Cooperative purchasing is a mechanism that lets public agencies - states, cities, counties, school districts, universities, utilities, transit authorities, and eligible nonprofits - buy off contracts that another public entity has already competitively solicited. Instead of running its own RFP, an eligible agency "piggybacks" on a cooperative contract and issues a purchase order directly.

The economic argument is simple: a single high-quality RFP process, run by one competent lead entity, replaces hundreds of duplicative procurements across smaller agencies. Per NASPO ValuePoint's cooperative-purchasing FAQ, cooperative contracting aggregates the demand of "all 50 states, the District of Columbia, and the US territories" through the Lead State Model - one state runs the procurement, and every state, plus their political subdivisions, can use the resulting contract.

For electrical procurement specifically, the four cooperatives that matter are:

• Sourcewell - a Minnesota government agency operating a national cooperative. Manages electrical, MRO, generator, and utility distribution contracts including the Wesco contract 091422-WES covering electrical supplies, lighting, utility distribution, and safety supplies through 2027, and the Cummins contract 092222-CMM for diesel and natural gas generators.
• OMNIA Partners - the largest cooperative for state and local procurement in the U.S. by contract volume, serving public and private sectors. Uses lead-agency solicitations from major public entities like Region 4 ESC (Texas), Region 10 ESC, and Association of Educational Purchasing Agencies. Offers electrical, MRO, and facilities contracts.
• TIPS (The Interlocal Purchasing System) - a Texas-based cooperative used broadly by K-12 schools, higher ed, and municipalities across all 50 states. Strong in facilities-services, HVAC, and electrical trade contracts.
• NASPO ValuePoint - the contracting arm of the National Association of State Procurement Officials, covering all 50 states. Uses the Lead State Model where one state runs the procurement on behalf of all participating states. Strong in commodities, technology, fleet, and some construction categories.

PES-stocked brands appear on cooperative contracts through two mechanisms: (1) direct contracts held by manufacturers or major distributors, and (2) flow-through where a cooperative-contracted distributor (like Wesco under Sourcewell 091422) sources through PES for specific brands or SKUs.

Sourcewell is a Minnesota government agency created in 1978 as a K-12 service cooperative and expanded over 40 years into a general cooperative purchasing organization. Sourcewell holds no-cost membership for public agencies (with an active membership base measured in the hundreds of thousands) and runs national RFPs whose resulting contracts are available to every participating member.

For electrical work specifically, Sourcewell contract 091422-WES with Wesco Distribution is the workhorse. Products and services covered include:

• Electrical supplies (wire, conduit, boxes, devices, terminations)
• Lighting supplies (LED fixtures, lamps, controls)
• MRO supplies
• Data and telecom supplies
• Utility distribution supplies (transformers, switchgear, poles)
• Physical security hardware
• Safety supplies
• Material support products
• Door locking solutions
• Audio-visual products
• Energy-efficient solutions
• Supply chain services

Maturity date on the Wesco contract is November 8, 2027, meaning agencies can use it through that date. Per the contract listing on Sourcewell's site, agencies contact Kelly Cassidy (kelly.cassidy@anixter.com, 412-537-8750) or Russell Rinn (russell.rinn@wescodist.com, 737-306-8276) to purchase.

Sourcewell contract 092222-CMM with Cummins covers electrical energy power generation equipment: diesel generators, natural gas generators, automatic transfer switches (ATS), switchgear, and turnkey solutions. Maturity date is November 22, 2026 - meaning that as of publication this contract is in its final year and will re-compete. Agencies planning generator purchases 2026-2027 should check the successor contract as it becomes available.

How PES-stocked brands touch Sourcewell contracts: Wesco and Anixter (which merged in 2020) source many stocking SKUs through the same manufacturer channels PES uses. Solar-specific brands (Sol-Ark, MidNite Solar, OutBack Power, Fortress Power, IronRidge, Unirac) may or may not be on the Wesco Sourcewell catalog depending on whether Wesco has priced them. Public agencies with a specific brand requirement should ask Wesco to add the SKU to their Sourcewell price file, or use one of the other cooperatives (OMNIA, TIPS) that have alternative distributors on contract.

Sourcewell's Sparking New Opportunities program extends the cooperative into infrastructure and construction categories - including some renewable energy, EV charging, and utility distribution work.

OMNIA Partners is a private company managing the largest cooperative purchasing program for state and local government by contract volume. OMNIA absorbed U.S. Communities and National IPA (National Intergovernmental Purchasing Alliance) in 2020, consolidating three of the largest cooperatives into one organization.

OMNIA holds contracts sourced through lead-agency solicitations. The most common lead agencies for electrical work include:

• Region 4 Education Service Center (Texas) - runs many facilities and electrical solicitations that public agencies nationwide use
• Region 10 Education Service Center (Texas) - active in HVAC, mechanical, and facility-services solicitations
• Association of Educational Purchasing Agencies (AEPA) - nationwide K-12 focused
• City of Kansas City, MO - janitorial and facilities
• Cobb County, GA - MRO and industrial supplies

For electrical distribution, OMNIA contracts include major manufacturers and distributors - Graybar, Border States Electric, Rexel, and specialty solar suppliers. Contract terms are 3-5 years with renewals.

