AMERICAN SAMOA POWER AUTHORITY. Materials Management Office REQUEST FOR PROPOSALS (RFP) Renewable Energy Integration Study for the ASPA Power Grid

Transcription

1 AMERICAN SAMOA POWER AUTHORITY Materials Management Office REQUEST FOR PROPOSALS (RFP) Renewable Energy Integration Study for the ASPA Power Grid RFP NO. FY ESD.RENEWABLE ENERGY June 17, 2013 UTU ABE MALAE EXECUTIVE DIRECTOR

2 Table of Contents Title Page... 1 Table of Contents... 2 Notice to OFFERORS... 3 Proposal Invitation... 4 Special Reminder to Prospective OFFERORS... 5 Significant Dates... 6 General Terms and Conditions... 7 Proposal Transmittal Form (Attachment A) Scope of Work (Attachment B) Proposal Cost Form (Attachment C) Offeror Qualification Form (Attachment D) Non-Collusion Form (Attachment E) Disclosure Statements Form (Attachment F) A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 2

3 NOTICE TO OFFERORS REQUEST FOR PROPOSALS Issuance Date: June 17, 2013 RFP No. FY ESD.RENEWABLE ENERGY PROJECT: RENEWABLE ENERGY INTEGRATION STUDY for the ASPA POWER GRID CLOSING DATE/TIME July 25, 2:00 p.m. American Samoa Time The American Samoa Power Authority (ASPA) requests proposals from qualified offerors for the Renewable Energy Integration Study for the ASPA Power Grid. A complete RFP package may be picked up from the ASPA Materials Management Office located at the Tafuna Power Plant compound (Security Guard at the Gate will direct you to the Materials Management Office). You may also view this RFP online at which is the ASPA Website. For more information about this RFP, please contact the following person(s): Ms. Nancy Tinitali-Mauga Procurement Supervisor Tel Mr. Joachim Fong Engineering Services Manager Tel Qualified Offerors must submit proposals in a sealed envelope, box, or other enclosure addressed to the ASPA Materials Management. The sealed envelope or box must be labeled RFP No. FY ESD. RENEWABLE ENERGY, Attention: Nancy Tinitali-Mauga and show date and time of proposal opening. An original, one PDF, electronic copy, and five (5) hard copies of the proposal must be received in the Materials Management Office located in the Tafuna Power Plant Compound no later than 2:00 pm on July 25, Late submittals will not be opened or considered and will be designated as non-responsive. All proposals shall be accompanied by a proposal bond equal to 10 percent (10%) of the total proposal to be forfeited to ASPA in the event of failure of the Offeror to honor the terms of its proposal. The American Samoa Power Authority reserves the right to: 1. Reject all proposals and reissue a new or amended RFP or addenda as deemed necessary by ASPA; 2. Request additional information from any Offeror; 3. Select a firm for award based on other than least cost (e.g. capability to complete work in a timely fashion or proven technical capabilities); 4. Negotiate a contract with the Offeror that is selected for award; and/or 5. Waive any non-material violations of rules set up in this RFP at its sole discretion. Utu Abe Malae, Executive Director Date A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 3

4 PROPOSAL INVITATION AMERICAN SAMOA POWER AUTHORITY MATERIALS MANAGEMENT OFFICE P.O. BOX PPB PAGO PAGO, AMERICAN SAMOA ISSUANCE DATE: June 17, 2013 REQUEST FOR PROPOSALS: FY ESD.RENEWABLE ENERGY RENEWABLE ENERGY INTEGRATION STUDY for the ASPA POWER GRID INSTRUCTIONS: 1. This Request for Proposals (RFP) shall require an original, one PDF electronic copy, and five (5) hard copies that must be received at ASPA s Materials Management Office no later than 2:00 pm on July 25, The envelope or box must be labeled RFP No. FY ESD.RENEWABLE ENERGY. Late submittals will not be opened or considered and will be determined as non-responsive. All Offerors shall provide sufficient written and verifiable information that responds to the requirements set forth herein and in the Scope of Work (SOW). 2. Pre-proposal Questions Any pre-proposal questions and/or clarifications shall be submitted to Nancy Tinitali-Mauga in writing (through electronic mail or hard copy at maugan@aspower.com ). Questions and/or clarifications are welcome and should be submitted no later than 4:00 pm on June 28, ASPA shall issue addenda to address any questions and/or clarifications as necessary. NOTE TO OFFERORS: This Request for Proposals (RFP) is subject to the attached General Terms and Conditions of the RFP for RENEWABLE ENERGY INTEGRATION STUDY for the ASPA POWER GRID. The undersigned Offeror agrees to furnish, within the time specified, the articles and services at the price stated opposite the respective terms listed on the schedule provided, unless otherwise specified by an Offeror. In consideration of the expense to ASPA in opening, tabulating, and evaluating this proposal, and because time is of the essence, the undersigned agrees that this proposal shall remain firm and irrevocable within one hundred and twenty (120) calendar days from the date opening to supply any or all of the items which prices are proposed. SIGNED: DATE: A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 4

