems for the landfill gas extraction. The extracted gas will be used to generate electricity. When the yield of gas is insufficient to power a new generator, an enclosed flare will be employed to minimise methane emissions. The applied methodologies are ACM0001 / Version 06 "Consolidated baseline methodology for landfill gas project activities" and AMS I D / Version 12 "Grid connected renewable electricity generation".

The project is a normal scale CDM project activity.

Crediting period is 10 years fixed and expected to start from 01/01/2008.

Estimated annual average emission reduction is 103,204t-CO2.

Project design document (PDD)

Period for comments was from 10th November to 9th December 2007.
The following comments were received:
Name: Stefan Winter
Email:wist.ecc@gmail.com
Date: 28 November 2007

Comments:

Dear Sir or Madame, I checked Your basically well prepared PDD. But there is one point I hope You could claryfy for me. Taking into mind table 4: basic data for IRR calculation, it is mentioned an installed capacity of 2MW and annual electricity supply of 11,232MWh. If I compare to table 9, page 27, the quantity of power generated by the project it is mentioned a power generation in MWh/year from 17,236 over 18,802 till 2013 before it is slightly decreasing. For me this does not fit. Why didn't You consider the latter numbers in Your financial calculation? The IRR therefore would be higher. And anyway how can You generate 18,802 MWh/year by an installed capacity of 2MW? This would lead to 9,401 hours of operation per year which is impossible. If I go to table 8, page 26, the quantity of methane destroyed in the course of power generation, and calculate the assumed operation hours from MDelec,y and actually consumed by generator I end up at 8760h/y. This would mean 24h, 365days! Thats impossible! How about maintenance, service, change of oil, ...? How could it be that for the financial calculation only 5616h of operation can be the base and for the CER calculation 8760h/y? Shouldn't this be reasonable numbers? Because You can NEVER reach 8760 h of operation in a year! Thanks in advance for Your reply. Stefan Winter

Dear Sir or Madame, one more topic I have to add to my comment previous sent today. Usually the contract with chinese generator suppliers show a warranty of 12 month or 7,000 h of operation. Shouldn't the financial calculation be based on this operation hours at least for the first year of operation? The PDD shows only 5,616Oh/y, which is in my eyes anyway too low. Even chinese engines reach at least 6,000Oh/y. And what exaclty is the technology transfer? I only could see some knowledge transfer e.g. for gas collection but as the main technical part, the engines are domestic products where is the real technology transfer? It is mentioned that vertical pipelines inside the landfill for collection will/are installed. This usually leads to increased water in the collection system as not only gas is infiltrating in the HDPE pipes water as well. So beside the condesation water there will be much more leachate inside the collection system. How is it planned to treat this water? Could You explain how horizontal pipes increase the collected amount of landfill gas? Usulaly You can only collect as much as there is in the landfill body. If You know how to do it vertical wells are enough? This kind of system I think is also not easy to operate as wells connected to negative pressure could influence each other. Who will operate the plant for sustainable development of the project? with kindest regards Stefan Winter