An engineering company for renewable energy
IEE plans photovoltaic systems, battery storage, heat pumps and EV charging points across Germany and takes responsibility for them through to commissioning. Planning, electrical design and grid registration are done in house, in twenty departments across three buildings of our own in Gifhorn, Lower Saxony. Installation is done by our crews and by partner companies we select and qualify ourselves.
An engineering office, not a call centre
Fifty-nine people work in twenty departments across our three buildings in Gifhorn, alongside a field sales organisation of roughly two hundred representatives. The structure is the argument: a company that sells but does not plan has no reason to run separate DC and AC engineering teams.
Planning and engineering in house
Every system is designed and calculated individually. DC planning and AC planning are two separate departments, not one desk with two job titles.
Grid registration is its own department
Five people work on nothing else. In Germany every distribution grid operator runs its own procedure, and registration and commissioning notification are two separate filings. We handle both and issue the installer's declaration ourselves.
Installation crews in three trades
DC, AC and heat pump crews, our own and from partner companies we select and qualify, alongside warehouse and logistics, fleet management and after-sales service.
No quotation without a site visit
We check the structural, electrical and consumption situation on site before we put a figure on paper. If a system does not pay for itself, we say so.
What we have built so far
Figures as at 8 July 2026, from our own project planning department. These are counted installations, not projections, and they do not tick upwards on their own.
What we actually use
Model designations, warranty terms and certification standards, so there is something concrete to compare against.
Bauer Solar
PV modules- Models
- BS-96G12HBB-GG glass-glass, 460 to 470 Wp, and BS-108M10BCBT-GG back contact, 485 to 495 Wp
- Warranty
- 30-year product and performance warranty, reinsured with Munich Re. At least 87.4 per cent output after 30 years.
- Certification
- IEC 61215, IEC 61730, fire class A, hail class HW3, up to 6,100 Pa
AlphaESS
Battery storage- Models
- SMILE-G3 series, single-phase S5 and three-phase
- Warranty
- 10-year warranty, extendable to a 25-year linear performance warranty.
- Certification
- VDE-AR-N 4105
Vaillant
Heat pumps- Models
- aroTHERM plus, VWL 35, 55, 75, 105 and 125
- Warranty
- 5-year warranty at no extra cost.
- Certification
- ErP A+++, EN 14511, EN 14825
AlphaESS
EV charging- Models
- SMILE-G3-EVCT11 wallbox, 11 kW, with integrated 6 mA DC fault current protection
- Warranty
- 2-year product warranty.
- Certification
- CE, EN 62133, IP54
Everything here can be checked
We are a German limited company. The entries below are public and can be verified in the German commercial register.
Our legal notice and privacy policy are published in German only. German is the authoritative version.
Rated by the people who had it installed
Speak to the people who do the work
Call +49 5371 5898857 or write to info@iee-solar.de. We answer in English.