5 AMERICAN SAMOA POWER AUTHORITY SPECIAL REMINDERS TO PROSPECTIVE OFFERORS Where applicable, Offerors are reminded to read the Proposal Solicitation Instructions and General Terms and Conditions attached to the Proposal Invitation to ascertain that all of the following (see boxes checked) requirements of the proposal re submitted in the proposal envelope at the date and time for proposal opening. [x] 1. PROPOSAL FORMS a. Proposal Invitation Form (Page 3) b. Proposal Transmittal Form (Attachment A) [x] 2. TECHNICAL PROPOSAL The Technical Proposal shall follow the Scope of Work refer to page. Also, complete Offeror Qualification Sheet. (Attachment B) [x] 3. CONTRACT COST PROPOSAL The Offeror shall submit a contract price as stated in page. [ ] 4. PROPOSAL BOND The Offeror shall submit a proposal bond for 10% of the total proposal amount and execute the attached proposal bond form. (Attachment C). This reminder must be signed and returned with the technical proposal envelope. Failure to comply with requirements may result in disqualification and rejection of the proposal. I, authorized representative of l acknowledge receipt of this special reminder to prospective Offerors together with Proposal Invitation RFP No. FY ESD.RENEWABLE ENERGY as of this date, OFFEROR S Representative Signature Addenda A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 5

6 SIGNIFICANT DATES The following are significant anticipated Scheduling and Contract Dates for this RFP: June 17, 2013 June 28, 2013 before 4:00 pm July 1st, 2013 July 25, 2:00 pm local time August 1st, 2013 August 15, 2013 September 1, 2013 RFP Issuance Date Deadline for submitting questions, inquiries, and/or clarifications to. ASPA Deadline to Issue any Addenda to address questions and or clarifications as necessary. Closing Date. See details of how to send proposals on the Proposal Invitation Form page 4 of this RFP. Inform Successful Offeror/proposal Contract Award Contract Execution and Notice to Proceed A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 6

7 GENERAL TERMS AND CONDITIONS FY ESD.RENEWABLE ENERGY 1. INTRODUCTION A. This is a Request for Proposals (RFP) issued by the American Samoa Power Authority ( ASPA ) in American Samoa. ASPA is soliciting proposals for Renewable Energy Integration Study for the ASPA Power Grid. B. The Offeror shall propose a plan for Renewable Energy Integration Study for the ASPA Power Grid. The American Samoa Power Authority (ASPA), in order to comply with the American Samoa Code Annotated ( ASCA ) Section and other regulatory requirements, hereby issues this Request for Proposals (RFP). Through this RFP, the American Samoa Power Authority seeks proposals from qualified firms with electric utility and renewable energy experience to conduct a renewable energy integration study for the ASPA Power Grid. The complete description of required services and deliverables is listed in the Scope of Work (SOW). There is no expressed or implied obligation for ASPA to reimburse Offerors for any expenses incurred in preparing proposals in response to this RFP. The specific details shown herein shall be considered minimum unless otherwise shown. By submitting a proposal, the Offeror consents to personal jurisdiction and venue in the High Court of American Samoa, Trial Division. 2. ASPA Background American Samoa, a group of five volcanic islands located in the South Pacific Ocean, experience high dependency on imported diesel fuel and other fossil fuel products for power generation. These relatively small isolated power systems with no interconnections have high electricity tariffs. Some of the older technology-based petroleum-fueled generation facilities have relatively poor heat rates. The N-2 reliability criterion (typical for small isolated power systems) requires availability of higher spinning reserve margins leading to excessive operational costs. Increasing concerns about environmental impacts, growth in electricity demand, and oil price volatility create urgent needs for providing a path toward less oil-dependent, lower cost, and a lower environmental impact, sustainable energy future for the American Samoa. A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 7

8 The American Samoa Power Authority (ASPA) is the only utility operating in American Samoa. It is an entity of the government and serves about 12,400 customers in two districts. ASPA s electrical distribution system on Tutuila operates at a nominal 13.2 kilovolts (kv). ASPA services two substations, approximately 170 miles of 13.2-kV lines, and 2,000 miles of low-voltage lines. There are a few underground feeders on the island, but most are overhead due to financial constraints. Because of the relatively small size of the island, there is no transmission system per se, but there is a single 34.5-kV tie line between the Tafuna and Satala power plants (Figure 1). The tie line is 9.5 miles long with 4/0 gauge copper underground cable in duct. The Tafuna plant is located on the western side of the island mainly manages airport and residential loads. The Satala plant is located among the more industrial (tuna canneries) and commercial (government building) loads along Pago Pago Harbor. Figure 1: Map of ASPA feeders A summary of basic power system information for the island of Tutuila of American Samoa can be seen in Table 1. Detailed information related to each generator can be found in the Appendix A. Table 1: Tutuila power system information Installed capacity (diesel power) MW Peak load 23.1 MW Base load 16 MW 2015 peak load forecast 24.5 MW Current customers (2010 data) 12,400 Projected annual load growth 1-2% A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 8

