Luther Advises ista SE on the Acquisition of Homenergy GmbH

With this acquisition, ista SE is expanding its range of services relating to integrated energy solutions for the decarbonisation of buildings, thereby consistently pursuing its platform strategy in the field of climate-friendly building technology. Over the past four years, Homenergy has sold and installed around 4,500 heat pump and photovoltaic systems; its range of services extends from battery storage systems and wall boxes to home energy management systems and service and maintenance. This brings ista a further step closer to its goal of becoming a full-service provider of integrated energy solutions for buildings. Furthermore, Homenergy offers a fully digitalised customer journey and covers key aspects of the service provision expected of a full-service provider – from sales and technical planning, through project management and installation, to after-sales service. The acquisition comes at a time when the market is undergoing significant change and offers further growth potential:

According to the German Heating Industry Association, heat pumps accounted for more than half of all the approximately 352,000 heat generators sold in the first half of 2026, with 194,500 units sold – an increase of 19 per cent compared with the same period last year. Against this backdrop, the acquisition is of strategic importance to ista – it complements its existing energy services business with a further pillar in the growth market of decentralised building energy.

A Luther team led by partners Dr Björn Simon and Dr Johannes Becker provided legal advice to ista SE on the acquisition and supported the company from the structuring through to the completion of the transaction. The Corporate/M&A team was supported by Luther specialists from the areas of employment law, energy law, commercial law and IP/IT. For this transaction, ista has once again relied on the advice of this well-known, well-coordinated team – Luther had most recently advised ista on the acquisition of Chargemaker GmbH and the purchase of SGW Metering.

Jens Busse, Head of M&A at ista, commented on the renewed collaboration as follows: “The team led by Dr Björn Simon and Dr Johannes Becker supported us once again during this competitive transaction process and successfully brought the transaction to a close within a very short timeframe. Luther’s advice stood out in particular because the advisory team has a very thorough understanding of the operational issues in the energy sector and provided us with excellent support in structuring the transaction, which involved several founders and a number of financial investors on the selling side.”

Dr Björn Simon also emphasises this: “This transaction exemplifies just how inextricably linked legal transaction advice and operational issues in the energy sector have become. Anyone wishing to provide successful advice in this environment must understand the client’s business model as well as the regulatory and contractual framework.”

About Homenergy:

Homenergy is a provider of energy solutions for residential buildings, founded in 2022. The company specialises in the planning and installation of heat pumps and photovoltaic systems, and offers complementary solutions such as battery storage, wall boxes, home energy management, as well as maintenance and servicing. Homenergy employs around 65 staff and has offices in Munich and Essen.

About ista SE:

ista is a leading international company in the management of energy and water consumption. Through its digital products and services, ista provides transparency regarding energy consumption and supports owners, property managers and residents in identifying potential savings and improving the energy efficiency of buildings. ista’s solutions are used in residential and commercial properties by more than 470,000 customers worldwide. The company employs around 7,300 staff in 20 countries and operates more than 50 million wireless meters. In 2025, the expanded ista Group generated turnover of around 1.3 billion euros. Further information is available at www.ista.com/de

For ista SE:

Luther, Corporate/M&A: Dr Björn Simon (Partner, lead), Dr Johannes Becker (Partner), Dr Sven C. Stumm MJur (Counsel), Dr Denis Schütz (Senior Associate), Tim Schinkel, LL.M. (Senior Associate), Victoria Ehrensperger (Associate)

Luther, Employment Law and Pensions: Paul Schreiner (Partner), Nina Stephan (Counsel)

Luther, Property and Construction Law: Ruth-Maria Thomsen (Partner), Max Luca Kalus (Associate)

Luther, Commercial: Dr Maximilian Dorndorf (Partner), Dr Maresa Hormes (Counsel)

Luther, IP/IT: Dr Maximilian Dorndorf (Partner), István Fancsik, LL.M. (Senior Associate)

Luther, Energy Law: Dr Angelo Vallone (Partner), Benedikt Rechner (Counsel)

Luther, Competition Law and Investment Control: Dr Sebastian Felix Janka, LL.M. (Partner), Dr Alexander Ehrle, LL.M. (Partner), Sabrina Aurnhammer (Associate)

Luther, Banking and Insurance Law: Dr Rolf Kobabe (Partner), Dr Alexander Mönnig, LL.M., E.M.L.E. (Counsel), Stefan Jokel (Counsel)

Luther, Tax Law: Nicole Fröhlich (Partner)