Energy Storage · Engineering · Strategy

Independent BESS specialists.
Decisions backed by evidence.

Technology-neutral engineering and advisory for battery energy storage and hybrid energy systems. We safeguard the technical quality, reliability and profitability of high-value energy assets, from the investment decision through to day-to-day operation.

Request a technical consultation Explore our projects
Trusted across the entire storage value chain
Developers and IPPs Infrastructure funds Industry and energy-intensive users EPCs and OEMs (buy-side)
+15 GWh
Project involvement
30+
Countries
25+
Years of experience
5
Continents

Truly independent

We don't sell equipment and we're not tied to any EPC or OEM. Our only mandate is to protect your interests.

We work with evidence

Every analysis or recommendation is backed by a verifiable, documented source. No generalities, no unsupported claims.

Full life cycle

Strategy and FID → engineering and design → Owner's Engineer → operational optimisation and M&A.

Why thebesstEnergy

The energy market needs independent BESS experts

Modern energy systems face structural challenges: the intermittency of renewables, a global shortage of BESS specialists, overlapping technical and financial risks, and operational performance below expectations.

Most advisors are EPCs or OEM-dependent integrators. We are independent technical specialists with global grid-scale BESS experience, technology-neutral and committed to defending the asset owner.

Technology-neutral

We don't sell equipment. Our role is to protect your investment.

Global reach

Projects across 5 continents, including the world's largest integrated BESS.

Full life-cycle coverage

Design → engineering → construction supervision → operation.

Solar and BESS project
1,680 MWh
Largest integrated BESS
(Waratah Super Battery)
Our services

End-to-end technical and strategic advisory

From concept to operation: integrated solutions for BESS and hybrid energy systems.

Featured

Strategy and Due Diligence

Buy-side technical and contractual review ahead of FID, with prioritised, evidence-based findings.

  • Technical and contractual DD (EPC / LTSA / O&M)
  • CAPEX/OPEX and LCOS modelling
  • Performance guarantees and liquidated damages
  • Regulatory and bankability review

Engineering and Design

System design and technical specification for standalone and hybrid plants.

  • BESS sizing and modelling
  • Hybrid PV+BESS integration (AC/DC)
  • Grid and interconnection studies
  • Grid-forming and EMS architectures

Owner's Engineer

Independent supervision that keeps quality, schedule and contracts under control.

  • EPC supervision
  • QA/QC protocols
  • FAT/SAT testing
  • Warranty and claims management

Operational Optimisation

Maximise revenue and extend asset life across the entire operating window.

  • Revenue stacking (arbitrage + ancillary services + capacity)
  • Performance and degradation analysis
  • Augmentation strategy
  • Life-extension planning
New

Transaction and M&A Advisory

Technical partner to funds and IPPs across the full deal cycle.

  • Buy-side and sell-side technical advisory
  • Portfolio and asset valuation support
  • Red-flag and confirmatory DD
  • Lender's technical advisor (LTA)

Not sure where to start?

Tell us about your project and we'll point you to the right entry point: DD, engineering or optimisation.

Talk to an engineer
How we work

We support the investment decision from start to finish

We plug in at the point in the life cycle where we add the most value —from strategy to FID, and from construction to operation— always as independent, owner-side engineers.

01

Strategy and feasibility

CAPEX/OPEX and LCOS modelling, regulatory and grid-access fit (including flexible access, RDL 7/2026) and definition of the project scope.

02

Due diligence and FID

Independent technical and contractual review (EPC, LTSA, O&M), performance guarantees and liquidated damages, with risks prioritised so you can decide with confidence.

03

Engineering and construction

Sizing and design, PV+BESS hybridisation (AC/DC), Owner's Engineer, QA/QC protocols and FAT/SAT testing.

04

Operation and value

Optimisation and revenue stacking (arbitrage, ancillary services and capacity), degradation management and augmentation strategy.

Backed by more than +15 GWh of project involvement and in-house grid-forming R&D.

Projects

What we work on and where we come from

From ongoing engagements to a track record of landmark projects worldwide.

BESS configurations we address

We work across the full spectrum of utility-scale storage.

Standalone BESS

Grid-connected standalone storage for arbitrage and ancillary services.

Hybrid with renewables

Co-location of renewable generation and storage, to manage curtailment and stack value.

Behind-the-meter industrial

Battery behind the meter for large energy-intensive users, powering the industrial facility.

Recent engagements as thebesstEnergy

A selection of ongoing mandates. Client names and figures are kept under NDA; details are available under confidentiality.

Track record: landmark projects

Large-scale projects our team has been involved in: more than +15 GWh of BESS across 5 continents, from a range of perspectives —planning and permitting, systems integration, strategic and technical due diligence, power electronics and grid integration, plant optimisation and transactions/financing.

Waratah Super BatteryBESS
New South Wales, Australia

Waratah Super Battery

The world's largest integrated BESS, providing grid stability to New South Wales.

