historical review of demand side management in china management content operation mode results assessment and relative incentives abstract traditional power load management in china is featured by power rationing without considering user demand however since the 1990s demand side management dsm has been introduced by local governments and enterprises in china to improve terminal power efficiency and optimize resources allocation and certain breakthrough have already been achieved demand response aims at improving the energy efficiency of end users and achieving emission reduction targets based on the development status of power industry and electricity market in china this paper firstly reviews the three key development stages of traditional dsm including management content operation mode and results assessment secondly this paper analyzes the demand side management aimed at energy conservation and emissions reduction selecting the core elements and key processes influencing terminal power efficiency of dsm development in addition dsm safeguard system and incentive mechanism including political economic technical and managerial measures are further discussed to achieve the aim of energy conservation and emission reduction finally this paper systematically analyzes related policies and regulations proposed by the government and put forward relative policy recommendations for dsm development in china

peak oil and energy policy a critique energy policy has frequently been based upon assumptions about future oil prices at the end of the 1970s it was assumed oil prices would continue to rise now a similar assumption pervades policy design this article critiques the peak oil hypotheses which lie behind these forecasts and policy beliefs and considers that from a climate change perspective the challenge is too much not too little fossil fuel reserves the coming of shale gas its fungibility with oil via the electrification of transport along with technological advances in increasing the depletion rates of existing wells and new reserves together undermine that assumption that rising oil prices will rapidly make renewable and other low carbon technologies cost competitive without subsidies the paper suggests indexing carbon prices to the oil price infrastructure investment strategic storage and a focus on market failures provides a superior approach to energy policy rather than relying on forecasts of oil prices and picking winners

government failure rent seeking and capture the design of climate change policy climate change has been described as one of the biggest market failures less attention has been paid to the government failures associated with interventions and the implications for the design of climate change policy this paper sets out the main types of government failure and shows how the processes of rent seeking and capture help to explain both why the choice of targets and instruments has been so inefficient and also why the resulting costs of carbon mitigation are likely to be considerably higher than the estimates provided by the stern review and other recent studies two examples are given emissions trading and renewables policy a number of generic conclusions are drawn about how taking account of government failures can help to improve policy design and limit the impact of the climate change pork barrel which existing policies have created copyright 2010 oxford university press

oil price shocks and the macroeconomy this paper examines the impact of oil price shocks and attempts to explain why the rise in oil prices up to 2008 had little impact on the world economy it makes three main arguments first that oil prices have never been as important as is popularly thought second that the most important route through which oil prices affect output is monetary policy when oil prices pass through to core inflation monetary authorities raise interest rates slowing growth based on the second argument the third argument is that high oil prices have not reduced growth in recent years because they no longer pass through to core inflation so the monetary tightening previously seen in response to high oil prices is absent it also argues that oil prices had little impact on the global recession of 20089

residential peak electricity demand response highlights of some behavioural issues electricity demand response refers to consumer actions that change the utility load profile in a way that reduces costs or improves grid security the focus of demand response has mainly been on the commercial and big industrial sectors because of the large demand reduction that they can offer to the utility grid operators utilities are showing increasing interest in residential demand response rdr rdr can be treated as an energy resource which can be assessed and commercially developed however there are still some issues that remain to be addressed for rdr to be successful these include price unresponsiveness of some residential consumers equity issues and high cost of the metering infrastructure the aim of this paper is to investigate and present some of the challenges in achieving effective voluntary demand reduction based on a review of residential demand response literature as well as the general residential energy use behaviour literature the authors propose the use of a hybrid engineering approach using social psychology and economic behaviour models to overcome these challenges and realize the benefits of supply security and cost management

energy in a regional economy a computable general equilibrium model for california abstract this study presents a model of energy in the california economy and uses it to simulate long run impacts of oil price changes under varying assumptions about the structure of the economy the distinguishing feature of the model is flexibility use of generalized leontief flexible cost functions at the sectoral level captures the substitution effects of relative price changes while at the same time retaining the structure of traditional input output analysis experimental results suggest this innovation can be important a doubling of the price of imported oil leads to a much larger drop in oil use and a substantially smaller drop in aggregate consumption than is obtained with a fixed coefficient version of the model

