To evaluate a proposed data center, first define what is being built and what would happen without it; then request project-specific utility, environmental, fiscal, and emergency-response evidence. Compare benefits and burdens over time, identify who receives each benefit and pays each cost, and check the federal, state, and local rules that actually apply. Without the site, design, utility analyses, and permit record, no reliable conclusion about a particular project’s impacts is possible.
Start with a clear description of the proposal
A data center is not just a building. Its local effects may depend on the number and timing of construction phases, the facility’s operating profile, its power supply and backup systems, water and sewer connections, and any supporting infrastructure. Establish the scope before assessing claims about jobs, utility capacity, or environmental effects.
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Request a project description that identifies:
- Each parcel, building, phase, construction start and completion date, and expected operating schedule.
- Peak and annual electricity demand by phase, the proposed supply, and any new generation, substations, transmission lines, storage, or interconnection work.
- Cooling design, expected water use by month and season, water source, wastewater volume and destination, and any planned utility extensions or treatment upgrades.
- Backup generators, on-site power plants, fuel storage, battery energy storage systems, and uninterruptible power installations.
- Construction activity, traffic routes, stormwater work, lighting, and other proposed roads, pipelines, or utility projects.
Distinguish the developer’s assumptions and promises from independent analysis and government findings. A commitment is not a guaranteed benefit unless its terms, funding, responsible party, duration, and enforcement mechanism are clear.
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Compare the proposal with a documented no-build case: the likely condition of the site and local services if the project does not proceed. Where the approval process offers reasonable alternatives, such as a different site, layout, or design, compare those on the same basis. EPA’s Guidelines for Preparing Economic Analyses, 3rd edition, emphasizes a defined baseline, uncertainty, timing, and the distribution of costs and benefits. The U.S. Department of Energy’s environmental assessment guidance describes consideration of alternatives as required.
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Map the area of analysis around actual connections and effects, not just a boundary around the building. Include nearby residents and sensitive uses, utility service areas, roads and bridges, water and sewer systems, and emergency-response districts. Also identify communities that could be affected by associated power or water infrastructure. Consider direct effects and reasonably foreseeable indirect effects, which environmental assessment materials may include land-use changes and related effects on natural systems.
Include existing and reasonably foreseeable projects and infrastructure changes in the baseline. Separate short-term construction effects from long-term operating effects, and identify assumptions or unknowns that could change the result. For each proposed mitigation measure, ask what monitoring will verify it and what condition would trigger corrective action.
Request evidence by impact area
Use the same core questions for the developer, utility, local departments, and regulators, but ask each party for the analysis within its responsibility. A developer’s forecast is not a substitute for a utility capacity study or a government permit finding.
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| Impact area | Evidence and questions to request | What the review should establish |
|---|---|---|
| Land use and siting | Planning and zoning consistency; land to be converted; site alternatives; grading, stormwater, lighting, visual effects, construction traffic, and noise; related lines, substations, pipelines, roads, and water projects. | Whether the project fits adopted plans and nearby uses, what changes are required, and whether a lower-conflict or previously developed site is a reasonable alternative. |
| Electricity, grid, and rates | Peak and annual demand by phase; assumptions behind forecasts; generation, transmission, substation, storage, and interconnection needs; allocation of costs among the developer, utility, other customers, and taxpayers; project-specific reliability or rate analysis. | How the facility will be served, what upgrades are needed, who pays, and whether the utility or regulator identifies effects on system planning, reliability, or bills. |
| Water, sewer, and wastewater | Monthly and seasonal withdrawals or purchases, peak and drought assumptions, source, competing users, provider capacity analysis, cooling and reuse assumptions, wastewater volume, temperature, chemistry, discharge destination, and needed treatment or connection upgrades. | Whether water and sewer systems can serve the project under relevant seasonal conditions, what upgrades are needed, and who funds them. |
| Air, noise, and traffic | Construction and operating noise, including at night; measurement locations and assumptions; generator and on-site plant emissions; testing and emergency run schedules; construction and worker trips, equipment routes, and road or bridge needs. | Expected conditions at nearby sensitive uses and what mitigation, monitoring, road work, or operating limits are proposed. |
| Emergency response | Site plans and hazards for generators, stored fuel, batteries, and electrical systems; fire department equipment and training; access, communications, water supply, and expected response demands. | Whether responders have the capacity and information needed, what upgrades or training are required, and who pays. |
| Economics and public services | Construction and permanent job counts, skills, wages and benefits, local hiring and training; taxes and fees; incentives; public costs for roads, utilities, water and sewer, emergency response, and ongoing services. | Net fiscal effects against the no-build baseline, timing of revenues and costs, and how benefits and burdens are distributed. |
New Jersey Economic Development Authority guidance recommends examining master-plan conformance, community engagement, utilities, infrastructure, water supply, roads and bridges, communications, and fire readiness. Pennsylvania’s data-center toolkit addresses infrastructure, fiscal effects, zoning, legal issues, and community priorities. These are useful review lenses, not rules that automatically apply outside their jurisdictions.