9 The incorporation of renewable energy technologies, initially at lower levels, but increasing in overall contribution over time, is a critical part of reducing the amount of fuel imported for power generation in American Samoa. There are many renewable energy opportunities for American Samoa, although more detailed project and resource assessments are needed to confirm the viability of specific options for development. The focus of this study will be on wind and photovoltaic (PV) solar technologies. Wind and solar energy has the potential to play a significant role in supplying electrical energy to American Samoa. Combining the available wind and solar resource, with a high level of existing infrastructure, and high energy costs; make wind and PV technologies an attractive potential addition to the current generation portfolio. 1. DATE/TIME/PLACE OF PROPOSAL SUBMISSION AND PROPOSAL OPENING Each Offeror must submit its proposal in a sealed envelope addressed to the ASPA Materials Manager. An original, one (1) PDF electronic copy, and five (5) hard copies of the proposal must be received in the Materials Management Office no later than 2:00 pm local time on or before July 25 th, Late submittals will not be opened or considered and will be determined as nonresponsive. All Offerors shall provide sufficient written and verifiable information that responds to the requirements of the RFP, and in accordance with the Scope of Work. 2. PRE-PROPOSAL QUESTIONS: Any pre-proposal questions and/or clarifications shall be submitted to Nancy Tinitali- Mauga OR Nancy Tinitali-Mauga through electronic mail maugan@aspower.com or in writing no later than 4:00 p.m. local time on June 28th, ASPA shall issue addenda to address any questions and/or clarifications as necessary. A pre-proposal teleconference shall be held on or before June 24th, A dial-in number for the teleconference shall be provided upon request. Offerors are encouraged to participate in the teleconference and ask questions and obtain clarifications. 3. ADDENDA: ASPA reserves the right to issue an addenda for any changes to this RFP. Offerors shall send ASPA a signed form confirming receipt of each addendum. 4. PROPOSAL PREPARATION INSTRUCTIONS: The proposal must contain three (3) parts. Offerors shall prepare their proposals in detail accordingly. a. Technical. Offeror must describe its approach in addressing duties outlined in the SOW. This includes delineation of specific actions the Offeror will undertake to achieve the goals and objectives outline in the Scope of Work A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 9

10 b. Prior Related Experience/Past Performance. A description of the firm s related experience, background, past performance and credentials as stated on the attached Offeror Qualification Sheet, which is incorporated herein as if fully set forth. This part includes a dossier of personnel qualifications. Offeror should provide references (2 or more) and a project hisotry that verify a minumum of three (3) years of specific or related experience. Offeror must hold appropriate and current businesslicense for these services. c. Contract Price: Offeror s price for services and materials, including a breadown of project costs (e.g. estimated for materials, cost for labor, etc.). An increase of contract or additional costs in any time during the contract should not exceed 4% of original contract price. 5. ATTACHMENTS Attachment A: Proposal Transmittal form Attachment B: Offeror s Qualification Sheet Attachment C: Proposal Bond Form 6. TYPE OF CONTRACT The successful Offeror, as an independent contractor and not as an agent or employee of the American Samoa Power Authority, shall furnish the necessary personnel, materials, insurances, licenses, equipment, ground transportation to and from work areas, required materials or services, and otherwise do all things necessary to perform the work and services specified in the Scope of Work. 7. BASIS FOR SELECTION: Proposals will be evaluated by a Source Evaluation Board (SEB). SEB members shall be chosen by the Materials Manager based on recommendations from the ESD Manager. Submission of a proposal shall constitute a waiver of any challenge or dispute of SEB members, as well as the choice of methodology set forth on the SEB score sheets. The award will be made by ASPA in accordance with the evaluation criteria set forth herein and in accordance with the ASPA s Procurement Code. A determination shall be made by the SEB of those responsible Offerors whose proposals have the potential of being selected for award. The determination shall be included in the contract file. Discussions may be conducted by the SEB with those responsible Offerors whose proposals are determined to have a reasonable chance of being selected for award. A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 10

11 These discussions shall only be conducted for obtaining clarification from the Offeror on its proposal to ensure full understanding of and responsiveness to the RFP requirements. Discussions shall be conducted individually with each Offeror and care shall be exercised to ensure that no information derived from competing Offeror s proposals is disclosed. All Offerors with whom discussions are conducted shall be accorded an opportunity to revise their proposals in response to specific clarifications based on the discussions. Unless the Materials Manager determines that satisfactory evidence exists that a mistake has been made, as set forth in the Procurement Code Section Offerors will not be permitted to revise their proposals after proposal opening. ASPA reserves the right to award a contract to the Offeror that submits the proposal which meets the requirements set forth herein and brings in the best value to ASPA and/or in the best interest of the American Samoa Power Authority after taking into consideration the aforementioned factors. ASPA reserves the right to select portions of a proposal or to reject any and all proposals. 8. EVALUATION CRITERIA: Offeror s proposals will be evaluated and ranked by the Source Evaluation Board utillizing the following point system: Experience 0-35% Technical Concept and Content 0-45% Contract Price 0-20% 9. QUALIFICATION OF OFFEROR: The American Samoa Power Authority (ASPA) may make such investigations as it deems necessary to determine the Offeror s legal ability to enter into the agreement, and the Offeror shall furnish to ASPA such information and data for this purpose as ASPA may request, or the Offeror may be deemed non-responsive. 10. MULTIPLE PROPOSALS COLLUSION: If more than one proposal is offered by any one party or in the name of its clerk, partner or other person; all proposals submitted by said party may be rejected by ASPA. This shall not prevent an Offeror from submitting alternate proposals when called for. A party who has proposed prices on materials is not thereby disqualified from quoting prices to other Offerors or from submitting a proposal directly to ASPA. If ASPA believes that collusion exists among any Offerors, none of the participants in such collusion shall be considered. A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 11