economic performance of flexible functional forms a correction and comment in a recent article in the european economic review kostas a despotakis 1986 examines the properties of flexible functional forms applying the concept of the inner domain in the numerical experiments he unfortunately uses an incorrect form of the transcendental logarithmic function when the correct functional form is used his experimental results are always weakened and sometimes invalidated in particular the dinerences between the considered flexible functional forms are smaller than his experiments would suggest while the importance of dillerences in the elasticity of substitution is strengthened i introduction

scenario analysis on co2 emissions reduction potential in china s electricity sector abstract with the approach of the year 2012 a new round of international negotiations has energized the entire climate change community with this analyses on sector based emissions reduction and mitigation options will provide the necessary information to form the debate in order to assess the co2 emissions reduction potential of china s electricity sector this research employs three scenarios based on the long range energy alternative planning system leap model to simulate the different development paths in this sector the baseline scenario the current policy scenario and the new policy scenario seek to gradually increase the extent of industrial restructuring and technical advancement results imply that energy consumption and co2 emission in china s electricity sector will rise rapidly in all scenarios until 2030 triple or quadruple the 2000 level however through structural adjustment in china s electricity sector and through implementing technical mitigation measures various degrees of abatement can be achieved these reductions range from 85 to 350 million tons co2 per year figures that correspond to different degrees of cost and investment demand side management and circulating fluidized bed combustion cfbc ranked in order are employed prior to use to realize emissions reduction followed by supercritical plants and the renovation of conventional thermal power plants in the long term nuclear and hydropower will play the dominant role in contributing to emissions reduction it is also suggested that a self restraint reduction commitment should be employed to help contribute to the reduction of emission intensity an avenue that is more practical for china in light of its current development phase setting the year 2000 as the base year the intensity reduction target could possibly range from 4 2 to 19 4 dependent on the implementation effectiveness of various mitigation options

impact of policies and subsidies in agribusiness the case of oil palm and biofuels in colombia abstract we analyze the economic impacts of policies supporting biodiesel production in colombia such as subsidies and mandates for compulsory fuel mixtures in the major biodiesel source being palm oil we seek to establish the impact of these policies on oil palm producer incomes prices and production levels of crude palm oil cpo and biodiesel as well as the impacts on demand for land for oil palm plantation expansion we also calculate the so called deadweight costs to account for the social costs derived from the inefficiencies of government interventions in the biodiesel markets the analysis is done using a partial equilibrium models for the two interrelated sectors the production of palm oil and biodiesel and the demand for new land needed to cope with the additional palm oil needed the model was calibrated for 2009 to simulate for the 2010 2020 period the results of the simulations reveal that the subsidies alone are themselves not effective tools to achieve the government objectives defined in the biofuels program in colombia subsidies need to be complemented by increased blending mandates to ensure that palm cultivation and production of biodiesel investments are profitable enough that producers would bet on such business additionally we find that producers of palm oil benefit most from subsidies in the short term however in the long term it is the biodiesel entrepreneurs who will appropriate the larger share of growth revenue of the entire production chain the social costs of the biofuels program are small in the short term and represent only between 0 2 and 0 7 of the tax expenditure however in the long term they would become significant and would account for around 4 1 to 6 1 of the tax payers expense

capital energy substitution and the multi level ces production function abstract this paper has clarified a misconception in sato s multi level ces production function and used the function in testing for capital energy substitution in taiwanese manufacturing the empirical results show that capital and energy are substitutes and the aes estimates differ little from those derived from the translog approximation

distributed generation storage demand response and energy efficiency as alternatives to grid capacity enhancement the need for investment in capital intensive electricity networks is on the rise in many countries a major advantage of distributed resources is their potential for deferring investments in distribution network capacity however utilizing the full benefits of these resources requires addressing several technical economic and regulatory challenges a significant barrier pertains to the lack of an efficient market mechanism that enables this concept and also is consistent with business model of distribution companies under an unbundled power sector paradigm this paper proposes a market oriented approach termed as contract for deferral scheme cds the scheme outlines how an economically efficient portfolio of distributed generation storage demand response and energy efficiency can be integrated as network resources to reduce the need for grid capacity and defer demand driven network investments

analyzing the functional dynamics of technological innovation systems a scheme of analysis various researchers and policy analysts have made empirical studies of innovation systems in order to understand their current structure and trace their dynamics however policy makers often experience difficulties in extracting practical guidelines from studies of this kind in this paper we operationalize our previous work on a functional approach to analyzing innovation system dynamics into a practical scheme of analysis for policy makers the scheme is based on previous literature and our own experience in developing and applying functional thinking it can be used by policy makers not only to identify the key policy issues but also to set policy goals

