What Hotel Managers Should Measure Before Claiming to Be Sustainable

Hotel building with overlaid icons representing energy, water, and waste monitoring

By Dr. Juliana Philip Ndalnamu

> Hotel Sustainability Measurement Series

This article is part of an ongoing series exploring evidence-based sustainability in the hospitality industry. Each article builds on the previous one to provide hotel managers, researchers, students, and policymakers with practical insights into measuring and improving environmental performance.

  Introduction

A general manager once told me, with genuine pride, that her hotel was "fully committed to sustainability." When I asked what that meant in practice, she pointed to the towel reuse cards in every bathroom and the recycling bins near the lobby lift. When I asked how much electricity the property consumed per occupied room, or how many litres of diesel its generator burned each month, she paused. She didn't know. No one in the building did.

This scenario is not unusual. This is, in fact, close to the industry norm. Hotels around the world have become fluent in the language of sustainability - green logos, eco-friendly slogans, linen reuse programs - while remaining largely silent on the numbers that would reveal their environmental performance.

Sustainability, properly understood, is not a communications exercise. It is a measurement discipline. A hotel cannot credibly claim to be sustainable if it does not know how much energy it consumes, how much water it uses, how much waste it generates, or where its emissions originate. Claims without data are, at best, aspirations. At worst, they are greenwashing.

This principle has been reinforced through my ongoing TETFund National Research Fund (NRF) research on real-time estimation of hospitality carbon footprints in Nigerian hotels. One of the clearest lessons emerging from this work is that meaningful sustainability decisions depend on reliable environmental data. Hotels cannot improve what they do not measure. Environmental stewardship begins not with promotional campaigns but with understanding the true environmental footprint of daily operations.

This article sets out, in practical and academically grounded terms, what hotel managers should measure before making any sustainability claim and why that measurement is the true foundation of credible hotel sustainability.

Why Sustainability Requires Measurement

There is an important distinction between an environmental claim and environmental performance. A claim is a statement; "We are an eco-friendly hotel." Performance is a fact, expressed in numbers: kilowatt-hours consumed per room-night, litres of water used per guest, tonnes of CO2 emitted per year.

Claims are easy to make and difficult to verify. Performance data is harder to produce but far more valuable because it can be checked, benchmarked, and improved over time.

This distinction matters because decision-making without data tends to default to guesswork. A manager who "feels" that the hotel's energy use is reasonable has no way of confirming it, no way of identifying where waste is occurring, and no way of demonstrating improvement to investors, guests, or regulators. Measurable indicators replace intuition with evidence, allowing managers to identify inefficiencies precisely rather than assume they don't exist.

This is where a long-standing management principle becomes directly relevant to hospitality operations: managing something you have not measured is, at best, managing by assumption. You cannot know whether your energy use has decreased by 10% this year if you never established what it was last year. You can’t know whether your new water-saving fixtures are working if you have no baseline against which to compare consumption.

Measurement, in other words, is not a bureaucratic add-on to sustainability. It is the mechanism through which sustainability becomes real and improvable.

The Most Important Sustainability Indicators Every Hotel Should Measure

The remainder of this article works through the environmental indicators that matter most in hotel operations, what they mean, how they are measured, and why each one contributes to long-term environmental performance and competitiveness.

A Practical Illustration

Consider two hotels.

Hotel A proudly advertises towel reuse programme, replaces plastic straws with paper alternatives, and promotes itself as an environmentally responsible property.

Hotel B also encourages towel reuse, but in addition measures monthly electricity consumption, diesel generator fuel use, water intensity, waste generation, and greenhouse gas emissions.

Although both hotels may appear equally committed to sustainability from a guest's perspective, only Hotel B possesses the environmental data necessary to evaluate whether its initiatives are reducing environmental impacts.