12 Proposals in which the contract prices are unbalanced or unrealistic may be rejected at ASPA s sole discretion. 11. OFFEROR s UNDERSTANDING: Each Offeror must understand and acknowledge the conditions relating to the execution of the work and it is assumed that it will make itself thoroughly familiar with all of the Contract Documents prior to execution of the written contract. Each Offeror shall inform itself of, and shall comply with federal and territorial statutes and ordinances relative to the executing of the work. This requirement includes but is not limited to applicable regulations concerning protection of public and employee safety and health, environmental protection, historic preservation, the protection of natural resources, fire protection, burning and non-burning requirements, permits, fees, and similar subjects. 12. WITHDRAWAL OF PROPOSAL: Any proposal may be withdrawn prior to the scheduled time for the opening of proposals by notifying ASPA in a written request. No proposal may be withdrawn after the time schedule for opening of proposals. 13. OPENING AND EVALUATION OF PROPOSALS: In accordance with the ASPA Procurement Code Section 3-110, proposals will be opened and recorded as part of the record for the Source Evaluation Board on the assigned date and at the time indicated above at the Materials Management Office located in the Tafuna Power Plant Compound or in another place designated by the ASPA Materials Manager in writing. 14. RFP CONDITIONS: This RFP does not commit the American Samoa Power Authority (ASPA) to award or to pay any cost incurred in the preparation of a proposal. ASPA reserves the right to: a. Reject all proposals and reissue a new or amended RFP; b. Reject any Offeror for being non-responsive to proposal requirements contained in this RFP; c. Request additional information from any Offeror submitting a proposal; d. Select an Offeror for award based on other than least cost ; (e.g. capability to complete work in a timely fashion or evidence of good work experience); e. Negotiate a contract with the Offeror selected for award; and/or f. Waive any non-material violations of rules contained in this RFP. A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 12

13 ASPA reserves the right to issue any addenda to this RFP. Offerors shall send ASPA a signed form confirming receipt of any addendum and shall submit supporting/additional information as required by any addendum. In the event that an Offeror fails to acknowledge receipt of any such Addendum in the space provided, his proposal shall be considered irregular and will be accepted by ASPA only if it is in ASPA s best interest. In the event that addenda are not received until after the Offeror has submitted its proposal, a supplementary proposal may be submitted revising the original proposal. Such supplementary proposals must be received by ASPA prior to the scheduled time for opening of proposals. 15. REPRESENTATION REGARDING ETHICS IN PUBLIC PROCUREMENTS: The Offeror or contractor represents that it has not knowingly influenced and promises that it will not knowingly influence an ASPA employee to breach any of the ethical standards and represents that it has not violated, it is not violating and promises that it will not violate the prohibition against gratuities and kickbacks set forth in the ASPA Procurement Rules Section REPRESENTATION REGARDING CONTINGENT FEES: The Offeror represents that it has not retained a person to solicit or secure an AAPA contract upon an agreement or understanding for a commission, percentage, brokerage, or contingent fee; except for retention of a bona fide employee(s) or bona fide established commercial selling agencies for the purpose of securing business. 17. COMPLIANCE WITH LAWS: Offerors awarded a contract under this solicitation shall comply with the applicable standards, provisions and stipulations of all pertinent Federal and/or local laws, rules and regulations relative to the performance of this contract and the furnishing of goods. 18. AWARD, CANCELLATION, AND REJECTION: Award shall be made to the lowest responsible and responsive Offeror, whose proposal is determined to be the most advantageous to the American Samoa Power Authority, taking into consideration the evaluation factors set forth in this solicitation. No other factors or criteria shall be used in the evaluation. ASPA reserves the right to waive any minor irregularities in the proposal received. ASPA reserves the right to increase or decrease the A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 13

14 quantity of the items for award and make additional awards for the same type items based on the quotation prices for a period of thirty (30) days after the original award. A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 14

