City of dallas water utilities department

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  • City of Columbus - Human Resources Department
  • PDF City of Dallas North Central Texas October 1, 2011
  • CITY OF DEARBORN RESIDENTIAL SERVICES DEPARTMENT …

CITY OF DEARBORN RESIDENTIAL SERVICES DEPARTMENT …

City of Dallas - Water Utilities Department
Green Energy Recovery
Southside Wastewater Treatment Plant
Presented to the TEC
February 8, 2010
Green Energy Recovery
Southside Wastewater Treatment Plant
The objective of this briefing is to provide an
update on the progress of the existing
Southside Wastewater Treatment Plant
Renewable Energy Project and provide details
on additional opportunities associated with
the Co-Digestion project
2
1
Briefing Outline
What is Biogas
Southside Wastewater Treatment Process
Project Background and Drivers
Renewable Energy Leasing Project Details
Benefits Associated with the Project
Cogeneration Facility - Utilities Update
Cogeneration Facility - Lease Agreement Update
Additional Opportunities - Co-Digestion Project
Questions
3
What is Biogas?
Biogas is the methane (CH4) produced as a by-
product of the anaerobic digestion process at
the Southside Wastewater Treatment Plant
DWU's biogas is currently used to fire boilers to
heat the digesters, but a large portion is burned
off in flares
Biogas is a renewable fuel source that can be
used to generate electricity in lieu of using coal
or natural gas
4
2
Southside Wastewater Treatment Process
Screenings Grit Primary Secondary
Removal Removal Clarification Aeration Clarification Filtration
RRaaww M M
SSeewwaaggee
Treated
Effluent
Wastewater Receiving
Treatment Stream
Screenings Grit Primary Process Secondary
Sludge Sludge
CH4 (Biogas)
Gas Proposed Facilities
Flare
IInn lliieeuu ooff ccuurrrreenntt ooppeerraattiioonnss
Biogas Gas Heat and where aa mmaajjoorriittyy ooff tthhee
Storage Power bbiiooggaass iiss ffllaarreedd,, tthhee bbiiooggaass
Generation ccaann bbee sseenntt ttoo tthhee
to SWWTP ggeenneerraattiioonn ffaacciilliittyy ffoorr tthhee
Gas Hot Water pprroodduuccttiioonn ooff eelleeccttrriicciittyy aanndd
Digesters Compression Supply and hhoott wwaatteerr..
Return Lines 5
Project Background and Drivers
Wastewater Residuals Master Plan (1994)
- Recommended consolidation of solids processing and
disposal at Southside Wastewater Treatment Plant
(SWWTP) and the construction of a Cogeneration
Facility to convert the biogas being produced into
electricity
Texas Senate Bill 7 (1999)
- Set goals for electricity generation from renewable
energy resources and established rules for buying and
selling renewable energy credits (REC's)
Texas Senate Bill 5 (2001)
- Required political subdivisions to reduce energy
consumption by 5% each year for five years. Program
was renewed for another 5 years in 2007 with the
passage of Senate Bill 12
6
3
Project Background
Two separate projects previously awarded in support
of the Cogeneration Facility
November 10, 2008, Council awarded a twenty-year
lease agreement to Ameresco Dallas, Inc. to finance,
design, permit, build, operate and maintain a
Cogeneration Facility at SWWTP (Contract No. 08-150)
February 11, 2009, Council awarded the construction of
the Cogeneration Facility utilities and digester
improvements at SWWTP (Contract No. 07-234)
Briefed to the Transportation and Environment
Committee on September 8, 2008
7
Renewable Energy Leasing Project Details
DWU RESPONSIBILITY LESSEE/DEVELOPER RESPONSIBILITY
Southside WH Meter
WWTP Main
Substation To/From Natural
To WWTP
Oncor Gas
Loads WH
Meter
DWU RESPONSIBILITIES O
From
ncor
? Produce Guaranteed Quantity Gas Gas
and Quality of Biogas Compression Storage
? Provide Utility Connections
(Contract 07-234) WH Meter
? Broker REC's Meter
Meter L/D RESPONSIBILITIES
? Design/Build/Finance/Operate
and Maintain Cogeneration
Facility (Contract 08-150)
Southside ? Generate/Deliver Electricity
Digesters Steam ? Generate/Deliver Hot Water
Meter Condensate ? Permit Facility
Pumping
Guaranteed
8
4
Benefits of the Project
Proposed facility will produce 30,000,000 kWh per year
reducing Southside's purchased power by 60%
Since the cost of electricity to be provided by the
Lessee/Developer will be substantially less than cost
from Oncor/Brazos, the resulting savings to be
realized is estimated at $1.6M dollars per year over the
twenty year term of the lease
This project will generate approximately 30,000
Renewable Energy Credits (REC's) per year. At the
current market value of $2.00 ($7.50)/REC, the
monetary value to the City will be $60,000
($225,000)/year
The REC's generated by this project may also be used
for other purposes such as points contributing
towards LEED's certification. 9
Benefits of the Project (cont'd)
This project will help the City comply with Texas
Senate Bills 5 and 12
This project will provide a fourth source of electricity
to SWWTP which will increase the service reliability at
the plant
Other than the cost to extend utilities to the leased
premises, this project will not require any capital
outlay to implement
This project will not require any additional labor or
skill set above and beyond DWU's current staff
complement and capabilities
New cogeneration system increases emissions at the
SWWTP but reduces overall emissions in the region
10
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