This distinction highlights the difference between sustainability communication and sustainability management. The first influences perception; the second improves performance.

| Indicator | Example KPI | Why It Matters |

|-----------|-------------|----------------|

| Carbon Footprint | kg CO₂e per guest-night | Measures greenhouse gas emissions |

| Energy Consumption | kWh per occupied room | Identifies energy inefficiencies |

| Water Consumption | Litres per guest-night | Supports water conservation |

| Waste Generation | kg waste per guest-night | Tracks waste reduction performance |

| Renewable Energy | % renewable energy used | Measures to transition to clean energy |

| Indoor Air Quality | Air Quality Index | Improves guest wellbeing |

 1. Carbon Footprint

A hotel's carbon footprint is the total volume of greenhouse gases generated, directly and indirectly, by its operations. Under internationally recognised greenhouse gas accounting frameworks, these emissions are typically divided into three categories.

Scope 1 emissions are direct emissions from sources the hotel owns or controls, diesel generators, boilers, and company vehicles, for example. These are usually the easiest emissions to measure, since they can be calculated from fuel consumption records.

Scope 2 emissions are indirect emissions associated with purchased electricity. Even though the hotel does not burn fuel itself to produce this power, the emissions generated at the power station to supply that electricity are attributed to the hotel.

Scope 3 emissions are the most complex and often the largest category. They include emissions from the broader value chain: supplier transportation, food production, guest travel to and from the property, laundry outsourced to third parties, and waste sent to landfill.

Emerging hotel carbon footprint estimation frameworks increasingly allow managers to monitor emissions in near real time rather than relying solely on annual sustainability reports. Such approaches enable more proactive decision-making by identifying operational hotspots as they occur instead of after environmental impacts have accumulated.

Carbon footprint estimation matters because it is the only indicator that aggregates a hotel's entire environmental impact into a single, comparable figure. It allows a property to set a baseline, track progress toward emissions reduction targets, and communicate credibly with investors and guests who increasingly expect disclosure under ESG-aligned reporting expectations.

Diagram showing Scope 1, Scope 2, and Scope 3 greenhouse gas emissions in hotel operations

2. Energy Consumption

Energy is typically the single largest controllable cost - and environmental impact - in hotel operations. Comprehensive energy measurement should extend across several distinct systems.

Electricity consumption should be monitored at the property level and, where possible, broken down by department, since kitchens, laundry, and guest floors have very different consumption profiles.

Diesel generators, especially in regions with unreliable grid supply, deserve close attention. Tracking generator running hours and fuel consumption reveals both costs and emissions that rarely appear in public sustainability reporting, despite often being substantial.

HVAC systems (heating, ventilation, and air conditioning) are frequently the largest single energy draw in hotels located in hot or humid climates. Poorly maintained systems, incorrect temperature settings, and oversized equipment can waste enormous amounts of electricity.

Kitchen equipment, including ovens, refrigeration, and dishwashing systems, often runs continuously and is worth metering separately given its intensity of use.

Lighting, while individually a smaller draw, is easy to improve through LED retrofits and occupancy sensors, and worth tracking as a discrete category.

The most useful summary metric across all of these systems is energy use per occupied space, a figure that allows meaningful comparisons across time periods, seasons, and even between similar properties.

 3. Water Consumption

Water scarcity is an increasingly pressing concern in many tourism destinations, making water measurement a matter of both environmental and community responsibility.

Monitoring should ideally be disaggregated across the main consumption points: guest rooms (showers, taps, toilets), laundry operations (among the most water-intensive back-of-house activities), kitchen use (food preparation and dishwashing), swimming pools (filling and evaporation losses), and gardens (irrigation, which can be substantial in landscaped resort properties).

The standard comparative metric here is water use per guest-night, which allows a hotel to track efficiency gains over time and benchmark itself against sector averages, particularly relevant frameworks published by bodies such as the Global Sustainable Tourism Council (GSTC).

4. Waste Generation

Waste measurement in hotels is often underdeveloped relative to its environmental significance.