15 ATTACHMENT A PROPOSAL TRANSMITTAL FORM Date: AMERICAN SAMOA POWER AUTHORITY AMERICAN SAMOA GOVERNMENT Ladies/Gentlemen: The undersigned (hereafter called an OFFEROR), hereby proposes and agrees to furnish all the necessary information pertaining to: RFP NO. FY ESD.RENEWABLE ENERGY Renewable Energy Integration Study for the ASPA Power Grid in accordance with the Scope of Work, General Terms and Conditions, and other procurement requirements specified in this document for the prices stated in the itemized proposal form(s) attached hereto, plus any and all sums to be added and/or deducted resulting from all extra and/or omitted work in accordance with the unit and/or lump sum prices stated in the itemized proposal from attached hereto. The undersigned has read and understands the proposal requirements, and is familiar with and knowledgeable of the local conditions at the place where the work is to be performed. We have read the RFP Instructions and General Terms and Conditions attached to ascertain that all of the following (see boxes checks) requirements of the proposal are submitted in the proposal envelope in single at the date and time for proposal opening. Signed SEAL Date A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 15

16 ATTACHMENT B SCOPE OF WORK Study Approach and Scenarios Large-scale variable renewable generation presents several potential challenges for operating small island grids like the ASPA power system. With no electrical interconnection to neighboring systems, the island of Tutuila must manage its system frequency independently. To maintain adequate system performance during unexpected grid events, the spinning reserve requirement for the island of Tutuila is 5 MW to provide sufficient power should the largest ASPA unit unexpectedly trip off. The loss of a single generator unit in ASPA system can have significant impact on system performance due to its small size. This characteristic makes it necessary to accurately capture and model the dynamic capabilities of each existing diesel generator and future wind and PV units, other unique characteristics of the ASPA system (load dynamics, under-frequency load shedding (UFLS) schemes, etc.), and performance of ASPA s automatic generation control (AGC) that is responsible for scheduling and dispatching each unit to maintain system stability in different time scales (sec-min-hours). Over past decade, oil prices have spiked due to global politics and increased demand. The variability of oil prices directly impacts the cost of energy to the consumer on islands like American Samoa. The primary source of savings that results from renewable integration is reduced diesel-fueled generation output in ASPA grid. The calculated ASPA operating costs will depend largely on the assumed cost data for ASPA diesel generation and the cost of the future renewable generation. Fuel prices have been very volatile during the past decade, and it is hard to forecast their future prices. In evaluating the production cost of ASPA generation we recommend using a range of possibilities: 1. Flat assumes 5% annual growth rate of oil prices 2. Moderate assumes 7.5% annual growth of oil prices 3. High assumes 10% annual growth of oil prices The proposed study scenarios are shown in Table 2 for different wind and PV installed capacities, and must be used as a guideline in the study. The renewable penetration level here is defined as a percentage of peak system load. The peak instantaneous renewable penetration can be larger than the ones defined in Table 2, and can have significant impact on ASPA system stability and reliability. For each scenario, the modeling needs to be performed to identify system performance and operating characteristics such as unit commitment and dispatch, reserve requirement, wind and solar energy delivered, fuel consumption, total variable cost, A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 16

17 diesel units ramping, system frequency performance during transient contingency events, and system frequency performance during wind and solar ramping events. Following these assessments, potential strategies need to be identified and simulated to improve ASPA system performance (such as increasing wind and PV plant capacity factors, improving system reliability, increasing system efficiency, and using energy storage technologies). For high penetration scenarios, there can be periods when the ASPA system is not able to accept all available wind energy during the system minimum load periods, so excess wind energy will have to be curtailed. During the periods of curtailment, the diesel units will be operating at low power output, and therefore at lower efficiency. The study should put a specific emphasis on the operational strategies to allow accepting more wind energy by ASPA system including utilization of energy storage. The study should also address the economical and the stability impact of renewable penetration from the base demand to peak demand varying from 16 MW to 23 MW. Table 2: Study scenarios Scenario Wind Capacity (MW) PV Capacity (MW AC ) Penetration (% of peak load) Baseline (year 2013) Scenario 1 (Horizon year 2014) Scenario 2 (Horizon year 2016) Scenario 3 (Horizon year 2018) Scenario 4 (Horizon year 2020) Scenario 5 (Horizon year 2022) The system baseline models for both production cost and dynamic simulations must be established for the year The available system performance data shall be used to validate these baseline models, and build confidence in the scenario models incorporating various renewable scenarios. Models for each scenario will be developed for corresponding horizon years with inclusions of projected load and generation growth, and oil prices. The types of wind turbines and PV generators that may be installed in ASPA's system in the future are unknown. In this study, we propose that all wind turbine generators are represented by Type 3 generic model (wind turbine using double-fed induction generator). According to present market trends, new wind turbines will likely be either Type 3 or Type 4, the latter referring to a machine that is decoupled from grid by a full size power converter. The use of Type 3 model in the integration study is considered more conservative from the standpoint of reactive power supply, voltage control and short circuit contribution. Type 1 (squirrel cage induction generator) and Type 2 (variable slip) wind turbine topologies (both constant speed) A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 17

