STEGS™ · Solar thermal generation and storage

Always on.
Always clean.™

Solar thermal generation and storage. Captures heat by day, dispatches firm power around the clock. No batteries. No fuel. No water.

Commission EVMG → See how STEGS works
The problem

The grid has no clean firm-power solution.

Global electricity demand will more than double by 2050. Plans to fill that gap rely on solar PV and wind. Both are intermittent. Neither delivers firm 24/7 power.

  • 20,000 GW of new capacity needed by 2050.
  • 200 GW of new firm generation needed by US data centers alone by 2034.
  • 900 GW of natural gas must retire by 2050. No clean replacement exists.

Source: IEA World Energy Outlook, EIA Energy Outlook Update.

How it works

Capture. Store. Dispatch.

STEGS captures solar heat, stores it, and releases it on demand. No fuel, no batteries.

How STEGS works: collect, store, dispatch 01 · Collect 02 · Store 03 · Dispatch TURBINE GENERATOR POWER
01 · Collect Solar Collector Flat absorber surface
02 · Store Thermal mass Hours of storage
03 · Dispatch Turbine Generator Clean power on demand
Performance

Baseload power. No fuel. No batteries.

Annual capacity factor >90%

vs. 24.9% for utility-scale PV.

Storage duration 48+ hr

Independently validated in 2025 at 400 °C.

Asset life 50+ yr

vs. 25 years for PV.

Module range 1–100+ MW

Modular and expandable.

Values from thermodynamic modelling. Confirmation pending first commercial demonstration in 2028.

Get the technical brief.

Full plant architecture, performance assumptions, and project economics. Delivered as PDF.

Request the brief →
Position

One point on the curve nobody else has reached.

STEGS sits where firm dispatch, low emissions, and material independence intersect — a point no incumbent technology occupies today.

STEGS™
Gas CC
PV + Storage
Wind + Storage
Firm 24/7 dispatch
4 out of 4
4 out of 4
1 out of 4
2 out of 4
100% renewable
4 out of 4
0 out of 4
2 out of 4
3 out of 4
No fuel cost exposure
4 out of 4
0 out of 4
4 out of 4
4 out of 4
No rare earths
4 out of 4
4 out of 4
0 out of 4
0 out of 4
Cost-competitive at scale
4 out of 4
3 out of 4
1 out of 4
2 out of 4

Qualitative comparison of leading firm-power technologies. Detailed cost figures available in the technical brief.

Markets

Built for the loads that never turn off.

Round-the-clock industrial loads where firm clean power is the operating requirement, not the marketing line. STEGS targets the 8,000 km solar belt where 75% of the world's population lives.

Data centres

Behind-the-meter power matched to 24/7 AI training and inference loads. Co-located with the collector field. No grid congestion, no offset accounting, no diesel standby. 200,000 MW of new generation needed in the US over the next decade.

02

Industrial process heat

Cement, chemicals, desalination, district heat. STEGS delivers heat at 300–400 °C without converting to electricity first — the highest-efficiency use of the storage block.

03

Utility grids

Dispatchable baseload to replace retiring coal and gas peakers. Qualifies for firm-capacity procurement. The ORC inverter stack aligns with existing grid interconnects.

04

Off-grid and remote

Mining sites, island grids, defence installations. Single-module installs from 0.5 MW. No fuel logistics, 50-year operational life.

05

Crypto and ERCOT merchant

Wholesale exposure inside the Texas interconnection where firm clean dispatch attracts a structural premium over solar-only hedges.

06

Eco-districts and communities

District-scale firm renewable supply for greenfield campuses and microgrids that need 24/7 carbon-free electricity without battery footprint.

First project · Waco, Texas

Pilot. Commercial. Utility.

A 105 MW data-center opportunity. Phase 1 commercial demonstration, Phase 2 expansion on the same site.

Phase 1 · Commercial demonstration

15 MW

Annual production
120,998 MWh
CAPEX
$50.0M
Annual revenue
$6.3M
Annual OPEX
$1.4M
Payback
6 years
Operation
2028
Phase 2 · Expansion

90 MW

Annual production
725,985 MWh
CAPEX
$250M
Equity requirement
$62.5M
Net profit (10 yr)
$170M
Annual return
14.2%
Payback
End of year 4

Figures from internal modelling. PPA structure under negotiation; ranges exclude renewable attributes and tax benefits.

Future · Utility scale

100+ MW

Configuration
Modular expansion
Storage
48+ hr
Markets
International, post-2030
Module range
1 MW – 100+ MW

PPA under active negotiation. Figures exclude escalators, renewable attributes, and tax benefits.

Roadmap

Confirmed dates. Committed partners.

2025 · Complete

Technology validation

CEMEX concrete tested, stable at 400 °C. System design finalised. Patent application filed.

Apr–Aug 2026

Phase 1 lab testing

STEGS Collector in solar simulator. Storage Block thermal cycling by independent labs.

2027

Phase 1 construction

15 MW commercial demonstration plant in Texas. Contracted data-center load. HDR engineering, DPR construction.

2028

Commercial operation

Phase 1 commercial dispatch. Phase 2 (90 MW) construction begins on the same site.

Beyond 2030: international expansion across the global solar belt. Target of 6,500+ MW installed by 2035.

Get in touch

Talk to the team about a STEGS™ deployment.

Brief us on your load profile and site.

Contact EVMG → Request the spec sheet