Developer, EPC, Financier, Monitoring Vendor: Who Owns the Gaps?

A commercial solar project can have four or more companies touching it, and every one of them can do their job well while the project still disappoints you.

The developer finds the site, structures the deal, and secures the incentives. The EPC designs and builds the system. The financier funds it and sets the terms. The monitoring vendor tracks performance once it is running. Each has a clear scope on paper, and each can point to a signed contract showing they delivered what they promised.

The trouble lives between the scopes. That is where most owners get surprised, and it is rarely because anyone acted in bad faith. Every contract is written around its own edges, and nobody is paid to manage the seams.

This article is for owners, CFOs, asset managers, and operations leaders who are about to sign a solar contract, or who already operate a system and suspect it is not delivering what the proposal said. It maps the seven gaps that most often go unowned, explains why each one persists, and sets out what to write into your contracts and your operating routine so that someone is accountable for each. It is deliberately not another vendor-selection guide. Vendor evaluation is covered in How to Evaluate a Commercial Solar Company: A Rigorous Buyer’s Guide for 2026. This piece assumes the vendors are competent and asks a different question: when they each do their job, who is doing the job in between?

Who Does What on Paper

Before looking at the gaps, it helps to see where each party’s scope typically ends. The details vary by project, but the pattern is consistent.

Party	What They Typically Own	Where Their Responsibility Typically Ends
Developer	Site selection, deal structure, incentive strategy, often the interconnection application	Financial close or commissioning, depending on the arrangement
EPC	Design, procurement, construction, commissioning, workmanship warranty	Commissioning and punch-list closure, plus a defined warranty period
Financier (lender, tax equity, or credit buyer)	Funding, terms, covenants, reporting requirements	Does not manage the asset, but sets thresholds the asset must meet
Monitoring vendor	Data collection, dashboards, alerts	Reporting numbers; typically not diagnosing causes or dispatching repairs
O&M provider	Maintenance and repairs, if separately contracted	Whatever the O&M contract specifically names
Equipment manufacturers	Product and performance warranties on their hardware	Replacement or repair of defective equipment under warranty terms

Notice how many of the “ends” are expressed as events or time limits rather than outcomes. The EPC’s role ends at commissioning. The monitoring vendor’s role ends at reporting. The manufacturer’s role ends at the hardware. The outcome you actually care about, a system that produces what it was modeled to produce for 25 years, does not appear in any one party’s scope. It is the sum of all of them, and the sum is nobody’s job.

Gap 1: The Build-to-Operation Handoff and the First-Year Performance Gap

The EPC’s job ends at commissioning. The system is energized, the punch list is closed, and the crew moves on. But the first year of real operation is when design assumptions meet reality: actual shading, actual soiling, actual weather, actual equipment behavior under load.

If production runs below the model, whose problem is that? The EPC will point to the commissioning report showing the system met its acceptance tests. The developer will point to the EPC. The monitoring vendor will point out that they only report numbers, not cause. Each answer is defensible, and none of them produces a fix.

The yardstick problem. Before anyone can argue about who owns a shortfall, they have to agree there is one, and that requires an agreed benchmark. A surprising number of projects have three different yardsticks in circulation: the production estimate in the original proposal, a financier’s independent engineer model, and whatever expected-output calculation the monitoring platform uses. They are often built on different irradiance datasets and different loss assumptions. Two parties can look at the same year of production data and honestly disagree about whether the system is underperforming.

The guarantee that expires. Many EPC contracts include a production guarantee, but it typically runs for a limited period, often the first year or two, and is measured by a specified method against a stated baseline. After it lapses, the ongoing O&M agreement often guarantees equipment availability or response time rather than energy output. So in year three, a system can be fully “available” and still producing less than modeled, with no contract that makes anyone responsible for the difference.

An illustration. Consider a hypothetical 750 kW rooftop system modeled to produce 1,125,000 kWh per year, with electricity valued at $0.13 per kWh. A persistent 8 percent shortfall is 90,000 kWh, or about $11,700 per year, which adds up to roughly $292,500 over 25 years even before accounting for rate changes. If nobody owns that gap, nobody investigates it, and it simply becomes the system’s permanent performance. (These figures are illustrative assumptions; use your own system size, model, and rates.)