18 have been used in small island systems. These turbines are considered to have low energy capture and high reactive power demand compared to Types 3 and 4 that are variable speed. However, Type 1 and 2 can be considered in the analysis as well if consultant can provide rational for it. The capacities, locations, and points of interconnection (POI) for individual wind turbines generators or whole wind power plants will be determined by ASPA before the study start date. ASPA realizes that individual plant size and geographical distance between them will have impact on aggregate wind power variability. PV arrays are connected to the transmission grid by a full size power converter. In this study, a generic PV model utilizing voltage source inverter topologies can be used. Similar to wind, the capacities, locations, and points of interconnection (POI) for individual PV plants will be determined by ASPA before the study kickoff date. It is possible that certain portions of PV capacities for scenarios listed in Table 2 will include distributed roof-top PV installations. For this study we assume that all PV generation will be in the form of large MW-scale plants connected to ASPA feeders. The study should also determine the limit of how much wind or PV generation can be connected to any of ASPA s feeders based on individual feeder characteristics and loads. Modern power electronic coupled wind and PV generation can provide a range of ancillary services to the grid. Such services include variable generation providing both primary and secondary frequency control, voltage/reactive power control, and voltage fault ride-through capabilities. The need for such services must be evaluated, and if necessary included into the models for estimating impacts on operation cost and of ASPA power system. One important reliability impact of inverter coupled generation is the reduction in overall system mechanical inertia. This impact will be critical during high wind power penetration at light loads. It is expected that such reduced inertia at high penetration levels will result in high rates of change of frequency (ROCOF) and deeper frequency nadir. This will increase instances of involuntary load shedding to avoid system blackouts. Modern variable speed wind turbines are capable of providing inertial response (special control needs to be enabled). PV plants do not have such capability due to lack of rotating mechanical mass. Synthetic system inertia can be emulated by energy storage devices. The study should evaluate the impact of reduced system inertia, and propose and model solutions to mitigate the reliability risks associated with low system inertia. The wind and solar resource forecast is a useful tool that can reduce impacts of variability, and change the rules for committing diesel generation units. State-of-the-art wind and solar power forecasting can help ensure that ASPA commits an adequate amount of cycling and fast-start A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 18

19 units are on at a 4-hour ahead basis. The role of forecasting as a mitigation strategy must be explored in the study. Renewable Resource Data Due to the variable nature of wind and solar resources, the output of wind and PV generation will highly depend on resource variability. Characterization of such variability at different time scales is one of the critical inputs to any renewable integration study. Currently, there is a 1.5 MW PV plant operating near Pago Pago s airport with an additional 700 kw of roof top mounted PV systems. The solar irradication and power output time series data from this installation can be used to analyze the variability of solar resource, and model output PV plants in other parts of Tutuila. ASPA also has wind resource data from meteorological towers in several locations in Tutuila that can be used to evaluate the hour-to-hour variability of wind resource. Modeling tools will need to be used for simulating short-timescale sub-hourly (sec-tosec or min-to-min) variability. Some data on the Tutuila wind resource are shown in Appendices B and C. More data will be available from ASPA before the study kickoff date. Study Tasks The American Samoa Power Authority s renewable energy integration study will focus on impacts in three major areas: reliability, performance, and economics of the power supply. The study flow is envisaged in the following five major phases: 1. Production cost modeling a. Use the guideline of renewable generation mixes shown in Table 2 as an input to an energy modeling software to determine how wind and solar resource can be optimally integrated into ASPA s grid a. Develop dispatch scenarios for ASPA diesel generation for each renewable penetration level b. Determine if energy storage is necessary to achieve the desired penetration levels c. Re-tune each scenario with different wind and PV ratios in the renewable mix to achieve lowest capital and operating expenses for each penetration level d. Perform production cost modeling of all scenarios at peak and light loads with detailed results on cost of energy, fuel savings, spinning reserve requirements, impacts on diesel generation O&M costs, reduced emission levels, reliability assessment. e. Investigate role of wind and solar resource forecasting on production costs A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 19

20 2. Steady State Analysis a. Develop a steady-state model of ASPA s power system for each penetration scenario and for both peak and light load cases using standard power flow modeling software b. Investigate steady-state voltage stability and thermal line loading impacts at all penetration levels and load cases c. Identify voltage and thermal problems, propose and simulate mitigation measures for each penetration scenario 3. Dynamic modeling / Stability Analysis a. Once production cost modeling results were deemed reasonable, standard dynamic modeling tools will be used to identify the hours of the year to simulate ASPA system performance under disturbances; b. Perform dynamic simulation for the largest ASPA contingency event for all study scenarios, and verify system s ability to provide adequate frequency response and restore its nominal frequency without load shedding or tripping off diesel generators due to under/over speed protection c. Perform dynamic simulations under highest wind and solar up and down ramps, and verify systems ability to provide stable operation during such weather driven ramping events d. Identify mitigation measures for high penetration scenarios (such as additional spinning reserves, wind providing inertia/frequency response or energy storage) in case system is not able to demonstrate stable performance under above conditions, and perform simulations to show improved system performance e. Perform transient simulation under self-recovering voltage faults for all penetration levels and load conditions to verify systems ability to continue reliable operation (low voltage ride-through, or LVRT capability) f. Propose and simulate mitigation measures in case of unsatisfactory transient performance for certain scenarios and load conditions 4. Short Circuit Analysis a. Perform short circuit analysis for all power flow cases under each penetration level and dispatch scenario A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 20