Check the main local questions with project-specific evidence
How much electricity will it use, and could it affect bills or reliability?
Ask for peak and annual forecasts for each phase and the assumptions behind them, then seek the serving utility’s analysis of capacity, required upgrades, interconnection timing, and cost allocation. Ask the utility or regulator—not only the developer—whether the proposal changes system planning, reliability, or rates. For on-site generation, establish how it will operate, what emissions and fuel storage are involved, and whether it is grid-connected or islanded. Record whether energy-supply or affordability promises are binding, conditional, or time-limited.
Pennsylvania’s GRID requirements address energy affordability, energy sourcing, and local approvals in that state. EPA’s July 27, 2026 guidance concerns Acid Rain Program applicability to islanded generation and notes that a future grid connection may change the analysis. That specific federal interpretation does not establish that all permits are unnecessary; other federal, state, and local requirements may still apply.
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How much water will it use, and what happens to wastewater?
Request expected use by month and season, including peak conditions and drought assumptions, and identify the source and other users who depend on it. Ask the water and sewer providers for capacity analyses and the costs, schedule, and funding plan for any extensions or treatment upgrades. Have the project specify cooling and water-reuse assumptions, wastewater volume and characteristics, and where discharge will go. There is no universal water-use threshold in the cited municipal guidance that determines impact for every data center; the site, season, watershed, and design matter.
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What will it sound like, and what air and traffic effects are expected?
Request construction and routine-operation noise forecasts, including nighttime conditions, and ask where and how levels were modeled or measured. Identify homes, schools, care settings, and other sensitive uses in relation to the proposed measurement locations. For air emissions, ask which generators or power systems will operate, their expected testing and emergency schedules, and what permits or controls are proposed. For traffic, request trip forecasts by construction and operating phase, heavy-equipment routes, and any road, bridge, or safety improvements. The applicable review should state assumptions and mitigation; without a project location and design, a site-specific noise, air, traffic, or health conclusion cannot be drawn.
How many permanent local jobs are likely?
Separate temporary construction work from permanent facility positions. Ask for projected job counts by phase, job categories, skills, wages and benefits, local hiring plans, and funded training commitments. Treat projected hiring as an estimate unless an enforceable commitment specifies terms and accountability. Massachusetts Executive Order 658 includes state agency expectations concerning workforce and local hiring for projects with proposed peak electricity demand exceeding 25 megawatts. That threshold and policy are specific to the order and Massachusetts; they are not a general estimate of jobs or a nationwide requirement.
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Calculate public costs and benefits over time
Do not treat private investment or gross tax revenue as a complete measure of community benefit. Compare expected revenues with incentives and public-service costs, using the same baseline and time horizon. Separate one-time construction activity from recurring operations and distinguish when costs occur from when revenues are received.
- Public revenue: estimate taxes and fees, then disclose abatements, grants, credits, or other incentives and calculate net revenue against the no-build case.
- Public spending and services: identify who funds roads, utility extensions, water and sewer upgrades, emergency response, and ongoing services, including any future maintenance obligations.
- Employment: show construction and permanent work separately, with skill and wage assumptions, local hiring terms, and training provisions.