electricity consumption and economic growth in china abstract this paper applies the error correction model to examine the causal relationship between electricity consumption and real gdp for china during 1971 2000 our estimation results indicate that real gdp and electricity consumption for china are cointegrated and there is unidirectional granger causality running from electricity consumption to real gdp but not vice versa in order to overcome the constraints on electricity consumption the chinese government has to speed up the nation wide interconnection of power networks to upgrade urban and rural distribution grids and to accelerate rural electrification

production and cost in the us paper and paperboard industry the us paper and paperboard industry has experienced significant structural changes over the past 25 years including reductions in the number of mills lower rates of capacity growth employment cutbacks and a loss of market share to foreign competitors these structural shifts portray an industry that increasingly has difficulty adapting to a more competitive global environment based on aggregate data from 1965 to 1996 this article estimates a short run translog tl cost function for the industry the estimated model fits the data well and all sample points satisfy monotonicity and concavity conditions at all points among the findings the industry operates at slightly increasing returns to capital utilization and labour and energy are allen uzawa complements but morishima substitutes in production technological progress generated 0 02 reduction in annual operating costs and consistent with an ailing us industry estimated marginal costs approximated average operating costs until 1982 after which

on grid electricity tariffs in china development reform and prospects abstract with the introduction of market oriented measures in china s power sector in the mid 1980s electricity sale prices to the grid companies on grid electricity tariffs became the focus of the energy industry thus affecting all related stakeholders including fuel suppliers power generators and end use consumers a number of changes have gradually been undertaken in terms of electricity tariff settings and their implementation to address specific requirements of the expansion of the power industry at each stage of its development on grid electricity tariffs had been used as a key lever to attract investment in power generation at an early stage of reform and then to encourage competition in the power industry in response to the rising concerns about environmental protection and the promotion of clean energy utilisation tariffs have progressively been developed for renewable electricity generation which has contributed to massive expansion of the renewable power industry in china this paper reviews key milestones of the development of on grid electricity tariffs in china examines the tariff setting mechanisms of coal fired power plants and renewable power generation analyses the factors associated with the adjustments of the tariff levels and discusses the options for further reform and more effective electricity pricing

clean energy and international oil oil has been the world s dominant fuel for more than 50 years substitution of oil for power generation and heating has progressed since the 1970s but substitution of oil in transport remains elusive this paper examines the progress of clean energy and compares the unfolding co evolution of technologies markets and institutions with what we know about substitution of oil and technological paradigm shifts while the rhetoric in favour of clean energy is strong technologies policies and supportive infrastructure investments are still in a formative stage the transformative process will evolve over the next 10 20 years and change irreversibly the demand dynamics for oil although decline in the demand for oil is not imminent the impact of the clean energy transition on international oil is evident even now high oil prices accelerate commitment policies and market prospects for clean energy options and speed up the market readiness of substitutes for oil while 20 years appears a long time for the development and scale up of alternatives to oil it is a short period in the context of the required paradigm shift for international oil it is well within the time frame for resource rent optimization strategic planning and investment decisions high cost resource developers need to be aware copyright 2011 oxford university press

technology policy and global warming why new policy models are needed or why putting new wine in old bottles won t work in recent years the threat of global climate change has come to be seen as one of the most serious confronting humanity to meet this challenge will require the development of new technologies and the substantial improvement of existing ones as well as ensuring their prompt and widespread deployment some have argued that the urgency of the situation requires a manhattan project or an apollo program this paper examines why such a policy model is inappropriate arguing that the nature of the policy context for confronting climate change necessitates a different kind of technology policy than that for building an atomic bomb or for achieving a manned lunar landing instead it seeks to draw lessons from three sectors that seem to be more pertinent and where government technological development and deployment programs have been pursued with some success in the united states namely agriculture biomedical research and information technology it compares and contrasts these with the policies pursued with regard to the first two of these sectors in the united kingdom the paper concludes by drawing out the implications for the design of policies supporting technological development and innovation to address the problem of global climate change

