Pakistan · Switzerland

Heat is the battery.
Ceramic is the cell.

ThermoVolt stores electricity as heat in locally manufactured refractory ceramics — from 12 kWh residential geysers to multi-MWh industrial process-heat batteries.

1,000°C

High-temperature storage class

30+ years

Ceramic core lifetime target

Local minerals

Designed for Pakistani manufacturing

One platform: 12 kWh (home) · 36 kWh (small business) · 72 kWh (tandoor) · 400 kWh (industrial module) · 10 MWh (container-scale)

Heat Battery

A Battery — But for Heat.

ThermoVolt stores renewable electricity as high‑temperature heat and delivers it directly as useful heat. It is not an electricity “power bank” — it is built for the dominant end‑use in Pakistan and industry worldwide: hot water, space heating, and process heat.

Electricity → ThermoVolt → Heat

Solar / Grid Electricity → Ceramic Thermal Storage → Hot Water · Space Heat · Industrial Process Heat

🏠 Domestic

Hot‑water geysers and residential heat — charged from rooftop solar or the grid, dispatched as heat on demand.

🏪 Small Business

Guest houses, kitchens, laundries, workshops — scalable heat storage that replaces unreliable gas and expensive diesel.

🏭 Industrial

Modular process heat (hot air / steam) from hundreds of kWh to multi‑MWh — the same platform scaled in geometry.

Charge from Any Source

Store heat cheaply.
Use heat on demand.

ThermoVolt stores electricity as heat with near‑100% electricity‑to‑heat conversion in the heating elements (resistive). The source doesn’t matter — what matters is charging when electricity is abundant and releasing heat when it is needed. No inverter is required for the heating elements, and there is no electrochemical capacity fade in the ceramic core.

☀️

Rooftop Solar Surplus

Over 18 million Pakistani households have solar panels with no net metering and no way to store midday surplus.

ThermoVolt charges directly from that stranded electricity — no grid connection, no DISCO contract, no inverter losses.

Perfect for residential and peri-urban installations where rooftop PV is already installed.

No Grid Required

⚡

Grid at Peak PV Hours

Pakistan has set a target of 60% renewable energy by 2030 — already at 53% and accelerating.

High renewable penetration creates midday surplus and drives dynamic grid tariffs.

Thermal batteries can charge from the grid at lowest-tariff hours, then deliver heat for free all day.

Enables urban tandoors, city hospitals, and hotels with no rooftop access to benefit from Pakistan’s solar transition.

Grid-Compatible

100%

Electricity → Heat efficiency

Zero

Conversion losses for thermal end uses

10,000+

Thermal cycles potential (ceramic core)

Core Materials

Two Materials.
Two Functions.
Both Made in Pakistan.

ThermoVolt is built on two distinct ceramic technologies — each chosen for its specific role, both sourced and manufactured entirely within Pakistan.

Storage Core: Alumina-based Refractory

Built to store energy as sensible heat at up to ~1000°C

Aluminium comprises ~8% of Earth’s crust (by mass), mostly as aluminium-bearing minerals that support alumina-based refractories.

For storage, alumina wins on the physics of scale: high density combined with high solid heat capacity delivers strong energy density in a simple, durable material that is abundant and geopolitically de-risked.

As an air-stable oxide ceramic, alumina refractories are engineered for furnace duty and long service life under thermal cycling. The ceramic core is designed for decades (target ~30 years); heaters and sensors are service parts.

High-temperature stability for bulk storage
High density + high solid heat capacity
Local, abundant, non-toxic, recyclable

Storage core — pressed refractory elements — Storage core in practice — pressed refractory elements

Heat Processing: Specialised Ceramics

Shaped components that manage airflow, mixing, and heat exchange

For manifolds, mixers, valve modules, and flow channels, we use specialised engineering ceramics chosen for manufacturability and thermal cycling performance. They can be formed into complex geometries, hold tight tolerances, and handle repeated expansion/contraction with excellent dimensional stability.

Both material families are local, affordable (5% of Inconel600 steel price), proven in kilns and furnaces for centuries, and recyclable at end of life.

Complex shapes via local ceramic forming
Excellent thermal shock / cycling resilience
Low expansion for alignment and sealing

Slip-cast specialised ceramics — Heat-processing components — slip-cast specialised ceramics

Small-Mass Problem

Solving the
Small-Mass Problem

Every thermal battery faces a fundamental physics constraint. As the storage mass shrinks, surface area decreases more slowly than volume — so small masses at 1,000°C lose heat disproportionately through their surface. The conventional engineering response is more insulation: thicker, heavier, costlier. The unit grows. The economics worsen. This is why virtually every thermal storage system on the market targets utility scale. The physics of small masses at high temperature appears to make residential deployment uneconomical.

ThermoVolt resolves this differently. Rather than fighting parasitic heat loss with insulation alone, ThermoVolt’s architecture recovers it by design. The 1,000°C ceramic core is embedded within the water vessel — so heat that would otherwise leak becomes the primary useful output. Parasitic loss and productive output are the same thing. The insulation boundary is drawn around the entire system, not just the core.

