Energy consulting meets AI-powered accounting and tax advice

Decarbonizing existing buildings with heat pumps in the most cost-effective way: this is the goal Hilko Pastoor and Kamil Beehuspoteea have pursued since 2020. Since March 2026, the two founders have been using GNU Energy to help companies cut CO₂ emissions and heating costs and achieve energy independence.

Hilko Pastoor
Co-founder & Managing Director, GNU Energy
Hilko PastoorGNU Energy

Both founders had bad experiences with tax advisors before. Their firms were barely digital, rarely got in touch on their own and stayed vague about costs. They wanted the new company to work differently, so they chose Integral.

Getting started with Integral

Onboarding took six days. Connecting the tools the founders already used was part of that start, so transactions and documents reached Integral from day one. Nobody uploads anything by hand or sends it by email.

”
I’m really happy with Integral at the moment. It’s exactly what I stand for: efficiency and digital processes instead of wasting resources.
Hilko Pastoor
Hilko Pastoor
Co-founder & Managing Director, GNU Energy

Qonto and cleverlohn in one set of books

GNU Energy’s Qonto business account and its payroll through cleverlohn are connected to Integral. Every transaction and payroll run arrives on its own, so nobody at GNU Energy exports a file. The platform matches each one and prepares the booking.

”
I’m really happy with Integral at the moment. It’s exactly what I stand for: efficiency and digital processes instead of wasting resources.
Hilko Pastoor
Hilko Pastoor
Co-founder & Managing Director, GNU Energy

Predictable costs

Their previous firms billed by the hour, so the cost was only clear afterwards. At Integral, the team pays a fixed monthly price for all agreed services. The founders always know what to expect and ask questions without thinking about the next invoice.

”
I’m really happy with Integral at the moment. It’s exactly what I stand for: efficiency and digital processes instead of wasting resources.
Hilko Pastoor
Hilko Pastoor
Co-founder & Managing Director, GNU Energy

Working together day to day

All questions go to one place on the Integral platform, instead of spreading across emails and phone calls. A dedicated contact who knows the company answers them there. Letters from the tax office and all tax documents are on the platform too, ready to view and download at any time.

AI agents prepare the ongoing bookkeeping. Integral’s tax team of experienced tax advisors and accountants checks every step before a BWA goes to GNU Energy or a VAT return is ready for approval.

The document reconciliation rate was 100% from March to July and in October, 92% in August and 96% in September.

”
I’m really happy with Integral at the moment. It’s exactly what I stand for: efficiency and digital processes instead of wasting resources.
Hilko Pastoor
Hilko Pastoor
Co-founder & Managing Director, GNU Energy

Efficiency through AI

GNU Energy automates its own work too. Through Integral’s MCP interface, the team handles invoices and reports straight from its own tools. On top of that, the founders built their own AI agents to automate more of their back office.

”
I’m really happy with Integral at the moment. It’s exactly what I stand for: efficiency and digital processes instead of wasting resources.
Hilko Pastoor
Hilko Pastoor
Co-founder & Managing Director, GNU Energy
Onboarding
6
days
until onboarding at GNU Energy was complete.
Connected
Document reconciliation rate
100
%
of documents reconciled in six of the eight months since the start in March.
”
We’re looking for a long-term relationship with Integral. I’m super convinced Integral is the right partner for bookkeeping and tax advisory.
Hilko Pastoor
Co-founder & Managing Director, GNU Energy

Six people, one tax team.

Tax advisors, auditors and tax operations work in the same platform as Hilko and Kamil. Every question reaches someone by name.

Daniel
Daniel
Auditor and Managing Director
Steffi
Steffi
Senior Tax Advisor
Bernd
Bernd
Senior Tax Advisor
Helga
Helga
Tax Operations Lead
Pepe
Pepe
Senior Tax Operations Associate
Claudia
Claudia
Tax Operations Associate

Tax advice for energy consultancies.

Integral handles accounting and tax advice for energy consultancies like GNU Energy. You get a dedicated tax team, a fixed monthly price and a platform connected to your tools.

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