HomeMy WebLinkAboutEA 15-08; Maerkle Reservoir Solar Project; Administrative Permits (ADMIN) (2)Early Assessment For City Projects-Revised 1/3/11 Page 4 of4
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City of Carlsbad RES-BCT Feasibility Study
Contents
I. Executive Summary .................................................................................................................... 3
A. Background ............................................................................................................................ 3
B. Findings .................................................................................................................................. 3
II. Analysis and Approach .................. : ............................................................................................. 5
A. RES-BCT Analysis and Assumptions ......................................................................................... 5
B. NEM Analysis and Assumptions .............................................................................................. 6
Ill. Detailed Results ..................................................................................................................... 6
A. Site Specific Analysis .............................................................................................................. 6
Reservoir ................................................................................................................................... 8
Dove Library .............................................................................................................................. 9
Police Station ........................................................................................................................... ~o
Faraday Building ....................................................................................................................... n
Water Recycling Facility ............................................................................................................ 12
Golf Course .............................................................................................................................. ~3
Library Learning Center ............................................................................................................ ~4
B. Other Potential Accounts ...................................................................................................... ~5
Appendix A: SDG&E Electric Commodity Rate Schedules .................................................................. ~8
Appendix B: RES-BCTTariff .............................................................................................................. 29
Appendix C: RES-BCT Allocation Request Form ................................................................................. 35
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City of Carlsbad RES-BCT Feasibility Study
I. Executive Summary
A. Background
The City of Carlsbad (City) is interested in investigating a solar installation on a large parcel of land near
one of their reservoirs. The City desired the benefits of this solar installation to have a direct savings
impact beyond the utility account to which it was interconnected. Therefore, the City looked to have
an unbiased third party energy consulting firm objectively analyze the feasibility of installing a central
solar system which could benefit multiple City electric utility accounts. Currently, one such mechanism
is available to San Diego Gas and Electric (SGD&E) customers wishing to pursue these types of
opportunities, the Renewable Energy Self-Generation Bill Credit Transfer (RES-BCT) program. CSE was
retained by the City to perform a feasibility assessment of a solar photovoltaic (PV) system to produce
electric utility cost savings across multiple City accounts. CSE would also determine the optimal
configuration of accounts and credit allocations.
CSE is pleased to present the following results of our evaluation. Our findings are based on currently
applicable tariffs, utility data collected directly from SDG&E, and input from the City. Unless otherwise
explicitly stated, all capacities identified (kW) should be assumed to be alternating current (A C).
B. Findings
When we evaluated the feasibility of the City using the RES-BCT tariff to provide solar to their
accounts, we analyzed whether the mechanism itself was viable, and if so, was it more or less viable
than utilizing the standard Net Energy Metering (NEM) tariff. CSE's analysis determined that a single
RES-BCT solar installation is more feasible than multiple NEM systems. However, the City will have to
determine whether the payback identified for a RES-BCT installation meets their economic criteria.
CSE identified seven City accounts as potential participants in the RES-BCT program, one generating
account and six benefitting accounts. These seven accounts represented about so% of the applicable
commodity costs ofthe 38 time-of-use (TOU) accounts currently billed to the City, which is why they
were selected for detailed rate analysis. To form an appropriate comparison, these same accounts
were evaluated for solar under the standard NEM tariff. Individual site results are described in section
Ill. Our analysis included estimates for tariff fees, interconnection fees, and applicable incentives.
Installation costs were provided by the City and were $4/W-AC for the NEM scenario and $3/W-AC for
the RES-BCT scenario. Any potential costs associated with distribution upgrades was not included and
should be verified with SDG&E. It should be noted that for RES-BCT systems the California Solar
Initiative (CSI) incentive is only available for a portion of the energy attributed to the generating
account. Because the City expressed a desire to own and operate the systems themselves, rather than
through a third party ownership structure, all results are shown as simple paybacks. The following table
is a summary of our findings.