Field Validation

Proven Under
Real Conditions

Our first commercial prototype is the ThermoVolt 12 kWh residential geyser (Beta V5): a 100-liter unit designed to deliver roughly 300 liters/day of ~60°C hot water, with multi‑day retention from a single charge under typical household draw patterns. This model is currently being piloted with support from Swiss REPIC as our first funded field deployment.

Gujranwala field trial · Thermal mass, heat exchanger, water & insulation temperatures · 4-day charge/discharge cycle

Field trials in Gujranwala validate performance under Pakistan's demanding climate: 45°C+ ambient temperatures, dust, humidity, and voltage fluctuations.

🌡️ Thermal Mass Core (1,000°C)

Multiple charge/discharge cycles recorded. Core temperature climbs to 1,000°C+ during charging, holds heat through multi-day discharge without supplemental energy.

💧 Water Delivery (60–72°C)

Water temperatures consistently reach ~60–72°C per cycle — sufficient for sanitation and domestic hot water. Demonstrated output: ~300 L/day from a 12 kWh / 100 L unit (usage dependent).

♨️ Hot-Water Retention (Multi‑day)

With the insulated 1,000°C thermal core, the 12 kWh / 100 L unit can retain useful hot water for up to ~5 days after a full charge (site and draw profile dependent).

🧱 Insulation Performance

Five-layer insulation stack shows well-controlled heat gradient — minimal losses at the outer shell, confirming multi-day storage without backup fuel.

📡 Remote Monitoring

ESP32 controller with 4G telemetry provides continuous field data. This MRV stream is designed to support carbon-credit pathways (e.g., Gold Standard / Article 6), subject to methodology and program requirements.

Safety & Maintenance

Built for Daily Cycling

ThermoVolt is designed for domestic hot-water service: typical operation stays below 90°C at the water side, with passive and electronic safeguards. The ceramic core does not capacity-fade like electrochemical batteries; routine service focuses on accessible wear parts.

🛡️ Pressure & Over‑Temp Protection

Double‑cylinder SS304 water body rated for domestic pressure service, with a 3‑bar pressure relief valve (PRV) and temperature control logic to prevent runaway heating.

🔧 Serviceable Wear Parts

Heaters, sensors and seals are designed for straightforward replacement. The refractory thermal core is intended for long life under repeated thermal cycling.

🏠 Corrosion‑Resistant Water Side

SS304 construction, clean weld geometry, and conservative temperatures support long tank life. Monitoring can flag abnormal behavior early for preventive maintenance.

Intelligent Charging

The Smart Gateway:
Charge at the Right Moment

The ThermoVolt controller monitors household electricity, PV output, and grid tariffs in real time — routing surplus energy into the thermal battery at precisely the moments when it would otherwise be wasted or cheapest.

As Pakistan's grid moves toward 60% renewables by 2030, dynamic tariffs will make this intelligence increasingly valuable. The controller is the bridge between Pakistan's evolving electricity market and the thermal battery at its core.

☀️

PV Surplus Detection

Controller monitors rooftop PV output. When generation exceeds household consumption, surplus is routed to the thermal battery rather than lost.

⚡

Grid Tariff Awareness

In grid-connected installations, the controller tracks dynamic tariffs. It charges the battery during low-tariff peak-PV windows — and stops when tariffs rise.

🧱

Thermal Storage

Electricity drives FeCrAl heating elements embedded in the alumina core — converting electricity to heat at 100% efficiency, no inverter needed.

📡

Carbon Credit Telemetry

4G data stream records operational data that can support MRV of LPG or gas displacement. Designed to enable carbon-credit pathways (e.g., Gold Standard / Article 6), subject to methodology and program requirements.

Product Range

12 kWh to 10 MWh —
One Ceramic Core

Every product shares the same alumina refractory core, manufactured on the same line at Ismail Ceramics. Starting with residential, proving the technology, scaling upward.

kWh · Residential

Residential Geyser

100 L integrated tank delivering ~300 L/day at ~60°C, with up to 5‑day reserve. SS304 double‑cylinder at 3 bar with PRV. Replaces LPG geyser entirely. Charges from rooftop PV.

Field Trials

kWh · Commercial

Commercial Geyser

Hotels, guesthouses, hospitals, schools. Modular ceramic cores, triple residential capacity. Solar or grid charging.

Scaling

kWh · 400°C+

Thermal Tandoor

Commercial tandoor for bakeries and restaurants. Eliminates daily gas. Can charge from the grid at off-peak rates — no rooftop access needed.

Scaling

400+

kWh · Industrial

Modular Hex Battery

Hexagonal-module industrial battery. Scalable to 10 MWh per container. Process heat for textiles, food processing, ceramics firing.

Development

Industrial Integration

The Industries
That Can't Wait

Pakistan's industrial sector burns imported gas for heat it could store from solar. ThermoVolt replaces the burner — not the factory. Four prominent examples below; the platform extends equally to agro-processing, grain and timber drying, glass, cement, chemicals, and more.

