STG Stone Gold Inc

Sustainable Energy Technologies Ltd (TSX VENTURE:STG) "Sustainable Energy" or
the "Company"), a manufacturer of intelligent power electronics for
decentralized generation and storage systems is pleased to confirm that
Sonnenbatterie's new product line "Comfort" powered by BiDirex will be on
display and available for order at Intersolar June, 2013 in Munich.


Prosol Invest GmbH release dated June 3, 2013:

"New solar battery comfort will be presented at the Intersolar 2013 in Munich."

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.


About Prosol Invest Deutschland GmbH

Based near Kempten Germany, PROSOL Invest Deutschland GmbH 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 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.


The inverter's software configurable platform has been designed from the ground
up to be easily integrated into power management systems, with the industry's
only open industry standard communications software to support a highly cost
competitive OEM strategy and allowing rapid development of OEM partner product
solutions.


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 materially 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, it includes:
statements concerning the impact of Sustainables' technology on solar PV system
performance; statements concerning market outlooks; and statements concerning
the potential for sales revenues. While management believes these statements to
be accurate they are dependent on a wide range of factors beyond management's
control and should not be viewed as a guarantee of the specific outcome.
Forward-looking information is not a guarantee of future performance and
involves a number of risks and uncertainties.


Many factors could cause the Companies' 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. The Companies do 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.


FOR FURTHER INFORMATION PLEASE CONTACT: 
Sustainable Energy Technologies Ltd.
Michael Carten
Chief Executive Officer
403.630.9544
Michael.Carten@sustainableenergy.com
www.SustainableEnergy.com

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