What to write into the contract:

A single, named baseline for expected production, including the data source and loss assumptions, agreed by the EPC, the owner, and any financier
A weather-corrected performance method, ideally supported by on-site irradiance measurement, so that “below model” can be separated from “bad weather year”
A clear statement of who owns investigation of a shortfall once the EPC’s guarantee period ends, and which contract carries that responsibility
A defined remedy, and a defined process, for a shortfall that exceeds the guaranteed threshold

The commissioning and first-year review practices described in A Practical Implementation Guide for Operations Leaders Pursuing Energy Independence are the operating counterpart to these contract terms.

Gap 2: The Alert Nobody Acts On

Monitoring platforms flag underperformance constantly: a failed inverter, a shaded string, a communication dropout, a tripped breaker. But a dashboard with a red light is not a repair.

Between the alert and the fix there is a chain of steps. Someone has to read the alert, decide whether it is real or a false alarm, determine the probable cause, dispatch a technician, authorize any cost, perform the repair, and confirm that production has recovered. If no contract names the person responsible for each step, the alert simply sits there while production is lost.

This gap is common precisely because each party can be doing exactly what its contract says. The monitoring vendor delivered the alert. The EPC’s workmanship warranty may not apply, because the problem is not a defect. The owner’s facilities team may not be watching a solar dashboard at all. The O&M provider, if there is one, may only respond to a call the owner places, and the owner does not know the call needs to be placed.

What to write into the contract and the operating routine:

Who watches. A named party, internal or external, with the job of reviewing alerts on a defined schedule, not “whenever someone notices.”
Severity tiers and response times. For example, a total system outage and a single underperforming string should not carry the same response commitment. Write down what each tier is and how fast the response must be.
Authority to dispatch. A pre-approved spending threshold below which the responsible party can send a technician without waiting for owner approval. Approval delays can cost more in lost production than the repair itself.
Closure verification. Someone confirms that production recovered, not just that a technician visited.
Reporting. A periodic summary of alerts raised, resolved, and outstanding, and an estimate of production lost, so the pattern is visible.

The distinction between monitoring and O&M is worth making explicit in procurement, because they are often sold as one thing and contracted as two. The specification detail for data quality, including metering and data export, is covered in Is Your Energy Data Audit-Ready? Why Solar Is the Foundation of 2026 Carbon Reporting, and the question of which monitoring features earn their cost is covered in Bifacial Panels, Trackers, and Premium Upgrades: Which Ones Actually Pay for Themselves?

Gap 3: Financing Covenants That Land on You

Lenders, tax equity investors, and other financing parties usually require specific reporting, insurance coverage, and performance thresholds. These show up as covenants in the financing documents: minimum production or availability levels, periodic performance reports, insurance certificates, maintenance standards, and notice requirements when something goes wrong.

The gap here is that the obligation and the capability sit with different parties. If the system misses a performance threshold or a report is late, the consequences land on the owner. But the data needed for the report sits with the monitoring vendor, the explanation for the shortfall sits with the EPC or O&M provider, and the maintenance records sit with whoever did the work. The owner is accountable for a deliverable that other parties control.

What to do:

Before closing, extract every reporting and performance obligation from the financing documents into a single list, with due dates and required content
Match each obligation to the party who will actually produce the underlying data or action, and make sure that party’s contract requires them to supply it, by when, and in what format
Confirm that the O&M and monitoring contracts can support the financier’s required maintenance standards and reporting cadence, not just the owner’s general expectations
Calendar the obligations internally and assign an owner for each

The financing structure itself, including how ownership, tax benefits, and obligations are allocated, is covered in Cash, Loan, Lease, or PPA: Which Solar Financing Structure Fits Your Business? The point here is operational: whichever structure you choose, the covenant calendar needs an owner.

Gap 4: Warranty Claims and the Lost-Production Problem

Equipment makers cover the hardware. The EPC covers workmanship for a set period. Neither automatically covers the production lost while a claim is processed.

This matters more than most owners realize at signing, for three reasons. First, standard equipment warranties are generally limited to repair or replacement of the defective product, and they often exclude consequential losses such as lost energy production. In many cases they also exclude or limit the labor of removing and reinstalling equipment, which on a roof can require lifts, cranes, and crews. Second, claims take time: diagnosing the fault, submitting documentation, waiting for approval, and sourcing a replacement can stretch for weeks or months. Third, proving the cause usually requires performance data that the owner does not control.

The result is a system that is “covered” and still losing money. The comparison between a warranty on paper and one that actually makes you whole is discussed in 3 Things Every CEO Should Know Before Signing a Commercial Solar Contract, which addresses manufacturer insolvency and the cost of labor and equipment when a claim arises.