21 b. The short circuit analysis should include 3-phase, single and double line-toground faults c. The short circuit currents must be compared with lowest circuit breaker duties provided by ASPA for each substation 5. Individual Feeder Analysis a. Perform steady-state analysis on each individual ASPA feeder to determine the limit of variable wind and PV generation b. Propose measures to increase levels of installed wind and PV capacities for each feeder A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 21

22 Appendix A: ASPA Installed Diesel Generation in the Island of Tutuila Grid System Power Station Engine Type Year Installed Capacity MVA Installed Capacity MW Derated Capacity MW Tutuila Tafuna Satala GS001 CAT 3516C GS002 CAT 3516C GS003 CAT 3516C GS004 CAT 3516C GS005 CAT 3516C GS006 CAT 3516C GS007 CAT 3516C GS008 CAT 3516C GS009 CAT 3516C GS010 CAT 3516C GS011 CAT 3516C Sub Total T2 Deutz BV12M643 T3 Deutz BV12M643 T6 Deutz BV12M643 T4 Deutz BV12M643 T7 CAT T8 CAT Sub Total Total A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 22

23 Appendix B: American Samoa Wind Energy Data Report Wind Energy Data Report As of April 28, 2003 Prepared by Jeff Shively Assistant Director for Technical Services May14, 2003 Site: Aoloau Village Antennae site. Elevation is 1971 feet above sea level. Anemometer location: Blue Sky Tower 30 and 20 meters above grade Data points: November 26, 2002 April 28, 2003 (3547 hours possible, 2845 hours logged) Sensors: Anemometers at 20 and 30 meters Direction vane at 30 meters Pyronometer Temperature Gauge Introduction: Meteorological instruments were installed on the Blue Sky tower at Aoloau to determine the potential for wind energy power generation. Anemometers were installed at 30 and 20 meters above grade. A wind direction instrument was installed at 40 meters. A pyronometer and a temperature gauge were also installed. The pyronometer was installed to determine the amount of solar radiation present at that location. This report addresses only the wind data collected to date. The instruments are all connected to a remote data acquisition system owned by the Territorial Energy Office. Of the 3547 hours the instruments have been installed, data was collected for only 2854 hours. At this location, the data logger receives too much RF interference to reliably transmit data to the mother computer at the Territorial Energy Office. After several attempts in December and January to correct the interference and on the advice of the data logger manufacturer, TEO began manually downloading the data at the site. Data collection was 100 percent successful when downloaded manually. The RF interference should not be a problem at any other site in the Territory. Summary of Data: Table 1 shows the number of hours and percent of hours the wind blows in each wind class. Wind classes are used to generalize wind energy potential. A wind class of 3 or above is generally considered economically competitive with fossil fuel power generation. However, several factors can impact the feasibility such as construction costs and the system A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 23

24 size. These will need to be examined in detail before a final assessment of the wind energy potential is determined. The data-gathering period (late November April) is coincident with the region s seasonal period of low wind speeds. May through November is the period when the trade winds blow the most. May though November wind speeds and the number of hours wind speeds meet or exceed Wind Class 3 are expected to be substantially higher than the data gathered so far. Table 1. Number of Hours per Wind Class <WC 3 WC3 WC4 WC5 WC6 WC7 Total hours % Of Tot hrs Table 2 provides the MPH and Meters per Second (m/s) for Wind Classes at 20, 30, and 50 meters. Table 2. Wind Class Performance at Various Elevations Above Grade Class Potential 20 Meters 30 Meters 50 Meters MPH M/sec MPH M/sec MPH M/sec 2 Marginal Fair Good Excellent Outstanding Superb The NRG Systems 9300 CELLogger samples each channel once every second then averages the samples once per hour. Average wind speed at 100 feet (30 meters) was 14.4 MPH or 6.4 meters per second (m/s) or WC3. Maximum average wind speed at 100 feet was 41.3 MPH or 18.5 m/s. Average wind speed at 66 feet (20 meters) was 12.4 MPH or 5.5 m/s or WC3. A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 24

25 Maximum average hourly wind speed at 66 feet was 34.1 MPH or 15.2 m/s. There were six occasions where the daily peak wind speed at 100 feet exceeded 50 MPH. The peak wind speed was 62.4 MPH. It occurred on 4/13/03 at 4:17 AM. The highest average hourly wind speed was 39.9 MPH (average of 360 samples during hour). It occurred on 3/06/03 between noon and 1:00 PM. Table 3 shows the number of hours and the percent of hours that wind energy power generation was feasible during peak demand hours (Wind Class 3 or higher). There were 125 possible hours for each of the three hours in the table. Table 3. Coincident Wind Energy vs. Peak Demand 6 PM 7PM 8PM Number of Hours Percent of Hours 50.4% 52.8% 48.8% Conclusions: The data gathered to date is insufficient to make a reliable determination of the wind energy potential at this site. More data is required. Additionally, this data needs to be compared to other wind data gathered at both NOAA stations. A comparison of the data will enable us to estimate annual averages that can then be used to determine the wind resource potential. Based on the data collected so far, it is reasonably clear that the site will show favorable wind energy potential and that annualized data will probably match the wind class map in the 1990 Renewable Energy Plan of Action for American Samoa. Wind energy has potential as a fuel reduction strategy but not as a peak demand reduction strategy (see Table 3). Plans: Data will be gathered at this site through at least November Two more sites will be assessed beginning in June or July of 2003 using equipment recently purchased by ASPA. These sites have not been selected, but Ofu and Ta u Islands have been discussed. Further analysis of the Aoloau site is forthcoming. The results will include a Wind Rose for the site and a cost/benefit estimate of electricity generation potential based on a few different turbine selections. Recommendations: The area between the Blue Sky tower and the FAA tower is vacant and on initial inspection appears to be a good location for a wind turbine. Assurances have been made by the Department of Energy that turbines will not impact the ASTCA, Blue Sky, or FAA towers performance. The site should be reserved by ASPA for a near future wind turbine pilot project. A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 25

