Themis Energy Networks

District and communal heating

We buy, upgrade and grow heat networks.

Themis Energy Networks is an owner and operator of district and communal heating. We buy existing networks, invest to bring them up to modern standards and into line with regulation, and grow them at speed. Our mission is to make the best heat networks in the UK, that work for customers, at the lowest possible cost.

Talk to us about your network What we look for

What we do

Raise the standard, drive down the cost

Many heat networks in Britain were built by organisations whose main business is not building and running heat networks. We are set up to design, invest, build and operate them for the long term.

  1. 01

    Buy

    We acquire operational district and communal heating networks from current owners where heat networks are not their core business.

  2. 02 In parallel

    Upgrade

    We invest in plant, pipework, controls and metering so each network runs efficiently and reliably.

    Comply

    We bring each network into line with Ofgem regulation and the technical standards that follow, and keep it there.

  3. 03

    Grow

    We connect more buildings nearby, so fixed costs are shared across more customers.

Twin district heating pipes laid in a long trench beside a city street.
District heating pipes being laid beneath a city street.
A large heat pump and insulated pipework inside an energy centre.
A large heat pump inside an energy centre.
Aerial view of an energy centre with rows of air source heat pump units beside the main building.
An energy centre that draws its heat from the air.

For network owners

Thinking of selling a heat network?

Since January 2026 heat networks in Great Britain have been regulated by Ofgem, and mandatory technical standards are due to follow. For many owners that means new duties, new costs and investment they had not planned for.

Please contact us if a sale could be the better route to helping your heat network meet regulatory standards, serve customers better, and grow at speed.

  • District heating and communal heating
  • Networks that are already operating and supplying customers
  • Older networks that need investment. Upgrading them is what we are here to do
  • Single networks or portfolios

How a conversation with us works

  1. A confidential first callYou tell us about the network and what you want from a sale.
  2. We look at the networkHeat sales, plant, condition, customers and contracts. We know what to ask for and will not waste your time.
  3. We make an offerA clear proposal for the purchase and for how we would look after your customers afterwards.
Start a conversation

Capital

Money to buy, and money to improve

Buying a network is only the start. All existing networks need investment: capital to expand, install new plant, better insulation, modern metering and billing, and work to meet regulation.

Themis is set up to fund both. We bring capital for the purchase and for the investment the network needs post-sale, and we are expert at running and growing heat networks (it’s why we’re here!).

Two pre-insulated district heating pipes lying side by side in a shored trench, seen from the open ends.
Pre-insulated district heating pipes in a trench. A steel pipe carries the hot water, wrapped in insulation and a tough outer casing. Much of the investment in an older network goes into pipework like this.

Where we look

District and communal heating

The engineering differs between the two. The job is the same: reliable heat at the lowest price.
We look at both.

Three-dimensional cutaway of a district heating network: an energy centre with flues and a thermal store sends heat through buried flow and return pipes, shown in an open trench, to a tower block, a mid-rise block, a row of houses and an office, each with its own substation.

District heating

Buried pipes carry heat from one or more energy centres to many buildings: homes, offices, schools and hospitals across a neighbourhood or a town centre.

Three-dimensional cutaway of an apartment building with communal heating: a plant room in the basement, flow and return risers, and a heat interface unit in every flat.

Communal heating

One building or estate with a shared plant room. Risers and laterals take heat to a heat interface unit in every flat.

Our approach

Lowest cost of heat first. Net zero by 2050.

The lowest cost of heat for customers

The number we care about most is what customers pay for their heat. Every investment decision starts there.

  • Cut the heat lost from pipes and plant rooms
  • Run plant efficiently, with modern controls and lower temperatures
  • Meter accurately and bill clearly
  • Add connections, so each customer carries less of the fixed cost

Decarbonisation on a realistic timetable

We believe in decarbonising heat networks, and our plans run to 2050. We will move each network to low-carbon heat as customers wish to buy low-carbon heat (for example new-build) or as regulation requires. We believe economics will move our heat networks to low-carbon well before 2050.

2026203020402050 Efficiency firstLow-carbon heatas customers andregulation call for itNet zero Carbon in the heat supplied
Illustrative only. This shows the order we work in and is not a forecast for any network.

Our team

A highly experienced, senior team

Themis is led by senior professionals who have worked right across district heating and the wider energy sector.

  • Across heat and energy

    Our experience covers district heating, communal heating and the wider energy industry.

  • Running city-scale networks

    We have run heat networks that serve whole cities, so we know what reliable heat takes.

  • Starting new companies

    We have founded energy businesses and built them from a standing start.

  • Raising funds

    We have raised capital from investors for energy businesses and infrastructure.

  • Securing grants

    We have won public grant funding to get heat network projects started.

  • Pioneering work

    We have led genuinely pioneering projects in heat networks and energy.

Contact

Talk to us about your network

If you own a district or communal heating network and are thinking about its future, get in touch. Every conversation is confidential.

contact@themis.energy