🧵 Textile · 120 – 220 °C

Spotless White — Zero Contamination Heat

Gas-fired stenters cause burner soot, fabric yellowing, and export rejects. ThermoVolt supplies combustion-free hot air across drying and heat-setting lines — eliminating a direct quality and compliance liability for Pakistan's largest export sector.

⚙️ Steel Re-Rolling · up to 750 °C

15 kg of Free Steel per Ton Rolled

The 400–800 °C gas-fired pre-heat zone produces up to 90% of total scale loss in re-rolling furnaces. ThermoVolt injects combustion-free hot air into the cold end of tunnel furnaces, eliminating oxidation through the most destructive temperature band.

🧱 Brick & Ceramic Kilns · 700 – 1200 °C

From Smog Villain to Climate Pioneer

Pakistan's bull's trench brick kilns and ceramic tunnel kilns burn coal and waste fuels continuously. ThermoVolt modules inject clean high-temperature air into pre-heat and firing zones without full kiln replacement — enabling emissions compliance, reduced fuel cost, and low-carbon product certification. iTerra operates inside Pakistan's leading refractory ceramics manufacturer.

♨️ Industrial Steam · 120 – 250 °C

Keep Your Pipes. Ditch Your Burner.

Gas-fired boilers are the largest and most volatile OPEX item across Pakistani industry. ThermoVolt displaces the burner while leaving existing steam distribution networks unchanged. Solar-charged steam — fuel-free, price-stable, zero combustion emissions.

Pakistan's Energy Transition

The Demand is
Already There

Pakistan is in the midst of an unplanned solar revolution — 18 million rooftop systems installed not because of incentives, but because grid electricity became unaffordable. Renewables now supply 53% of electricity, with a target of 60% by 2030.

The result is a massive, stranded solar asset and an emerging dynamic tariff environment. Meanwhile, households and SMEs continue burning imported LPG and gas for water heating and cooking — the dominant energy end-uses.

When the end use is heat, the optimal storage medium is heat. Pakistan doesn't need lithium, cobalt, or nickel. It needs clay, alumina, and wire — all domestic, all affordable, all available now.

~70%

Residential energy consumed as heat

60%

Renewable target by 2030

$17B

Annual fossil fuel import bill

18M+

Solar systems installed

Market Position

Built for the Missing Middle

Global thermal storage leaders target utility-scale plants in developed markets. iTerra targets the segment nobody else is designing for: Pakistan's 18 million solar households and hundreds of thousands of SMEs.

Company	Scale	Temperature	Target Market	Manufacturing
Rondo Energy	10–100+ MWh	~1,200°C	US/EU heavy industry	US factory
Antora Energy	10–100+ MWh	1,500–2,400°C	US industry + grid	US factory
MGA Thermal	5–100+ MWh	~650°C	AU/EU power stations	Australia
iTerra ThermoVolt	12 kWh – 10 MWh	1,000°C	Pakistan SMEs & households	Gujranwala, Pakistan

Founding Team

Three Decades of
Pakistan Experience

Reto Stocker (PhD)

CEO & Co-Founder

PhD in Global Climate Change. 28 years with the ICRC as Country Director in Afghanistan, Pakistan, and Iran. Based in Pakistan since 2003. Combines deep operational experience with hands-on materials science and engineering expertise.

Farhana Stocker

Co-Founder & Social Impact

Social development specialist with extensive experience in community programme design and women's empowerment across Pakistan. Leads iTerra's social impact strategy, ensuring ThermoVolt deployments address the lived energy needs of Pakistani households.

Irfan Yousuf (PhD)

Co-Founder & Energy Policy

Pakistan's leading carbon credit specialist and former Energy Advisor to the Government of Pakistan. Leads carbon credit strategy and government liaison, with direct access to regulatory frameworks and institutional partnerships essential for scale-up.

Collaboration

Local Manufacturing,
Swiss Partnership

Appropriate technology must be manufactured where it is deployed — using local materials, local skills, and local industry.

Manufacturing Partner · 🇵🇰 Gujranwala

Ismail Ceramics

Pakistan's leading refractory ceramics manufacturer. iTerra operates an embedded R&D laboratory within Ismail Ceramics' facility — from raw clay formulation to production-scale manufacturing. The entire supply chain, from mined earth to fired ceramic, stays within Pakistan.

Co-financing Partner · 🇨🇭 Switzerland

REPIC Platform

The Swiss Interdepartmental Platform for Renewable Energy, Energy Efficiency, and Resource Efficiency in International Cooperation. REPIC co-finances iTerra's pilot deployments across three Pakistani cities, validating ThermoVolt's performance and carbon credit generation under real field conditions.

REPIC Platform

Heat is the battery.Ceramic is the cell.

A Battery — But for Heat.

Store heat cheaply.Use heat on demand.

Two Materials.Two Functions.Both Made in Pakistan.

Solving theSmall-Mass Problem

Proven UnderReal Conditions

Built for Daily Cycling

The Smart Gateway:Charge at the Right Moment

12 kWh to 10 MWh —One Ceramic Core

The IndustriesThat Can't Wait

The Demand isAlready There