- Distribution: state which communities receive revenues or jobs and who may bear infrastructure costs, utility charges, service demands, or nearby effects.
EPA’s economic-analysis guidance treats uncertainty, timing, and distribution as core considerations. Pennsylvania’s toolkit also addresses fiscal impacts and economic development planning. A decision-maker should be able to see both the totals and who bears or receives each part.
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Identify which permits and public reviews apply
There is no single approval pathway for every data-center proposal. Begin with the actual location, project components, funding, and infrastructure, then identify applicable local permits and state requirements. A federal environmental review is not automatically required for every privately funded facility.
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| Review level | What to determine | Important limit |
|---|---|---|
| Federal | Whether there is a major federal action that triggers review under the National Environmental Policy Act (NEPA). If so, determine the appropriate process and agencies involved. | NEPA is not a blanket local approval process for every private development. EPA describes categorical exclusions, environmental assessments (EAs), and environmental impact statements (EISs); an EA considers purpose and need, alternatives, impacts, and consultation, and significant impacts can lead to an EIS. DOE describes EAs as public documents supporting either a finding of no significant impact or a determination that an EIS is needed. |
| State | Check state laws, agency permits, and any state-specific energy, water, air, or development requirements. | Requirements vary. Pennsylvania’s GRID framework and Massachusetts Executive Order 658 are examples of distinct state approaches, not national standards. |
| Local | Check zoning, site-plan, building, water, sewer, fire, air, stormwater, and other permits, plus hearing and notice requirements. | The responsible authorities and review procedures depend on the jurisdiction and the project’s components. |
Ask the relevant agencies for the permit list, application status, hearing calendar, public-comment process, and documents they will use to make findings. Massachusetts Executive Order 658 also includes a reporting deadline beginning September 2027; that date belongs to its state framework and should not be applied elsewhere.
Compare proposals consistently and make commitments enforceable
If there are multiple real proposals or designs, score each against the same evidence categories and time horizon. Do not rank hypothetical alternatives without comparable project data. A useful comparison records the evidence quality beside each finding—for example, applicant forecast, utility analysis, agency finding, or unresolved assumption.
| Comparison axis | Record for each proposal or design |
|---|---|
| Site and land-use fit | Plan consistency, land conversion, nearby uses, and alternatives. |
| Electricity and grid | Demand forecast, supply plan, upgrades, cost allocation, and ratepayer or reliability analysis. |
| Water and wastewater | Source, seasonal demand, provider capacity, discharge, upgrades, and funding. |
| Construction and operation | Noise, emissions, traffic, sensitive uses, operating schedules, and mitigation. |
| Public services and fiscal effects | Infrastructure and emergency-response needs, incentives, net revenue over time, and job commitments. |
| Enforcement and uncertainty | Binding terms, responsible parties, monitoring, corrective-action triggers, cumulative effects, and unresolved assumptions. |
For every promised benefit or mitigation measure, identify the document that makes it binding, who must comply, who verifies compliance, and what remedy applies if the condition is missed. This turns broad assurances into terms residents and officials can check.
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Quick Recap
Use a practical review sequence
- Assemble the project record. Obtain the site and phase plans, operating assumptions, utility forecasts, infrastructure plans, permit applications, proposed mitigation, and draft commitments.
- Write down the baseline and alternatives. Document the no-build condition and any reasonable sites or designs in the approval process; state the time horizon for each comparison.
- Map affected people and systems. Include residents and sensitive uses, utility and water service areas, transport links, emergency districts, and communities touched by associated infrastructure.
- Send targeted evidence requests. Ask the utility, water and sewer providers, planning and public works departments, fire services, and relevant regulators for capacity findings, cost allocations, permit requirements, and service impacts.
- Compare burdens, benefits, and timing. Separate construction from operations, gross revenue from net public revenue, and private spending from costs assigned to public agencies, customers, or taxpayers.
- Verify conditions and remaining uncertainty. Track each commitment to its enforceable document, responsible party, monitoring method, and corrective action. State which missing information could alter the assessment.
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