Food waste from over-preparation, buffet spoilage, and plate waste carries a double cost: the resources used to produce food that is never eaten, and the greenhouse gases released when it decomposes in landfill. Plastic waste, from single-use amenities and packaging, remains a visible and reputationally significant category. Solid waste more broadly should be tracked by volume or weight wherever possible.

Beyond generation, hotels should measure waste diversion as the proportion of waste redirected away from landfill through recycling and composting programmes. A hotel that tracks not just how much waste it produces, but how much it successfully diverts, demonstrates a far more sophisticated approach to environmental management than one relying solely on the presence of recycling bins.

5. Sustainable Procurement

What a hotel buys is as environmentally significant as what it consumes on-site. Local sourcing reduces transportation-related emissions and supports regional economies. Eco-certified suppliers for food, linens, cleaning products, and amenities provide a degree of third-party verification that self-declared sustainability cannot.

Responsible purchasing policies, covering everything from seafood sourcing to chemical use, allow hotels to extend their environmental standards beyond their own walls. Taken together, these practices constitute **supply chain sustainability, an area of growing relevance to Scope 3 emissions accounting and one still largely unmeasured across the industry.

6. Indoor Environmental Quality

Sustainability is not only about external environmental impact, it also concerns the quality of the internal environment experienced by guests and staff.

Air quality and ventilation affect both health outcomes and energy efficiency, since poorly ventilated spaces often require more aggressive (and energy-intensive) air conditioning to feel comfortable. Thermal comfort and lighting quality directly influence guest satisfaction, while noise management affects both guest experience and, in some cases, staff wellbeing.

Measuring occupant well-being through guest feedback, staff surveys, or environmental sensors connects sustainability to the lived experience of the building, reinforcing the point that environmental performance and human experience are not separate concerns.

7. Renewable Energy Adoption

The proportion of a hotel's energy sourced from renewable generation is an increasingly important indicator, particularly as properties pursue Net Zero commitments.

Solar installations, whether for water heating or electricity generation, are the most common renewable investments in hospitality. Battery systems allow hotels to store renewable energy for use during peak demand or grid outages, reducing reliance on diesel generators. Green electricity purchased from certified renewable suppliers, where available, offers another pathway.

Tracking energy transition - the percentage of total energy needs met by renewable sources year over year gives hotels a concrete, verifiable metric to include in sustainability disclosures, rather than a vague claim of "green energy use."

8. Guest Engagement

Guest behavior is a genuine, if often overstated, contributor to a hotel's environmental footprint. The challenge is that most guest engagement initiatives towel reuse being the most obvious example measure participation, not impact.

A more rigorous approach tracks behavioral changes connected to measurable outcomes: how much water or energy is saved when guests opt out of daily housekeeping, for instance, or how food waste changes when guests are given smaller default portions with the option to request more.

Guest engagement, done well, moves beyond symbolic participation toward measurable behavioral contributions and should be evaluated with the same rigour applied to operational systems, not treated as a substitute for measuring them.

Hotel guest engagement card next to a chart showing measured energy savings

 Why Data Matters More Than Green Marketing

The gap between environmental communication and environmental performance is where greenwashing occurs, not always through deliberate deception, but often through the simple absence of verification.

A hotel that advertises sustainability without underlying data is making a claim that cannot be checked. A hotel that reports its actual carbon footprint, water intensity, and waste diversion rate - even if those figures are imperfect  - is offering something verifiable.

This distinction increasingly matters to sophisticated stakeholders. Investors conducting ESG due diligence are trained to distinguish disclosed performance data from marketing language. Corporate travel buyers, particularly in Europe, are beginning to request environmental data as a condition of contracts. Guests, especially younger travelers, are growing more literate in identifying vague sustainability claims.

Transparent reporting, even when the numbers are not yet impressive, builds more long-term trust than polished but unverifiable claims. A hotel that says "our water use per guest-night decreased by 8% this year, and here's how we did it" is making a far more credible statement than one that simply describes itself as "eco-conscious."

 How Environmental Indicators Improve Hotel Performance

Measurement is not merely a compliance exercise; it delivers tangible operational and strategic benefits.

