STG Stone Gold Inc

Sustainable Energy Technologies (TSX VENTURE:STG), ("Sustainable Energy" or the
"Company") is pleased to report that interest in the BiDirex(TM) enabled
Sonnenbatterie "Comfort" line of grid parallel solar storage systems was far
greater than the Company expected at last week's Inter-solar show in Munich
Germany.


"Based on new customer feedback, we now believe that the product mix will be
biased heavily towards three phase systems with mid range power ratings," said
Brent Harris, CTO of the Company, who provided technical support to Prosol
Invest's marketing team in Munich. "Since each three phase Sonnebatterie system
requires three BiDirex(TM) units, this change in demand mix would increase our
unit sales count beyond earlier expectations," Harris added.


Prosol Invest also announced a cooperation agreement with Solarwatt GmbH that
will see the BiDirex(TM) enabled Sonnenbatterie system integrated into the
Solarwatt Solar Power Storage system. Readers are referred to news releases
issued by Solarwatt and Prosol Invest concerning the cooperation agreement:


-- See Solarwatt GmbH news release dated June 17, 2013 and entitled "SOLARWATT
WITH NEW SOLAR POWER STORAGE SYSTEM" at the Solarwatt website


-- See Prosol Invest news release dated June and entitled "PROSOL Invest liefert
intelligentes Lithium-Speichersystem an SOLARWATT" at the Sonnenbatterie website



Readers are informed that the referenced news releases are not Sustainable
Energy's releases and are provided only for informational purposes. The
statements therein are not Sustainable Energy's statements and may contain
forward looking statements. The reader is cautioned that actual results could
differ materially from current expectations and assumptions contained in such
forward looking statements.


PROSOL Invest Deutschland GmbH

Based near Kempten Germany, PROSOL Invest Deutschland GmbH ("Prosol Invest") is
the German market leader for intelligent lithium based storage systems and has
many years of experience with battery storage technologies and renewable
energies.


Sonnenbatterie is a highly intelligent lithium based solar storage system, which
is much more than just a battery. Sonnenbatterie includes various added values
such as smart home, smart meter and solar PV monitoring. Sonnenbatterie is
available in various system sizes to perfectly cover the demand of small family
to high end houses and small to medium-sized companies or farms. It is ideally
suited to retrofit existing PV systems as well as for new installations. On
average, the users of Sonnenbatterie consume more than 75% of their self
generated electricity. The technology is not only extensively tested, but has
also proven its functionality and reliability in the field since 2010.


About Sustainable Energy

Sustainable Energy (www.SustainableEnergy.com) designs and manufactures advanced
power electronics for distributed smart grid and micro-grid applications.
Advanced power electronics are a critical interface between all distributed
generation and storage systems devices, ensuring the delivery of high quality
alternating current (AC) to the power grid as well as providing utility control
over the interconnection and power quality.


Sustainable Energy's bi-directional low voltage energy storage inverter branded
BiDirex directly connects low voltage batteries to the grid with the power
industry's highest round trip (battery charging and discharging) efficiencies.
The inverter meets tough utility smart grid standards such as Germany's VDE 4105
which is becoming a global standard and enables full utility control over the
battery dispatch and power quality functions.


Sustainable Energy's platform is based on patented breakthroughs in power
inverter design that enable its platform to convert high current/low voltage DC
into high quality AC with conversion efficiencies that are higher than anything
in the market with an inherently lower cost structure.


Forward Looking Information

The reader is advised that some of the information herein may constitute
forward-looking statements within the meaning assigned by National Instruments
51-102 and other relevant securities legislation. In particular, we include:
statements concerning the future demand for energy storage inverters; statements
concerning the efficiency and cost advantages of our energy storage inverters;
and statements concerning the Sonnenbatterie product and statements concerning
Prosol's market share expectations.


Forward-looking information is not a guarantee of future performance and
involves a number of risks and uncertainties. Many factors could cause the
Company's actual results, performance or achievements, or future events or
developments, to differ materially from those expressed or implied by the
forward-looking information. Readers are cautioned not to place undue reliance
on forward-looking information, which speaks only as of the date hereof.


Readers are also directed to the Risk Factors section of the Company's current
Annual Information Form which may be found on its website or at www.sedar.com
The Company does not undertake any obligation to release publicly any revisions
to forward-looking information contained herein to reflect events or
circumstances that occur after the date hereof or to reflect the occurrence of
unanticipated events, except as may be required under applicable securities
laws.


Neither the TSX Venture Exchange nor its Regulation Services Provider (as that
term is defined in the policies of the TSX Venture Exchange) accepts
responsibility for the adequacy or accuracy of this release.


FOR FURTHER INFORMATION PLEASE CONTACT: 
Sustainable Energy Technologies Ltd.
Michael Carten
Chief Executive Officer
+1.403.630.9544
Michael.Carten@sustainableenergy.com
www.sustainableenergy.com


Alliance Advisors, LLC
Valter Pinto
+1.914.669.0222
Valter@allianceadvisors.net

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