How to use OMNIA: Public agencies register as OMNIA participating agencies (free), then purchase directly from OMNIA-contracted suppliers at the contracted prices. The lead agency's original competitive solicitation satisfies the "competitively bid" requirement most public procurement laws impose.

Some states require the public agency to formally piggyback on an out-of-state cooperative - typically a resolution by the governing body naming the specific cooperative and contract. Confirm the local procurement code requirements before committing to a purchase.

The Interlocal Purchasing System (TIPS) is administered by Region 8 Education Service Center (Pittsburg, TX) and serves as a national cooperative primarily for K-12 school districts, higher ed, and municipalities. TIPS members can be found across all 50 states, and contracts cover a broad range of trade-specific categories.

For electrical work, TIPS holds contracts covering:

• Electrical distribution products (wire, conduit, switchgear, panelboards, transformers)
• Lighting and controls
• Generators and standby power
• Solar photovoltaic and energy storage installation
• Electrical trade services (installation, maintenance, testing)
• EV charging equipment and installation

TIPS contracts are typically 3 years with renewal options. Members access contracts through the TIPS Vendors page, request quotes directly from awarded vendors, and purchase at the contracted terms.

TIPS advantages for solar/electrical work: because TIPS is heavy in K-12 and municipal buyers, its electrical contracts include trade-services categories that Sourcewell's product-focused contracts sometimes miss. A school district looking to install a rooftop solar system and battery backup can often find both the equipment supply and the installation contractor on TIPS, satisfying local procurement law with a single cooperative-contract purchase.

A common workflow: the district issues an internal purchase order to a TIPS-awarded solar contractor. The contractor supplies materials sourced from a TIPS-contracted distributor or through their own supply chain, at TIPS pricing terms. The distributor may include PES-stocked brands under their catalog.

NASPO ValuePoint is the contracting arm of the National Association of State Procurement Officials - a nonprofit representing state procurement officials of all 50 states, D.C., and the U.S. territories. Per NASPO ValuePoint's own description, it's a "unified, nationally focused cooperative alliance aggregating the demand of all 50 states."

NASPO operates on the Lead State Model. One state runs the competitive solicitation on behalf of a multi-state sourcing team. Once the contract is awarded, every participating state - plus their political subdivisions - can use the contract. Per NASPO ValuePoint's supplier information, eligibility to use NASPO contracts extends to all state agencies plus cities, counties, K-12 districts, higher ed, tribal governments, and eligible nonprofits.

NASPO's strongest electrical-adjacent contracts include:

• Copiers and multi-function devices
• IT hardware
• Fleet vehicles and EVs
• Body armor and safety equipment
• Data communications and telecommunications
• Managed print services

NASPO's role in traditional electrical distribution is smaller than Sourcewell or OMNIA - most agencies looking for wire, switchgear, or solar equipment lean on Sourcewell or a regional cooperative first. But NASPO's EV and fleet contracts are increasingly important as agencies electrify fleets, which drives EV charging infrastructure purchases through follow-on procurements.

The Lead State Model produces some of the most legally defensible cooperative contracts because the solicitation process is designed with a multi-state review committee. State agencies concerned about audit exposure often prefer NASPO contracts specifically for that reason.

Getting on a cooperative contract as a vendor is a multi-month process that resembles pursuing a GSA Schedule. Here's what each cooperative requires:

Distributors and manufacturers with existing regional or national footprints have a substantial edge - cooperative RFPs weight past-performance heavily, and evaluators look for evidence you can deliver at scale across many geographies. Small businesses can compete when they team with larger primes or focus on regional cooperatives (Sourcewell has geographic scope but many state-specific cooperatives exist as well).

The alternative to being on a cooperative directly: sell through a cooperative-contracted distributor. This is where PES's role matters most for many stocking manufacturers. Wesco, Graybar, Border States, Rexel, and Sonepar hold cooperative contracts across most states and cooperatives. When they need to supply a specific solar or renewable-energy SKU that isn't in their core stocking file, they source through PES - and the public agency ends up buying a PES-stocked product at cooperative-contract terms without either party having to run a new procurement.

For contractors installing on cooperative-funded projects, the equipment they buy from a cooperative-contracted distributor flows through the cooperative's terms. Confirm those terms cover the specific SKUs you need before quoting - if a distributor's Sourcewell catalog doesn't include the specific inverter you specified, you have three options: (1) get the distributor to file a catalog modification, (2) buy the equipment on an open-market side-order outside the cooperative, or (3) substitute a SKU that is on the cooperative catalog.