Lower operating costs frequently follow directly from energy and water monitoring, since inefficiencies that would go unnoticed without data a malfunctioning chiller, an oversized generator, a leaking pipe can be corrected once identified.

Better ESG reporting becomes possible only when the underlying data exists, positioning hotels favourably as institutional investors increasingly incorporate sustainability criteria into capital allocation decisions.

Improved investor confidence follows from demonstrable, auditable environmental performance rather than promotional claims, particularly relevant for hotel groups seeking financing or acquisition interest.

Competitive advantage accrues to properties that can substantiate their sustainability credentials with data, particularly in markets where corporate and group bookings increasingly require environmental disclosure.

Guest trust is strengthened when sustainability claims are backed by specific, verifiable figures rather than generic assurances.

Regulatory compliance is becoming more relevant as more jurisdictions introduce mandatory sustainability reporting for larger hospitality operators, making early measurement capability a practical safeguard rather than a future burden.

Climate resilience the capacity to anticipate and adapt to climate-related operational risks such as water scarcity, extreme heat, or energy price volatility depends fundamentally on understanding current consumption patterns as a starting point for adaptation planning.

Challenges Hotels Face

None of this is to suggest that measurement is simple. Hotels, particularly smaller, independently owned properties, face genuine obstacles.

The cost of measurement metering equipment, monitoring software, and staff time can seem significant relative to immediate returns, particularly for properties operating on thin margins.

A lack of expertise is common; many hotel teams have strong operational and hospitality skills but limited training in environmental data collection or interpretation.

Limited technology infrastructure, especially in older properties, can make granular submetering difficult without capital investment.

In developing countries, where grid reliability is poor and diesel generator dependence is high, the practical and financial barriers to comprehensive measurement are often greater, even as the underlying environmental impacts may be more severe.

Data availability more broadly remains inconsistent: utility bills often provide only aggregate figures, offering little insight into which departments or systems are driving consumption.

Finally, managerial commitment cannot be assumed. Measurement systems require sustained attention, and initiatives frequently stall once the initial installation phase passes without leadership reinforcement.

Practical solutions exist for each of these challenges. Hotels can begin with low-cost measures utility bill analysis, manual generator log sheets, simple water meters on major systems before investing in more sophisticated submetering. Partnerships with universities and sustainability consultancies can supplement in-house expertise. Regional hotel associations and tourism boards can support smaller properties through shared training programmes and, in some cases, subsidised technology access.

The Future of Hotel Sustainability

Emerging technologies are steadily lowering the barriers to sustainability measurement.

IoT (Internet of Things) sensors now allow real-time monitoring of electricity, water, and even air quality at a fraction of the cost of a decade ago. Smart meters provide granular, time-stamped consumption data that can reveal patterns invisible in monthly utility bills.

AI-based analytics are increasingly being used to detect anomalies - a sudden spike in water use suggesting a leak, for instance - far faster than manual review would allow. Carbon accounting software platforms are simplifying what was once a specialist consulting exercise, making Scope 1 and Scope 2 calculations accessible to properties without dedicated sustainability staff.

Digital twins, virtual models of a hotel's physical systems, are beginning to allow simulation of energy and water interventions before capital is committed, reducing the risk of costly retrofits that underperform expectations.

Real-time monitoring dashboards, once the preserve of large international chains, are becoming affordable enough for independent and mid-scale properties. Combined with predictive analytics, these tools point toward a future in which hotels do not simply report past performance, but anticipate and prevent inefficiencies before they occur.

Looking ahead, the integration of artificial intelligence, Internet of Things (IoT) technologies, smart sensors, and real-time environmental monitoring platforms has the potential to transform hotel sustainability management. Instead of relying on retrospective reports, hotel managers will increasingly be able to monitor environmental performance continuously and respond quickly to emerging inefficiencies.

