Separate the energy price from the whole bill
Wholesale pool prices are not the final retail bill. Compare energy and contracted-power charges, taxes, metering, service fees, renewal terms and exit conditions. Use the same measured consumption and time periods for each offer. Neither a supplier name nor a claimed discount establishes the cheapest contract for a particular household.
Compare suppliers without a ranking
Endesa, Iberdrola, Octopus Energy and Energy Nordic are examples to investigate, not an endorsement or an up-to-date offer list. Request dated contractual prices and written confirmation of any language support, surplus product, management fee and switching responsibility. Use the CNMC comparator where applicable and verify the contract before signing.
Read the surplus-compensation contract
Under simplified compensation, exported energy and imported energy are accounted for separately within the applicable billing arrangement; the credit is limited by the eligible imported-energy value. It does not automatically remove all fixed charges or taxes. A retailer's virtual-credit product has separate terms and is not a physical battery or a universal net-metering entitlement.
Check time periods and switching terms
Obtain the actual time schedule, unit prices, fixed charges and revision method for the offer. Include any service subscription, exit fee and surplus-credit conditions. Confirm who requests the change and what happens to an existing export contract. Do not assume a universal off-peak saving or guaranteed support language.
Start with measured demand
Use interval electricity data and distinguish space heating, hot water, cooling, pool circulation and other loads. State occupancy and seasonal changes. A floor area, bedroom count or annual bill alone cannot establish the right inverter, battery or heat-pump size. Check supply capacity, phases, starting loads and simultaneous operation before specifying equipment.
Make financial assumptions explicit
Compare the actual installed quote with interval self-consumption, imports, exports, contracted prices and applicable credit limits. Include losses, fixed charges that remain, maintenance, replacement, finance and taxes. Treat incentives as conditional until their applicable requirements and, where required, award decisions are established. A simple cost divided by annual benefit is not a forecast or a guaranteed payback.
Documents and reference links
Check the current version and applicability. These links do not establish failure rates, LIT credentials or an outcome for your property.
Company contact
Ben HaydenPrepare for a useful assessment
Provide the location, objectives, existing models, plans or safely taken photos, and measured demand. Confirm scope, availability, assessment fees and responsibilities before booking.