What to do:

Read exactly what each warranty covers, and what it excludes, particularly labor, removal and reinstallation, and consequential loss
Identify who files and manages a claim for each category of equipment, and make that responsibility explicit in the O&M or asset management agreement
Agree in advance how lost production during a claim period will be calculated, and whether any party compensates for it
Make sure that the data needed to support a claim is retained and accessible (see the next gap)

Gap 5: Data Access and Ownership

Almost every gap above depends on data, and data is often where the owner has the least control. Performance data sits on the monitoring vendor’s platform. Maintenance records sit with the O&M provider. Commissioning data sits with the EPC. Production history, alarm logs, and meter readings are the evidence needed for warranty claims, lender reports, performance guarantee disputes, and emissions reporting.

If the platform is proprietary and tied to a vendor relationship that ends, the owner can lose access to years of history. If data export is limited to a dashboard view, the owner cannot give an independent party what they need to verify a claim. If nobody is responsible for data quality, drifting sensors and meter errors can quietly distort every comparison.

What to require:

Contractual ownership of all system data by the owner, regardless of who operates the platform
Export rights in standard formats, available on request and on termination, with the data resolution and retention period specified
A named party responsible for data quality, including sensor and meter calibration
Independent access for third parties, such as an auditor, independent engineer, or insurer, without having to go through the vendor

If the system supports sustainability disclosures, these requirements are even more important, since assurance reviewers need verifiable source data. The specification is covered in Is Your Energy Data Audit-Ready? Why Solar Is the Foundation of 2026 Carbon Reporting.

Gap 6: Tax-Credit Documentation Across Parties

The tax benefits that make many projects work depend on documentation that is created by parties other than the taxpayer. Placed-in-service evidence comes from the EPC and the utility. Equipment qualification and sourcing documentation comes from manufacturers and the EPC. Where prevailing wage and apprenticeship requirements apply, the proof that they were met relies on payroll and apprenticeship records held by the contractors and subcontractors who did the work, while the taxpayer claiming the credit carries the responsibility.

If the credit is transferred to a buyer, the same documentation supports the buyer’s diligence and any recapture insurance. The mechanics are covered in The 2026 Tax Credit Marketplace: A New Way to Fund Your Solar Transition, and the documentation requirements for practitioners are in A CPA’s Guide to Commercial Solar Tax Treatment: What You Need to Know Before Advising Clients in 2026.

The gap is timing. These records are easiest to obtain during construction and hardest to obtain years later, when a subcontractor has dissolved or the project manager has moved on, and an examination or a buyer inquiry may come long after the EPC has left.

What to do: Require in the EPC contract that the documentation package be assembled and delivered at completion, name a party responsible for retaining it, and have your tax advisor confirm what must be collected and for how long. Treat the specifics of what the credit requires as a tax question, not an EPC question.

Gap 7: The Storage and Software Layer

Adding battery storage adds parties, and therefore adds seams. A solar-plus-storage project may involve a battery manufacturer, an inverter or power electronics supplier, an energy management software vendor, and, for projects that earn grid revenue, a virtual power plant aggregator or utility program administrator.

New gaps appear. If an aggregator dispatches the battery more aggressively than the warranty’s throughput or cycle limits allow, who bears the cost of accelerated degradation? If the energy management software changes its dispatch logic in an update, who is responsible for the effect on demand charges? If the battery underperforms, is the cause the cell hardware, the power electronics, the controls, or the dispatch instructions, and who determines which?

These questions are covered from the revenue side in Is Your Roof a Profit Center? The Rise of Virtual Power Plants (VPPs) in 2026, particularly the warranty and cycle-limit checks. The governance principle is the same as for solar: identify every party who can affect the battery’s operation, and make sure someone is accountable for the system’s overall performance, not just each component’s.

Why Nobody Owns the Seams

It is worth saying plainly why these gaps persist, because it affects how you fix them.

Each contract is bounded. A contract describes what one party will do for a price. The prices reflect the narrow scope. A party that is asked to take responsibility for outcomes that depend on other parties’ work will either decline or price in a large risk premium.

Incentives point at the edges. The EPC is paid to build and close out. The monitoring vendor is paid for a subscription. The developer is paid at financial close. None is paid for the 25-year result, and none is penalized if the result is mediocre, as long as their own deliverable was met.

The owner is the only party with an interest in the whole. And the owner is usually the party with the least technical staff dedicated to it. Operations teams are busy running the business, and a solar system that looks fine on a dashboard does not generate urgent calls.

None of this is a reason to distrust the vendors. It is a reason to treat accountability for the whole as a role that has to be deliberately assigned.