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City of Carlsbad RES-BCT Feasibility Study
1 Page 7
Reservoir
City of Carlsbad RES-BCT Feasibility Study
While the reservoir has ample space to host PV
arrays adjacent to the point of service, the annual
consumption on the meter has limited the
potential NEM capacity to only 97 kW. The meter
is currently on the PA-T-~ tariff, a pumping and
agricultural tariff. The most advantageous tariff
with NEM solar is the DG-R tariff. This tariff is
only available to customers with eligible
renewable generation. Under the RES-BCT
arrangement, this meter would switch to the DG-R tariff as it has the most lucrative commodity rates
by which to generate credits.
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Commented [JDR4]: Maerkle??
Dove Library
would remain on the CPP tariff as well after solar.
City of Carlsbad RES-BCT Feasibility Study
The Dove library's annual consumption is large
enough to utilize up to about 527 kW of solar.
However, due to the limited space available to host
PV arrays, the potential NEM capacity is only about
385 kW. The meter is currently on the standard
medium/large commercial tariff, AL-TOU, with a
demand response commodity tariff component,
Critical Peak Pricing (CPP). The most
advantageous tariff with NEM solar would be the
DG-R tariff. Our analysis assumed this account
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Police Station
City of Carlsbad RES-BCT Feasibility Study
The Police Station's annual consumption is large
enough to utilize up to about 473 kW of solar.
However, due to the limited space available to
host PV arrays, the potential NEM capacity is only
about :175 kW. The meter is currently on the
standard medium/large commercial tariff, AL-
TOU. The most advantageous tariff with this
potential capacity of solar would be the existing
AL-TOU tariff.
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City of Carlsbad RES-BCT Feasibility Study
The Faraday Building's annual consumption is
large enough to utilize up to about 475 kW of
solar. However, due to the limited space available
to host PV arrays, the potential NEM capacity is
drastically limited to only about Bo kW. There is a
field to the South of the facility which may be a
potential site to host a larger array. The City will
have to determine whether this area is a viable
option or not. The meter is currently on the
standard medium/large commercial tariff, AL-
TOU, with a demand response commodity tariff component, Critical Peak Pricing (CPP). The most
advantageous tariff with NEM solar is the DG-R tariff. Our analysis assumed this account would remain
on the CPP tariff as well after solar.
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Water Recycling Facility
City of Carlsbad RES-BCT Feasibility Study
The Water Recycling Facility's annual consumption
is large enough to utilize up to about 380 kW of
solar. However, due to the limited space available
to host PV arrays, the potential NEM capacity is
limited to only about 350 kW. There is a field to the
South ofthe facility which may be a potential site
to host a larger array. The City will have to verify
whether this area is a viable option or not. The
meter is currently on a pumping and agricultural
tariff, PA-T-1, with a demand response commodity
tariff component, Critical Peak Pricing (CPP). The most advantageous tariff with this potential capacity
of NEM solar would be the DG-R tariff. Our analysis assumed this account would remain on the CPP
tariff as well with the DG-R tariff.
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Golf Course
City of Carlsbad RES-BCT Feasibility Study
The Golf Course's annual consumption is large
enough to utilize up to about 280 kW of solar.
However, due to the limited space available to
host PV arrays, the potential NEM capacity is only
about :1.75 kW. There are some areas surrounding
the clubhouse which may be potential locations to
host more arrays, but the City will need to verify
whether these are viable options or not. The
meter is currently on the standard medium/large
commercial tariff, AL-TOU. Because of the
differences in electric rates between the existing tariff and the DG-R tariff, at this system size, the most
advantageous tariff with NEM solar would be to remain on the AL-TOU tariff.
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Library Learning Center
City of Carlsbad RES-BCT Feasibility Study
The Library Learning Center's annual consumption
is large enough to utilize up to about ~96 kW of
solar. However, due to the limited space available
to host PV arrays, the potential NEM capacity is
limited to only about 82 kW. The meter is currently
on the standard medium/large commercial tariff,
AL-TOU. The most advantageous tariff with this
potential capacity of NEM solar would be the DG-R
tariff.
