Mayfair, London ยท Independent financial modelling
Energy and infrastructure financial models you can trust, understand and run yourself.
Built by ex-investment bankers. Delivered within three weeks. No consulting overhead, just better models.
3 weeks
Guaranteed delivery of a Quantessa-stamped financial model
2 models
Maximum per analyst, so your model gets full attention
100%
Modellers are ex-investment bankers, rigorously tested
Handbook + training
Included free with every model
Singular focus on delivering the highestโquality, tailored energy and infrastructure financial models. Thatโs it!
About us
Big Firm Standards, Independent Service
Found in the heart of Mayfair, London, Quantessa is an independent boutique financial modelling specialist dedicated to building the most efficient, intuitive financial models on the street. We deliver institutional-quality work with best-practice formatting, ongoing support, and clear communication without the overhead of major consultancies.
Elite Team, Proven Excellence
Our modellers are exclusively ex-investment bankers from leading global institutions, rigorously selected through comprehensive testing. Each receives additional training in our signature methodologies, ensuring consistent, superior quality across all deliverables.
Founded on Market-Leading Expertise
Quantessa was founded by former bankers from global investment banks who are specialising in energy and infrastructure financial modelling on corporate and project levels. Quantessa developed distinctive modelling practices and structures that earned widespread client recognition. These proven principles form the foundation of our fastest, most precise, and intuitive financial models whilst training the next generation of elite modellers.
Our Commitment: Specialist Financial Modelling Excellence
We are a hyper-specialist provider of bespoke models that our clients can trust, understand and operate themselves. We do not get distracted by consulting or advisory services. This specialisation allows us to deliver models that are superior in quality, efficiency, and speed, offering better models than banks or large consultancies whilst maintaining the highest standards of integrity and client service.
Big-firm standards, independednt service
Hyper-Specialised
Talent developed to build bespoke models efficiently and accurately, with no advisory distractions
Truly independent
A natural choice for independent model audit or a fresh financial model build
Quantessa Models in 3 Weeks
Guarantee of delivering a Quantessa-stamped financial model within the 3rd week of the engagement start
Short Command Chain
Maximum of two models per analyst optimizing staffing and maximizing speed, accuracy and price
Services
Two core services today, with ready-made templates on the way.
Bespoke Financial Modelling
Make better-informed financial decisions with bespoke models built around your business, transactions and investment objectives. From equity and debt capital raising, project finance and M&A to LBO analysis, cap-table modelling, asset and portfolio modelling, FP&A, infrastructure and real estate, Quantessa develops tailored models to support complex financial analysis and decision-making.
Every model includes a complimentary model handbook and dedicated training, helping your team navigate, understand and use the model with confidence.
Model Audit and Review Services
Build confidence in your financial models with a structured review designed to identify errors, inconsistencies and inefficiencies. Quantessa assesses both model mechanics, including formulas, structure, links, circularities and key calculations, and inputs and commercial assumptions, examining whether model logic and outputs align with commercial proposals, transaction documents, contracts, financing terms and operating assumptions.
Our services include model-mechanics certification or a clearly structured red-flag report, review of industry benchmark packs and key operating assumptions. Legal, accounting, technical and wider commercial due diligence can also be provided via Quantessaโs partners.
Coming soon
Model Templates
Save time and bring greater consistency to your financial analysis with professionally structured, customisable model templates designed for real-world applications. Quantessaโs templates prioritise transparency, flexibility and ease of use, helping you evaluate projects, analyse investments, assess financing options, prepare budgets and forecasts, and run scenarios to support decision-making.
Each template provides a practical starting point that can be adapted to your requirements.
Leadership
Alberto Terziฤ
Founder & Principal | Energy & Infrastructure
Alberto is the Founder of Quantessa, with over five years of experience across investment banking, private equity and consulting. His expertise spans financial modelling, valuation and transaction analysis, particularly across renewable energy, infrastructure and clean technology.
Prior to founding Quantessa, Alberto worked at Marathon Capital, where he gained experience advising on equity capital raisings and mergers and acquisitions across the renewable energy, digital infrastructure and clean technology sectors in Europe and the United States. His transaction experience includes the sale of the remaining 50% stake in Island Green Power to Macquarie and an equity capital raising for SSE-backed Renewco Power.
Before Marathon Capital, Alberto worked at AMPYR, where he contributed to the financial analysis supporting a โฌ200 million project financing facility secured for the construction of utility-scale solar parks in the Netherlands.
At Quantessa, Alberto applies his transaction experience and technical expertise to developing bespoke financial models, conducting model reviews and delivering financial analysis tailored to clientsโ needs.
at@quantessagroup.com
How an engagement works
Simple, fast and transparent
01
Scoping call
Share your objectives and timeline.
02
Build or review
Dedicated analyst, clear communication throughout.
03
Delivery by week 3
Your Quantessa-stamped model, best-practice formatted.
04
Handbook & training
Your team learns to operat it with confidence, with ongoing support.
Letโs talk about your model
Tell us what youโre building or reviewing and we will come back with scope, timeline and price.
enquiries@quantessagroup.com