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The paper guides three scenarios of power planning for Vietnam for the 2018–2030 period under CO2 emission targets. The analysis employs a model of energy expansion in the form of an optimization problem with the objective of the discounted entire system cost minimization. With each CO2 emission allowance, a scenario of the newly installed capacity structure will be carried out. The results indicate that instead of 42.6% coal-fired installed capacity as indicated in the National Power Development Master Plan for the 2011–2020 period with the Vision to 2030 (known as PDP VII), by 2030 the share of this power source will be around 29% (8% CO2 reduction scenario) and 19% (25% CO2 reduction scenario). Also, the lower emission sources such as hydro, wind, and solar power will be a priority for investment in the next decade. There is an existence of coal-fired power plants replacement by natural gas stations. Keywords: Power planning, Optimization problem, CO2 reduction target

It has been widely agreed that to incentivize renewables integration into the power system, not only pricing mechanisms, but price adjustment mechanisms have played a vital role, and it has been true for the German Energiewende. This study is to carry out a detailed analysis of investment results influenced by innovative price adjustment mechanisms from an auto degression rate to a feedback system. Employing linear regression models for the historical data of investment in small-scale rooftop PV projects in Germany, we have found out a better correlation between PV system price and feed-in tariff (92.09%) under quarter feedback and monthly adjustment mechanism compared to an annual feedback system. However, the underinvestment in recent years reveals that a feedback mechanism without specific mathematical shapes was not effective enough in term of meeting the targeted volume. Therefore, further researches are to design mathematical images of feedback mechanism in order to find out the trajectory of electricity price in the future which at the same time satisfies the target of investment and economic effectiveness.