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IN 2017 AND 2018, ABANDONED POWER IN THE NATION TOTALED
MORE THAN THE ANNUAL GENERATION OF THE THREE GORGES DAM

power) and output profits (of RNG, heat TABLE 2 SUMMARY LIST OF GENERAL ASSUMPTIONS FOR THE SYSTEM
and O₂) only, it can be predicted that
once the recovered heat (combined with General assumptions Unit Fixed
O₂) is sold at 210RMB/MWh, a balance
of cash flow can be achieved with an Project CAPEX % of installed CAPEX 25%
electricity price of 150RMB/MWh. WACC - 8.00%
However, as CAPEX and O&M costs Load factor h/year 8760
are involved, the system will hardly be
profitable at this time. CO2 cost RMB/Nm3 0.25
The LCOXs are calculated as shown Products market prices Unit Fixed
in Table 3. RNG price RMB/Nm3 3.1
In 2025, the situation improves. It
is possible for the PtG system to find Alkaline electrolysis Unit Fixed
economic balance by selling the RNG at Equipment power MW 1
a higher price. In 2030, the system will
have a greater possibility of sustainable H2 production m3/h 200
profitability. Biogical methanation Unit Fixed
Heat production MWh/h 0.32
Conclusions and future work
Conclusions Methanation CO2 consumption Nm3CO2/Nm3RNG 1
Considering the energy storage and
load characteristics of PtG, it is an ideal
solution for the problems facing the considered to be a constant in this TABLE 3 LCOX RESULTS
Chinese energy internet. phase. However, as its source changes,
However, at the moment, to make so will the price. 2018 2025 2030
a PtG system profitable is difficult, Larger scale cases In this instance, the LCOX of 25 years 8.15 4.65 3.00
but there is a lot of room for further economic study focused on one 1MW LCOX of 20 years 8.38 4.80 3.09
investigation to explore the real plant. On a larger scale, we would see
potential of this technology, especially greater results. LCOX of 15 years 8.81 5.07 3.26
as the Chinese energy environment Additional value in other scenarios LCOX of 10 years 9.74 5.66 3.62
becomes more and more open and Macro-integration scenarios, as
market-oriented. described earlier, promise additional
Besides, the high CAPEX and O&M service value. They have not been
cost as invested in the pilot PtG project quantified at this stage. With more Acknowledgements
could be reduced with technological energy reformation policies coming
developments in future. out, we can learn more about feasible The author wishes to acknowledge ASERI for the
opportunity to lead the research at this phase of
integration models in the future. the project and the PtG team for their support, and
Future work Project construction Once the pilot also wishes to acknowledge Shanghai Hydrogen
For future research, there are still project in Chongming is complete, Utilisation Engineering Technology Research
Centre and Shanghai Petrol and Gas Trading Centre
plenty of interesting aspects to explore: more reliable support can be given to for data support.
CO₂ pricing The CO₂ price is help with the study.

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