explaining the contract terms of energy performance contracting in china the importance of effective financing abstract energy service company esco uses energy performance contracting epc to provide energy saving services to its clients under an epc both esco and the client invest in the energy efficiency measures according to a negotiated share of investment within the length of the contract the esco and its client divide up the saved energy bill according to a negotiated share once the contract expires the client claims all of the saved energy bills if the energy efficiency measures still last different epc projects have different contract terms including total investment share of investment and length of contract these contract terms directly determine the resulted energy savings thus it is essential and important to look at how these contract terms are formed and what are the major influencing factors this paper first builds a theoretical bargain model between esco and its client to find out the structural relationship among these contract terms then using the information of about 140 epc contracts in china in 2010 and 2011 the paper empirically estimates the impacts of various factors on the contract terms and the resulted energy savings we find that cost of capitals for escos and the clients especially for escos is a major factor influencing contract terms and the resulted energy savings thus providing effective financing is critical for the development of epc in china

escaping carbon lock in this article explores the climate policy implications of the arguments made in understanding carbon lock in unruh 2000 which posited that industrial countries have become locked into fossil fuel based energy systems through path dependent processes driven by increasing returns to scale carbon lock in arises through technological organizational social and institutional co evolution culminating in what was termed as techno institutional complex tic in order to resolve the climate problem an escape from the lock in condition is required however due to the self referential nature of tic escape conditions are unlikely to be generated internally and it is argued here that exogenous forces are probably required

oil and international energy this article focuses on issues surrounding international oil markets within the wider context of international energy the global economy and conflicting agendas such as energy security and climate change it is suggested that important aspects of the current situation appear unsustainable increasing uncertainty and raising methodological difficulties for any assessment of likely future developments it is argued that the dynamics of oil prices during the 2002 9 cycle reflected great uncertainty about future fundamentals as well as the absence of previously anticipated stabilizing feedbacks from supply from demand or from policy it is suggested that damaging oil price swings could be moderated by better policy though probably not by financial regulation in the longer term the uncertainties remain very great especially since the tensions between a realist view of likely energy market developments and the imperatives of the climate change agenda remain unresolved a wide range of policies in producer and consumer countries are likely to affect not only oil prices but also the contentious issue of the distribution of rents within the industry copyright 2011 oxford university press

estimating and testing the compensated double log demand model in spite of the proliferation of flexible functional forms for consumer demand systems the double log demand model continues to be popular especially in applied work calling for single equation models it is usually estimated in uncompensated form it can also be estimated in compensated form by deflating the income variable alone using stone s price index the compensated form has the same right hand side as a single equation version of the popular linear approximation to the almost ideal demand model facilitating the construction of a test for choosing between the two alternatives this paper demonstrates these results develops the specification test and illustrates its application using us meat consumption data simulations suggest that the test is well behaved with good power in typical applications

regular flexibility of nested ces functions in this paper we define the class of regular flexible functional forms as the class of cost functions which are globally well behaved and can provide a local approximation to any globally well behaved cost function we then offer a constructive proof of flexibility for the nonseparable n stage constant elasticity of substitution functional form nnces by describing a technique through which the nnces form can be parameterized so as to locally capture any regular configuration of input demands and second order curvature conditions

on the choice offunctional forms in agricultural production analysis empirical results obtained by an analyst may depend on prior choice of functional form three alternative parametric specifications of the cost function are considered these are generalized leontief translog and normalized quadratic functions performance of these functional forms is evaluated by allen elasticities of substitution biases in technical change and some theory based hypotheses all three parametric specifications yielded mixed results together empirical results reinforce the need for model specification searches

policy redesign for solving the financial bottleneck in demand side management dsm in china abstract dsm is one of the best and most practical policy tools for china to balance environmental protection and economic growth however the bottleneck lies in the lack of long term stable sufficient and gradually increasing funds to flow into dsm projects the author redesigns the practical system benefit charge sbc policy which will provide long term and stable funding for dsm the policy to facilitate the financial support from banking sector and capital market and investigates the possibility of dsm funding from cdm projects sbc is the best way to boost long term stable and sufficient funding for dsm at present in china the current low inflation rate and natural resource price are favored to expedite the implementation of sbc and dsm developments with regard to the uneven development china needs to design relative policies to offset the impact in different areas such as tax reduction and fiscal subsides it is time for china to develop a definite and clear target and timetable to implement dsm which will give the public and enterprises a definite and clear expectation for the future the government should publicize a clear and integrated dsm development plan and relative policy outline in the near medium and long term