Real-time hotel sustainability dashboard showing energy, water, and carbon metrics

 Practical Recommendations

For hotel managers: Begin with a baseline environmental audit before making any public sustainability claims. Prioritize metering the highest-impact systems first electricity, generators, and water  rather than attempting comprehensive measurement immediately.

For researchers: Pursue longitudinal studies that track hotel environmental performance over time, rather than relying solely on cross-sectional surveys of stated intentions or perceptions.

For policymakers: Develop clear, proportionate reporting standards for hotel energy, water, and carbon data, with graduated requirements that account for the resource constraints of smaller and independently owned properties.

For hospitality educators: Integrate environmental data literacy into hospitality management curricula, ensuring graduates understand not only guest service excellence but also the basic principles of energy, water, and carbon measurement.

For students: Seek out research and internship opportunities specifically focused on hotel environmental performance data, an area still under-explored relative to its growing industry importance, and rich with opportunity for original contribution.

Conclusion

The question hotels most urgently need to stop asking is, "How can we appear sustainable?" The question that should replace it is, "How can we measure and continuously improve our environmental performance?"

This shift, from claims to accountability, is not simply a matter of academic preference. It reflects where the industry is heading, driven by investor scrutiny, regulatory change, and a guest base growing more literate in distinguishing genuine performance from polished language.

The future of sustainable hospitality will not be determined by which hotel claims to be the greenest. The award will be determined by which hotel can measure, verify, and continuously improve its environmental performance.

Occupancy rates, RevPAR, and guest satisfaction scores have long shaped hotel decision-making. Environmental performance indicators must now become equally important. Carbon emissions, energy efficiency, water intensity, waste generation, and resource productivity are no longer peripheral concerns; they are becoming core business metrics.

Sustainability is therefore no longer simply a marketing strategy. It is a measurable management discipline. The hotels that will lead the next generation of responsible tourism will be those that replace environmental promises with environmental evidence and transform data into continuous improvement.

Join the Conversation

What does your hotel or research currently measure and what gaps remain? I invite hotel managers, researchers, and sustainability practitioners to share their experiences in the comments below. Let's build a more evidence-based conversation about what genuine hospitality sustainability requires.

 Call to Action

If this article resonated with your work as a manager, researcher, or policymaker, I'd love to hear from you. Comment below with the sustainability indicators your hotel or institution currently tracks, share this article with colleagues navigating similar questions, and let's continue building a more measurable, evidence-based approach to hospitality sustainability together.

Share your thoughts in the comments section below and join the conversation.

🔗 In Case You Missed It

This article is the second in my Hotel Sustainability Measurement Series.

If you haven't already, I encourage you to read the first article:

👉 Going Green Is Not Enough: Why Many Hotels Still Fail at Sustainability

In this article, I explain why sustainability is more than towel reuse programs, recycling initiatives, or environmental marketing. I argue that genuine sustainability begins with measurement, not claims, a foundation upon which this article builds.

 ⏭️ Coming Next

Understanding Hotel Carbon Footprints: A Beginner's Guide

In the next article, we'll explore:

- What a hotel's carbon footprint really is.

- Identify the major sources of greenhouse gas emissions in hotel operations.

- How carbon footprints are measured.

- Why carbon accounting is becoming an essential management tool for modern hotels.

- Practical insights for researchers, hotel managers, and sustainability professionals.

Hotel Sustainability Measurement Series

✅ Part 1: Going Green Is Not Enough: Why Many Hotels Still Fail at Sustainability *(Published)

✅ Part 2: What Hotel Managers Should Measure Before Claiming to Be Sustainable *(Current Article)

🔜 Part 3: Understanding Hotel Carbon Footprints: A Beginner's Guide

🔜 Part 4: Scope 1, Scope 2, and Scope 3 Emissions Explained for Hotels

🔜 Part 5: Five Common Sustainability Mistakes Hotel Managers Make

🔜 Part 6: How ESG Is Transforming the Hospitality Industry

Stay connected as we continue this journey towards building a more measurable, evidence-based approach to sustainable hospitality.