850MW
1,680MWh
2024Year
Owner/Developer: Akaysha Energy (BlackRock)
BESS supplier: Powin
Power conversion: eks Energy (Hitachi Energy)
Andes Solar II-BHybrid
Antofagasta, Chile

Andes Solar II-B

High-altitude hybrid solar plant with battery-intensive storage in the Atacama Desert.

180MWp PV
650MWh BESS
2022Year
Owner/Developer: AES Andes (AES Corporation)
BESS technology: Fluence (Siemens/AES)
Power conversion: GPTech (Hitachi Energy)
Lawai Solar + StorageSolar + Storage
Kauai, Hawaii, USA

Lawai Solar + Storage

A pioneering solar-plus-storage project that lets Kauai run on 100% renewable energy after sunset.

28MW Solar
100MWh BESS
2019Year
Owner/Developer: AES Distributed Energy
Battery supplier: Samsung SDI
Inverters: GPTech (Hitachi Energy)
Benban Solar ParkSolar PV
Aswan, Egypt

Benban Solar Park

Grid-scale solar within one of the world's largest installations, positioning Egypt as a green benchmark.

166.5MW PV
3Plants
2020Year
Developers: Infinity Solar, ib vogt, Phoenix…
PV inverters: GPTech (Hitachi Energy)
Lenders: IFC, EBRD, AIIB, CDC

Our partners' engineering, permitting and finance

Decades of electrical infrastructure, environmental permitting and energy project finance, before founding thebesstEnergy.

High-voltage electrical infrastructure and renewablesEngineering · HV & renewables
Spain · United Kingdom · Germany

Renewables engineering and industrial infrastructure

Led a multidisciplinary engineering firm in renewables, high voltage and industrial and port projects, with subsidiaries in the United Kingdom and Germany.

~€8MRevenue/year
3Countries
17Years
TBE partner: Rodrigo Delgado
Firm: Gabitel Ingenieros (2006–2023)
Environmental permitting of renewable plantsPermitting & sustainability
Spain

Environmental permitting of renewable plants and BESS

Environmental assessment and permitting of renewable projects and BESS with the sector's leading developers.

300+Permits
20+Years
TBE partner: Juan de Gorostidi
Firm: Agroforestal Acebo
Energy project finance and M&ACorporate & project finance
Europe · International

Energy project finance and M&A

Financing structuring and M&A transactions in energy worth more than €10bn: solar 4 GW+, BESS 5 GWh+, hydrogen 1 GWe+, CSP 500 MW+ and wind 2 GW+.

€10bn+In transactions
5 GWh+BESS
4 GW+Solar
TBE partner: Grant Greatrex
Scope: Corporate & project finance
Insights and research

Knowledge that moves projects forward

Proprietary analysis drawn from our work on the front line of storage. Download a summary or talk to the author.

Featured report · 2025–2026

BESS OEM Bankability Report

An independent benchmark of the leading BESS OEMs —technology, track record and bankability— to de-risk supplier selection.

Regulatory note · Spain

Flexible grid access for BESS (RDL 7/2026)

What the new flexible-access framework means for storage and hybrid projects connecting to a congested grid in Spain.

R&D · Grid-forming

Grid-forming storage R&D

We take part as technical author and work-package lead in a publicly co-funded R&D consortium advancing grid-forming BESS for weak grids with high renewable penetration.

Founding partners

A top-tier team

Engineering, strategy, finance and execution: over 25 years of experience in each discipline.

Javier Landero

Javier Landero

CEO & CTO · BESS Technical Lead

Over 20 years in the energy sector. Co-founder and CEO of GPTech (acquired by Hitachi Energy). More than 200 projects across over 30 countries, including the world's largest BESS (Waratah, 1,680 MWh).

Rodrigo Delgado

Rodrigo Delgado

Head of Business Development

Telecommunications engineer and MBA. Co-founder of TENG FORCE and GABITEL (€8M, UK/Germany). Former regional Engineering director at Endesa (60 people, €40M). Expert in high voltage, wind and solar.

Juan de Gorostidi

Juan de Gorostidi

Permitting and Sustainability Director

Forestry engineer and international sustainability auditor (FSC, PEFC, SURE and AWS). More than 20 years in environmental engineering and over 300 permits successfully processed. Senior consultant ESG for WWF, SER and DNV.

Grant Greatrex

Grant Greatrex

Head of Strategy and Corporate Finance

Economist (LSE) and MBA (Warwick). Former partner at Deloitte (18 years) and at Arthur D. Little (global renewables partner). More than €10bn in M&A and project finance transactions. Expert witness in over 50 arbitrations.

Let's build the future of energy storage together

Every project we take part in becomes technically sound, financially optimised, reliable in operation and future-ready.

Request a technical consultation See our projects
Let's talk

Ready to discuss your project?

Whether you're planning a new BESS, hybridising a PV plant, managing a transaction or optimising an operating asset, our team is ready to help.

Email

contacto@thebesstenergy.com

Headquarters

Madrid, Spain — global coverage

Markets

Europe, the Americas, MENA, Oceania

LinkedIn

thebesstEnergy

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