a meta analysis of the price elasticity of gasoline demand a sur approach abstract automobile gasoline demand can be expressed as a multiplicative function of fuel efficiency mileage per car and car ownership this implies a linear relationship between the price elasticity of total fuel demand and the price elasticities of fuel efficiency mileage per car and car ownership in this meta analytical study we aim to investigate and explain the variation in empirical estimates of the price elasticity of gasoline demand a methodological novelty is that we use the linear relationship between the elasticities to develop a meta analytical estimation approach based on a seemingly unrelated regression sur model with cross equation restrictions this approach enables us to combine observations of different elasticities and thus increase our sample size furthermore it allows for a more detailed interpretation of our meta regression results the empirical results of the study demonstrate that the sur approach leads to more precise results i e lower standard errors than a standard meta analytical approach we find that with mean short run and long run price elasticities of 0 34 and 0 84 respectively the demand for gasoline is not very price sensitive both in the short and the long run the impact of a change in the gasoline price on demand is mainly driven by responses in fuel efficiency and mileage per car and to a slightly lesser degree by changes in car ownership furthermore we find that study characteristics relating to the geographic area studied the year of the study the type of data used the time horizon and the functional specification of the demand equation have a significant impact on the estimated value of the price elasticity of gasoline demand

a new global deal on climate change a global target of stabilizing greenhouse gas concentrations at between 450 and 550 parts per million carbon dioxide equivalent ppm co2e has proven robust to recent developments in the science and economics of climate change retrospective analysis of the stern review 2007 suggests that the risks were underestimated indicating a stabilization target closer to 450 ppm co2e climate policy at the international level is now moving rapidly towards agreeing an emissions pathway and distributing responsibilities between countries a feasible framework can be constructed in which each country takes on its own responsibilities and targets based on a shared understanding of the risks and the need for action and collaboration on climate change the global deal should contain six key features i a pathway to achieve the world target of 50 per cent reductions by 2050 where rich countries contribute at least 75 per cent of the reductions ii global emissions trading to reduce costs iii reform of the clean development mechanism to scale up emission reductions on a sectoral or benchmark level iv scaling up of rd v an agreement on deforestation and vi adaptation finance

a review on implementation strategies for demand side management dsm in kuwait through incentive based demand response programs abstract since the export of fossil fuel is the backbone of kuwait s economy the enormous upsurge in the internal fuel consumption creates anguish and bane at present 46 of the internal fossil fuel consumption is used for electricity generation the increase in fuel consumption hurled kuwait as one of the highest per capita electricity consuming as well as co 2 emitting countries in the world consumers pay only 6 of the production cost of electricity the government subsidizes the balance which is one of the major reasons behind the high electricity consumption in the country any reduction in electricity consumption can positively reflect on both per capita electricity consumption and co 2 emission additionally the saved fossil fuel can be exported to generate revenue to support the country s economy worldwide demand side management dsm is considered as an effective tool to curtail electricity demand the objective of this review paper is to explore the available literature to find out the most suitable dsm measures to control the growth of per capita electricity consumption in kuwait after conducting a detailed strengths weaknesses opportunities and threats swot analysis it is concluded that incentive based demand response programs can be considered as one of the most suitable solutions to address this problem

economic performance of flexible functional forms flexible functional forms are well behaved over restricted regions the outer domain and constitute good approximations of a hypothetical true technology set of preferences over only a subregion of the outer domain the inner domain comparison of such forms has been made in terms of outer domain ideally il should also cover the inner domain by definition however the inner domain is unquantifiable instead functions representing producer technology consumer preferences can be characterized and compared in terms of what we call in this paper economic performance focusing on the producer side we demonstrate that relative differences and associated implications for equilibrium modeling can be substantial

demand side management in china the context of china s power industry reform abstract the reform of china s power industry has lasted for decades while the implementation of demand side management dsm in china is still in its infancy in this paper we present a comprehensive study of the dsm and demand response dr programs in china under the context of china s power industry reform we first present a brief introduction of the background including the socio economic status and geographical location of china the energy policy of china china s power industry the smart grids and microgrid in china and the reform of china s power industry then based on the introduction of dsm and the analysis of dsm practices in some countries we discuss the development status of dsm and the reform of electricity pricing in china finally the main challenges in five aspects for the future development of dsm programs in china are proposed and discussed these challenges include customer understanding and participation advanced metering infrastructure ami and information and communication technology ict pricing mechanisms and optimal scheduling big data analytics based decision support as well as government regulations and market policies