Who Should Own the Whole Picture?

The best projects are not the ones with the best individual vendors. They are the ones where someone has clear ownership of the whole picture. There are three common ways to assign that role, each with trade-offs.

Option	How It Works	Strengths	Trade-Offs
Internal owner	A named person or team within your organization, with time, authority, and technical support	Closest to your operations; no added fee	Needs capacity and expertise; competes with other priorities
Owner’s representative or asset manager	An independent party engaged to oversee the project, vendors, and performance	Independent of the vendors; brings specialized expertise; scalable across multiple sites	Added cost; depends on the quality of the engagement and its authority
Single accountable partner	One provider contracted across build and operations, with a single performance commitment	One point of accountability; fewer seams between scopes	Concentrates risk in one party; requires confidence in that party’s financial stability and operating capability

The right choice depends on the size and number of your projects, your internal capacity, and your risk preferences. A portfolio of sites often justifies an independent asset manager. A single mid-size system may be well served by a single accountable partner with a clear performance commitment and an internal point person who reviews reports. What does not work is leaving the role unassigned.

Whichever you choose, the role needs three things: a written mandate, authority to direct the vendors or escalate to someone who can, and access to all the relevant data.

The Pre-Signing Gap Audit

Before you sign any solar contract, map the full life of the project and ask who owns each handoff. If the answer to any of the following is “it depends” or “the other vendor,” you have found a gap.

First-year performance: Who is responsible for the gap between actual and modeled production, and what is the agreed baseline and measurement method?
After the guarantee ends: Which contract covers energy output, not just equipment availability, in year three and beyond?
Alerts: Who monitors them, how fast must they respond, and who has authority to dispatch repairs without waiting for approval?
Closure: Who verifies that production recovered after a repair?
Lender and investor obligations: Who supplies the data and actions behind each covenant and report, and by when?
Warranty claims: Who files and manages them, and who bears the cost of lost production and of labor while a claim is processed?
Data: Do we own it, can we export it, and who is responsible for its quality?
Tax documentation: Who assembles, delivers, and retains the records that support the credit?
Storage and software: Who is accountable when the battery, the controls, and the dispatch instructions interact?
The whole picture: Who is the named party responsible for all of the above, and what is their authority?

Ask these questions in writing and get written answers. How a vendor responds to them is itself informative, as discussed in What a Good Solar Sales Process Looks Like — and Why It Tells You More Than the Proposal. A vendor who engages with the question and proposes a way to close the gap is behaving like a partner. A vendor who treats the question as out of scope is telling you where the gap will be.

Frequently Asked Questions

Isn’t this what the EPC’s O&M contract is supposed to cover? Sometimes, partially. O&M contracts vary widely. Some cover only scheduled maintenance and respond to calls; others include active monitoring, defined response times, and repair authority. Many guarantee equipment availability rather than energy output. Read the O&M scope against the gap audit above and note which items it covers and which it leaves open.

We have a monitoring subscription. Doesn’t that mean someone is watching the system? Not necessarily. Many monitoring subscriptions provide the platform and send alerts, but do not include someone who investigates them and dispatches repairs. Ask specifically who receives the alerts, what they are obligated to do, and within what time frame.

Should we require a production guarantee from the EPC? A production guarantee is a valuable protection, provided the baseline, measurement method, term, and remedy are clearly defined and the remedy compensates you meaningfully for the shortfall. A guarantee that is vague on any of those points offers less protection than it appears. Also consider what covers performance after the guarantee period ends.

Is a single accountable partner always better than multiple specialists? Not always. It reduces seams but concentrates risk in one party, so their financial stability, operating depth, and track record matter more. Multiple specialists can be strong in their areas but require someone to coordinate them. The decision depends on your capacity to manage the relationships and your tolerance for concentration risk.

What if the system is already installed and we did not map these gaps? It is not too late. Start by reading your existing contracts against the audit list, identify which items have no named owner, and assign them. Many gaps can be closed through an amendment to the O&M or monitoring agreement, an internal assignment of responsibility, or engaging an asset manager. Start with alerts and data access, since those affect production and evidence right away.

Solar systems rarely disappoint because a vendor failed at its job. They disappoint because a handoff had no owner. The owners who get the performance they were promised are the ones who identified the seams before signing, put a name next to each one, and made sure someone was responsible for the whole.

Power Solar can walk through the handoffs on a proposal or contract you are evaluating and help you identify which responsibilities are named and which are open. Contact us to review the gaps before you sign.