26 Appendix C: Wind Resource for Tutuila Island A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 26

27 A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 27

28 ATTACHMENT C PROPOSAL COST FORM TO: American Samoa Power Authority, Attn: Materials Manager ADDRESS: PO Box PPB, Pago Pago, American Samoa TITLE: RFP NO. OFFEROR: RENEWABLE ENERGY INTEGRATION STUDY for the ASPA POWER GRID FY ESD.RENEWAL ENERGY DATE:, 2013 Gentlemen/Ladies: The undersigned, (hereafter called an Offeror ) hereby proposes and agrees to furnish all the necessary information to the Task Cost Proposal Form attached in accordance with the Scope of Work, and other procurement requirements specified in these documents for the prices stated in the itemized Task Cost Proposal form(s) attached hereto, plus any and all sums to be added and/or deducted resulting from all extra and/or omitted work in accordance with the unit and/or lump sum prices stated in the itemized quote form attached hereto. QUOTE Please see the SCOPE OF WORK specifications and to submit line item quote prices. IN WITNESS THEREOF, the undersigned has caused this instrument to be executed by its duly authorized officers on this day of, OFFEROR: By: Date: Name: Title: Seal A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 28

29 TASK COST PROPOSAL PROPOSAL FORM: Renewable Energy Integration Study for the ASPA Power Grid (Offeror may add more rows as needed) Company Name: ALL TASK COST PROPOSAL MUST BE QUOTED IN US DOLLARS AND ALL LINES MUST BE COMPLETED For any additional items or costs, offerors must add lines to this proposal and specifically describe each item. Item Task Description Costs Proposal 1 Production cost modeling Use the guideline of renewable generation mixes shown in Table 2 as an input to an energy modeling software to determine how wind and solar resource can be optimally integrated into ASPA s grid Develop dispatch scenarios for ASPA diesel generation for each renewable penetration level Determine if energy storage is necessary to achieve the desired penetration levels Re-tune each scenario with different wind and PV ratios in the renewable mix to achieve lowest capital and operating expenses for each penetration level Perform production cost modeling of all scenarios at peak and light loads with detailed results on cost of energy, fuel savings, spinning reserve requirements, impacts on diesel generation O&M costs, reduced emission levels, reliability assessment. Investigate role of wind and solar resource forecasting on production costs A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 29

30 2 Steady State Analysis Develop a steady-state model of ASPA s power system for each penetration scenario and for both peak and light load cases using standard power flow modeling software Investigate steady-state voltage stability and thermal line loading impacts at all penetration levels and load cases Identify voltage and thermal problems, propose and simulate mitigation measures for each penetration scenario. 3 Dynamic modeling / Stability Analysis Once production cost modeling results were deemed reasonable, standard dynamic modeling tools will be used to identify the hours of the year to simulate ASPA system performance under disturbances; Perform dynamic simulation for the largest ASPA contingency event for all study scenarios, and verify system s ability to provide adequate frequency response and restore its nominal frequency without load shedding or tripping off diesel generators due to under/over speed protection Perform dynamic simulations under highest wind and solar up and down ramps, and verify systems ability to provide stable operation during such weather driven ramping events Identify mitigation measures for high penetration scenarios (such as additional spinning reserves, wind providing inertia/frequency response or energy storage) in case system is not able to demonstrate stable performance under above conditions, and perform simulations to show improved system performance Perform transient simulation under self-recovering voltage faults for all penetration levels and load conditions to verify systems ability to continue A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 30

31 reliable operation (low voltage ride-through, or LVRT capability) Propose and simulate mitigation measures in case of unsatisfactory transient performance for certain scenarios and load conditions. 4 Short Circuit Analysis Perform short circuit analysis for all power flow cases under each penetration level and dispatch scenario The short circuit analysis should include 3-phase, single and double line-to-ground faults The short circuit currents must be compared with lowest circuit breaker duties provided by ASPA for each substation. 5 Individual Feeder Analysis Perform steady-state analysis on each individual ASPA feeder to determine the limit of variable wind and PV generation. Propose measures to increase levels of installed wind and PV capacities for each feeder TOTAL A M E R I C A N S A M O A P O W E R A U T H O R I T Y. F Y Page 31