Site work for a power facility in Fort Defiance, Arizona. Completed plans call for site work for a power facility.

Question Deadline 06/23/2025 at 5:00 PM MT All questions must be submitted in writing to Andrea Hale, Contract Administrator via email at andreah@ntua.com. NTUA will only respond to written questions related to this IFB submitted by the question due date. All emails should have "Photovoltaic Power Systems - QUESTIONS" in the subject line. Navajo Tribal Utility Authority (NTUA) is a special purpose government entity of the Navajo Nation, which provides electric, water, wastewater, natural gas, photovoltaic, and communication services covering approximately 27,000 square miles across northeastern Arizona, northwestern New Mexico, and Utah. NTUA has seven main district offices located in strategic communities spanning the Navajo Reservation, with its corporate headquarters located in Fort Defiance, Arizona. Type of Service: NTUA is hereby contacting qualified suppliers to provide engineering, design and installation (turnkey) of up to eighty (125) stand-alone photovoltaic (PV) power systems. Part II - SPECIFICATIONS A. Scope - an initial project of (125) Stand-alone PV Power Systems that are equal or greater than 3.0 kW, with or without a small-scale wind turbine, rated not less than 400 watts output, as an additional power system with battery storage, which may power water pump system. The power systems included in this IFB will provide primary power to new NTUA customers who live beyond the reach of the electricity grid and have a need for electricity and water in their homes. B. C. Includes the procurement of a up to total of (125) power systems, with all power systems being installed by the winning Bid(s) and if the Bidder is not able to install all or a portion of power systems, Bidder will be responsible for coordinating such installation either through a third party or by NTUA. Based on NTUA's procurement needs, NTUA requests that Bidders provide cost breakdowns of the following groups : of (40) of (85) of (125) units for delivery and installation in (12) months. NTUA will secure a minimum of (85) power systems and NTUA will reserve the right to purchase additional (40) power systems but will not be obligated to purchase the additional power systems. The purchase of an additional (40) units is contingent upon the current solar contractor and of their ability to supply the additional 40 units in a effective manner. D. E. F. G. Customer Identification Process: NTUA will coordinate with the selected Bidder(s) regarding which customer homes to install the power systems. The selected Bidder(s) will coordinate with NTUA regarding whether equipment may be drop-shipped directly to customer locations or drop-shipped to an NTUA location. A portion or all this solicitation may be funded by the Federal grant dollars and any successful Bidder may be subject to adhering to federal flow down provisions which include, but are not limited to, providing the NTUA with timely reporting to satisfy stringent and transparent reporting requirements. Bidder(s) will provide accurate & comprehensive program management, daily update meetings & progress reporting tools, project engineering, turn-key installations. High level project management progress reports will be required, and NTUA must be able to track projects on a web-based project management platform. General 1. Furnish and install a stand-alone PV power system with or without a small-scale wind turbine for primary power to residences located in the NTUA service area. The cumulative sizing of the PV array shall not be less than 3,000w (3.0 kW) and shall not be less than 800Ah battery bank- lithium battery solution are recommended or have an energy capacity to deliver not less than 9,000 watt-hours per day (sizing is calculated at 400 watts of continuous load and no less than 3 days of autonomy at 80% Depth of Discharge). Collectively, the PV array and available battery tie-in connection will comprise of the base load power supply for NTUA customers, the wind turbine power will complement the primary solar output. 2. The PV component of the power system (PV structure) shall be contained within a single, stand-alone structure designed for ease of access to the PV modules (array) and the balance of system (BOS) for periodic operation and maintenance (O&M) activity by NTUA personnel. Wind Turbine if applicable, shall be contained within the stand- alone structure. The complete system must be designed for simple installation and removal, system shall not be permanent to its installation site. It is desirable that the PV structure be physically distant from the residence to limit intrusion into customer's personal living space. There shall be minimal site alterations. Site location will be recommended by NTUA staff. 3. The stand-alone power system must be able to communicate wirelessly to monitor operations of the system by NTUA staff. Monitoring systems will be able to provide detailed system information as related to system health and customer electrical load profiles. System will have the ability to remotely turn power on and off to the homes load center. NTUA will look favorably upon utilizing our current monitoring systems (Samsara IG41). All proposed monitoring systems will have data acquisition ability and must work wirelessly and remotely through cell data coverage. 4. The power system structure shall be constructed with materials which tolerate elements characteristic of high plains desert and mountainous terrain, made to withstand extreme heat and frigid conditions, and protect system components from dust and sand stirred by high winds. The power system structure shall be comprised of metal-based enclosures which will incorporate weather resistant seals applicable to the NEMA rating. Wind turbines must be rated to tolerate the Navajo Nation's weather variations and conditions. 5. The power system structure shall incorporate features which make the system tamperproof from customer abuse or from rotating/moving the array or any component parts. The power system enclosure will be lockable. Locks & keys must be provided by the successful bidder at the time of installation for all system enclosures. The power system must have a remote shut-down feature which may be used for delinquency of payment or emergency shutdown. 6. The power system shall incorporate a feature to allow the customer to attach a generator in the event of an outage. A 120 volt and/or 240-volt RV receptacle must be incorporated into the power system. An adapter must be provided- if needed. 7. The power system solution shall incorporate customer tools which provide the state of charge of the battery and status of the system and limit the opportunity for customer overuse and abuse. The power system must be able to display battery state of charge outside the enclosure and use Bluetooth technology to educate customers on battery state of charge. Additional display may be needed, to minimize customer from gaining access to settings of the inverter. 8. The power system shall also include, and supply, power to an 18 cubic feet refrigerator to be located in the home, which meets or exceeds Energy Star standards. The power system should be designed to provide dedicated and continuous power to the refrigeration system, in addition to providing power to the residence and the water pump system. Dedicated power to the refrigerator is optimal. 9. The power system shall also be capable of powering a water pump with a minimum AC power requirements of 120 volt, _ horsepower to lift water up about 25ft from the ground and across a lateral distance of not more than 250ft. Although it is preferred that the water pump be provided as a component to the power system, at a minimum the power system should have a dedicated interconnection point for the water pump meeting these standards, while still meeting the electrification needs of the customer, including the operation of the refrigerator. If a water pump is proposed as an option, it shall be enclosed in its own enclosure. 10. Installation shall include all tasks required from the drop-shipment location on the Navajo Nation to the point that the PV power system, refrigeration system and water pump are operational to each customer's satisfaction. These tasks include and are not limited to transportation of all required components and equipment to the customer's residence; all construction, assembly, laying of conduit, interconnection of renewable energy power sources to the customer's service entrance, and other activities required NTUA standard guidelines for installation PV Power Systems and interconnecting to home load centers. 11. Bidder shall address the ease-of-use features for the customer and long-term maintenance features for NTUA personnel. Use of any special tools for installation, removal or O&M shall be specified in the response to IFB, and all special tools and equipment shall be provided totaling eight (8) complete sets. 12. The refrigerator shall plug into the customer's 120-volt standard AC outlet. 13. Wind turbine must be rated to tolerate the Navajo Nation's weather variations and conditions. Wind turbine must be easily accessible for ease of operations and maintenance. Wind turbine must be rated not less than 400-watt output. Wind turbine must be a sealed unit to minimize intrusion of water and dust, mast must attach to the power system structure. Mast must be a minimum of 20 feet in height. 14. The PV Power System installation cannot require construction or structural modification to customer dwelling.