measuring global gasoline and diesel price and income elasticities abstract price and income elasticities of transport fuel demand have numerous applications they help forecast increases in fuel consumption as countries get richer they help develop appropriate tax policies to curtail consumption help determine how the transport fuel mix might evolve and show the price response to a fuel disruption given their usefulness it is understandable why hundreds of studies have focused on measuring such elasticities for gasoline and diesel fuel consumption in this paper i focus my attention on price and income elasticities in the existing studies to see what can be learned from them i summarize the elasticities from these historical studies i use statistical analysis to investigate whether income and price elasticities seem to be constant across countries with different incomes and prices although income and price elasticities for gasoline and diesel fuel are not found to be the same at high and low incomes and at high and low prices patterns emerge that allow me to develop suggested price and income elasticities for gasoline and diesel demand for over one hundred countries i adjust these elasticities for recent fuel mix policies and suggest an agenda of future research topics

impact of cheaper oil on economic system and climate change a swot analysis abstract the drop in crude oil price by nearly half since june 2014 has created new opportunities as well as challenges this study employs the swot method to analyze the impact of cheaper oil on the global economic system and carbon emissions exploring the climatic opportunities and identifying the challenges of lower oil prices in addition it contends that falling oil prices boost economic growth but produce more carbon pollutants thereby accelerating global warming however cheaper oil has provided a window of opportunity to remove fossil fuel subsidies a major development that years of climate shaming has failed to achieve furthermore we argue that social factors are a critical often overlooked threat for the removal of fossil fuel subsidies with declining oil prices exerting downward pressure on gas and coal the removal of subsidies and carbon tax can be introduced without raising the energy prices four policy recommendations are proposed for the removal of fossil fuel subsidies to limit global warming as well as to meet the challenge and opportunity of cheaper oil removal of fossil fuel subsidies should be quickly implemented because this window of opportunity of cheaper oil will not last forever

a review of demand side management policy in the uk abstract demand side management dsm refers to actions undertaken on the demand side of energy metres a broad definition of dsm is proposed to include current policy objectives for emissions reduction energy security and affordability and encompasses energy efficiency demand response and on site back up generation and storage the paper reviews the concept of dsm outlines the historical impacts of dsm globally since the energy crises of the 1970s analyses uk dsm policy and examines the influence of eu directives on uk dsm policy as the country is currently deciding on how to include the demand side in its electricity market reform proposals and wider energy policy much of the focus of previous research has been on dsm technological trials and modelling studies rather than dsm policy and the paper contributes to filling this gap policy recommendations for the uk context are discussed and it is clear that the success of dsm policies is determined primarily by regulatory support and utility financial incentives it is important that policy clarity is provided and that current and new policies do not overlap

world crude oil and natural gas a demand and supply model abstract this paper examines world markets for crude oil and natural gas over the period 1918 1999 it analyzes the time series properties of output and prices and estimates demand and supply elasticities during 1918 1973 and 1973 1999 oil and gas prices were stable during the first period they became volatile afterwards reflecting deep changes in the market structure following the oil shock in 1973 demand price elasticities were too low however demand income elasticities were high supply price elasticities were also too low the elasticity estimates help to explain the market power of the oil producers and price volatility in response to shocks and corroborate elasticity estimates in energy studies

evolutionary approaches for sustainable innovation policies from niche to paradigm fostering technological innovation is considered as an important element of policies towards sustainable development in the past 10 years evolutionary policy approaches have been increasingly advocated for several reasons they seem well equipped to underpin sustainable innovation policies they focus on dynamics of change and their drivers they allow for a substantive perspective on technologies beyond mere input output relations taking into account trajectories and different characteristics of innovation and they are able to describe circumstances under which established technologies might persist even when they are to some extent inferior to their new competitors lock in however the policy effectiveness of evolutionary approaches in cases in which radical or systemic changes are involved is not yet proven in this paper we assess the theoretical rationale instrumental aspects and the coping with policy constraints of three evolutionary policy approaches which have also been used in empirical studies strategic niche management transition management and time strategies each approach has its strengths and specific problems and all three have to be further developed and tested out but they hold promise for contributing to non incremental change with economic and environmental benefits by shaping processes of variation selection and retention with the outcomes feeding back into policy they may also be used in other areas in which innovation direction is important for instance health care or food