1. 1

   Verify your legal authority to piggyback

   Your state's procurement code and your agency's own procurement policy govern whether and how you can use an out-of-state cooperative. Some states require a formal resolution by the governing body. Others require a documented determination that piggybacking serves the public interest. A few require the cooperative's solicitation to have been made available to your state's suppliers before award. Check your local rules before spending time on the mechanics.

2. 2

   Confirm the cooperative is eligible for your entity

   Sourcewell, OMNIA, TIPS, and NASPO have slightly different eligibility rules. Sourcewell allows a very broad member base including municipalities, K-12, higher ed, tribes, and eligible nonprofits. NASPO focuses on state agencies and their subdivisions. Register your agency as a member of the specific cooperative before you buy.

3. 3

   Confirm the contract you want to use is active

   Every cooperative contract has an expiration date. Some have renewal options that require exercise before expiration. Verify the contract you want to use is currently active and will remain active through your delivery date. Sourcewell's contract listing pages show maturity dates clearly.

4. 4

   Confirm the specific SKUs and services you need are on the catalog

   A distributor's Sourcewell contract covers 'electrical supplies' broadly - but not every SKU is on their contract price file. Ask the distributor for the specific SKU on the specific contract. If the SKU isn't there, ask them to file a modification or find an alternative.

5. 5

   Issue the purchase order referencing the cooperative contract

   Your PO must reference the specific cooperative contract number (e.g., 'Sourcewell 091422-WES'). This is what makes the purchase legally cooperative-derived rather than an open-market buy. Your finance team's audit trail depends on the PO citation.

6. 6

   Document the price-reasonableness determination

   Most state procurement codes still require the buyer to determine that the price is fair and reasonable. Cooperative-contracted pricing is presumed reasonable, but document the determination in your file - a one-page memo citing the cooperative contract number, the SKU quoted, and the price is usually enough.

7. 7

   Accept, inspect, and pay per your normal AP process

   Cooperative purchases follow your normal AP workflow after that. Retain the cooperative contract citation in your project files for the length of your records-retention policy - 7 years is typical for state and local agencies.

PES tracks cooperative-contract catalog inclusion for stocked brands. Below is the current picture for the four cooperatives that dominate our public-agency customer footprint. Because catalogs change with every distributor modification, always verify current inclusion with the awarded distributor before committing.

Public agencies with a specific SKU need that isn't obviously covered should register at the PES Axis distributor portal and ask our public-procurement desk to identify the fastest cooperative route. In many cases we can flag which cooperative-contracted distributor has an existing modification pathway to get your SKU on catalog within 30–60 days.

The most common mistake public agencies make: defaulting to cooperative-contract purchasing for every buy just because it's fast. Cooperative contracts are terrific for standard SKUs on typical volumes, but they lock you into the pricing and terms in the awarded catalog. For a large or specialty project with substantial complexity, running your own RFP often produces better pricing and terms.

The second most common mistake: running a direct solicitation for a small standard-SKU buy that could have moved through Sourcewell in three weeks. Every solicitation costs $8,000–$25,000 in staff time to run correctly. Below a $50,000 buy, that overhead often exceeds the marginal price improvement over a cooperative purchase.

Beyond the four national programs, dozens of state-specific and regional cooperatives operate in electrical procurement. Contractors and public agencies working within a specific state should know their local options:

• BuyBoard (Texas) - Purchasing cooperative operated by Texas Association of School Boards. Popular with Texas K-12 and municipalities; also usable by out-of-state members. Strong in facilities, HVAC, and electrical trade services.
• Choice Partners (Texas) - Managed by Harris County Department of Education. Broad category coverage including construction and electrical.
• Educational and Institutional Cooperative Purchasing (E&I) - National higher-ed cooperative. Strong in facilities and lab equipment; growing renewable-energy footprint.
• US Communities (now part of OMNIA) - Legacy brand still referenced in older contracts.
• Massachusetts Higher Education Consortium (MHEC) - Regional cooperative serving higher-ed institutions in MA, RI, CT, NH, and VT.
• Kansas City Regional Purchasing Cooperative, Metropolitan Educational Council (MEC, Ohio), and dozens of state-specific cooperatives - typically K-12 focused with facilities and MRO catalogs.

For solar and battery ESS work specifically, some states have launched clean-energy-focused purchasing programs - California's DGS master agreements for solar and storage, New York's NYSERDA-supported cooperative frameworks, and Massachusetts's OSD statewide contracts for solar installation are three of the strongest state-run examples. These state-specific programs often carry additional labor requirements (prevailing wage, apprenticeship utilization), local-content preferences, and stronger BABA/domestic-content specifications than the national cooperatives.

The best strategy for a public agency planning a solar or ESS buildout: check the national cooperatives first (Sourcewell, OMNIA, TIPS), the state's own master agreements second, and regional cooperatives third. Combine authorities where beneficial - for example, buying modules through a national cooperative and hiring installers off a state-run agreement is a common and defensible pattern.