Affinity Water (the UK’s largest water-only company) optimised their production and network investment options using Servelec Technologies’ PIONEER optimisation tool. The company area was considered as eight distinct ‘communities’. The investment plan was optimised to achieve service targets at least discounted cost both at community level and for the company as a whole. This resulted in reduced costs whilst making environmental improvements, tackling leakage and reducing customer interruptions.
At the 2014 Price Review in England & Wales, the economic regulator Ofwat (2013) gave water companies a challenging set of objectives in preparing their business plans. These included a major shift towards outcomes-based regulation, with all business plan investment requirements being justified on the basis of outcomes for customers and the environment, and with new Outcome Delivery Incentives required to incentivise delivery.
Companies who exceeded Ofwat expectations in their business plan submissions would be awarded ‘Enhanced Status’, which would mean that their business plans would be accepted substantially unchanged, without the need for further submissions. Of the nineteen water companies in England & Wales, Affinity Water was one of only two that achieved Enhanced Status (Ofwat, 2014). This case study assesses the reasons for their success, with particular focus on the planning of their investment programme using a portfolio optimisation approach.
Affinity Water is a vertically integrated water company providing water supply services to 3.6 million people in South East England.
The planning methodology applied was as follows (Figure 1):
1. The service and cost impacts of asset deterioration were forecast through a
combination of models implemented within PIONEER and external modelling tools from which results were imported. A wide range of service impacts were considered such as water quality, interruptions and leakage.
2. Emerging site-specific asset-related risks were identified and assessed manually, and quantified within PIONEER using the Asset Risk Management (ARM) interface.
3. Generic and site-specific intervention options were defined to address impacts due to 1 and 2 above.
4. Quality and supply-demand schemes were defined using the PIONEER Scheme Builder interface, to allow automatic calculation of capital and operational costs, and carbon emissions.
5. The PIONEER optimisation algorithm was applied to select the optimal set of
intervention options and schemes that will meet service measure targets at least cost.
The PIONEER optimiser allows multiple service and cost constraints to be applied in each planning timestep. Discounted costs are minimised across a user-defined planning horizon, taking account of capital costs, failurerelated
costs (e.g. repairs and compensation), other operational costs where modelled (e.g. pumping energy), and any modelled social and environmental costs.
The risk model applied takes account of:
All principal network and production asset types were assessed, with asset data arranged within a hierarchy structure as shown in Figure 3.
This approach represented a significant step forward from the previous price review (2009) where the frequency of renewal was assessed individually for each asset type, without any true optimisation across asset groups.
PIONEER is decision-support software for optimal asset management planning. The software has delivered benefits to clients over many years including:
PIONEER is comprised of:
The PIONEER ARM module provides Operational and Asset Managers with the means of capturing and assessing non-modelled asset-related risks, and of assessing and comparing the costs and benefits of potential solutions. PIONEER Scheme Builder provides Asset Managers with the means of quickly and easily creating, costing and assessing complex investment schemes. Both ARM ‘solutions’ and Scheme Builder ‘schemes’ can be considered alongside other intervention options within the PIONEER optimiser.
Affinity Water’s business plan (Affinity Water, 2013) delivers an integrated package of benefits:better managed assets by focusing maintenance
investment on service and risk, and reduced water use and waste whilst maintaining the quantity and quality of the water supply. This results in a better service overall, without extra risk being incurred by the company, the
customer or the environment.
The overall costs of providing services presented in the plan were lower than
those assessed by the Ofwat econometric modelling. This was at least partly due to the savings achieved by optimisation of the asset maintenance portfolio. This optimisation has enabled the company to achieve an improved balance between reactive and planned interventions, and between network and production investments. This reduced the total cost, whilst achieving the required regulatory performance commitments. Each of these performance commitments was aligned with the outcomes desired by Affinity’s customers (Figure 4).
Investment in each community is optimally balanced, taking into account the existing asset stock and future service requirements. Bills are set at the company level, but interventions are planned to ensure that service does not
deteriorate within each community, taking account of both previous investment and future issues.
In awarding Enhanced Status, Ofwat commended Affinity Water in a number of areas, including:
One of the key success factors in providing the confidence in the plan was the relative transparency and openness of PIONEER, enabling audit and board assurance. Integration of ‘business as usual’ by capturing operational risks using ARM and Scheme Builder to drive the investment programmes at concept stage
also meant that the operational teams were engaged. Refurbishment and repair options as well as replacement options, and the ability to link individual asset investments to service and customer outcomes, meant Affinity could
demonstrate the link between investments and what customers said they wanted. Another success factor was that the plan was deliverable; pipelines were replaced in sensible schemes and not short sections that had inflated cost-benefit; this meant that the final plan could easily be translated into an achievable delivery programme.
Future developments will include:
Affinity Water. December 2013. Our Business Plan for 2015-2020. Hatfield, UK.
Ofwat. July 2013. Setting price controls for 2015- 20 – final methodology and expectations for companies’ business plans. Birmingham, UK.
Ofwat. December 2014. Setting price controls for 2015-20, Final price control determination notice: company-specific appendix – Affinity Water. Birmingham, UK.
Allan Winkworth¹, Joseph Sanders², George Heywood³, Luke Hart⁴