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City of Carlsbad RES-BCT Feasibility Study
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City of Carlsbad RES-BCT Feasibility Study
Page 17
City of Carlsbad RES-BCT Feasibility Study
Appendix A: SDG&E Electric Commodity Rate Schedules
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City of Carlsbad RES-BCT Feasibility Study
Appendix B: RES-BCT Tariff
Page 29
City of Carlsbad RES-BCT Feasibility Study
Appendix C: RES-BCT Allocation Request Form
Page 35
The available land located at the Maerkle facility is ideal for installation of a variety of
photovoltaic technologies. Its proximity to grid loads, swaths of available land and minimal
shade impacts create a fantastic environment for solar generation equipment. It is for these
reasons we analyzed the site comparing the technologies described above.
Table 5: Technology Legend
Legend
Tilted, rack mounted high efficiency crystalline RM-HC
Tilted, rack mounted thin-film RM-TF
Tracker, single axis rack mounted high efficiency crystalline SATR-HC
Tracker, dual axis rack mounted high efficiency crystalline DATR-HC
Tracker, pole mounted concentrating crystalline photovoltaics CPV
Table 6: Ground Mounted Technology Comparison
Metric RM-HC RM-TF SATR-HC DATR-HC CPV
Maximum System Sizing (MW) 11 4.5 5 2.6 2.6
Estimated Installation Cost $74,250,000 $20,250,000 $42,187,500 $22,815,000 $26,000,000
Energy Produced (kWh)
Year1 16,745,357 6,992,153 9,477,561 5,407,802 9,260,320
Year25 14,652,187 6,118,134 8,292,866 4,731,827 8,102,780
Capacity Factor 17.4% 17.7% 21.6% 23.7% 40.7%
GHG Reduction (TONS C02/YEAR)*** 10,047.2 4,195.3 5,686.5 3,244.7 5,556.2
Annual Payments from Utility at MPR
Year1 $2,381,679 $994,580 $1,351,397 $767,902 $1,314,955
Year25 $2,083,969 $870,257 $1,182,472 $671,914 $1,150,586
1 Year ROI* 3.208% 4.912% 3.203% 3.366% 5.058%
Simple ROI** 6.546% 10.023% 6.537% 6.869% 10.321%
Simple Payback (Years)** 15.3 10.0 15.3 14.6 9.7
Annual Payments from Utility at MPRx2
Year1 $4,763,357 $1,989,160 $2,702,794 $1,535,803 $2,629,910
Year25 $4,167,938 $1,740,515 $2,364,945 $1,343,828 $2,301,171
1 Year ROI* 6.415% 9.823% 6.407% 6.732% 10.115%
Simple ROI** 13.092% 20.047% 13.075% 13.738% 20.643%
Simple Payback (Years)** 7.6 5.0 7.6 7.3 4.8
California Center for Sustainable Energy
8690 Balboa Avenue, Suite 100 San Diego, 92123 · 858.244.7294
-14-
Mr./Ms. Last name
Feb. 27, 2010
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hour 85th percentile storm event but also reducing post development flows to within
10% of the predevelopment runoff amounts (hydromodification), all of which would be
analyzed in the SWQMP.
As requested, I have attached a list of engineers that have worked on past storm water
quality projects in the city for your reference.
2. Provide a preliminary grading plan prepared by a registered civil engineer with your
application submittal for any discretionary permits. Show existing and proposed
topographic contours. Show any proposed grading and list gra~ing quantities. Identify
downstream drainage infrastructure. Show proposed storm water quality BMP's on the
grading plan.
3. Submit a preliminary title report with your application submittal for any discretionary
permits and plot any easements identified in the report.
If you or the applicant has any questions, please either see or contact me at 602-2781.
~~\)
DAVID RICK
Associate Engineer
Land Development Engineering
Attachment: Engineer of Work and Developer Contact Information.
California Regional Water Quality Control Board for the San Diego Region letter dated May
29, 2015.
Mr./Ms. Last name
Feb.27,2010
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