Updates & Changelog

Accuracy pass across the high-value pages: corrected the residential battery-storage rule on the Federal Solar Tax Credit page (eligibility is a minimum 3 kWh capacity, not a 75%-from-solar requirement) and clarified that the commercial Section 48E credit is a 6% base rate rising to 30% only with prevailing-wage and apprenticeship compliance; refreshed the Best EV Tariffs comparison (added EDF GoElectric at ~6.99p as the lowest headline rate, kept Intelligent Octopus Go at ~8p, and removed an out-of-date sub-7p claim); updated the Ofgem guide to the revised 2026 typical-consumption values (2,500 kWh electricity, 9,500 kWh gas) and the like-for-like bill comparison (~£1,663 to £1,723, a 4% rise); and replaced generic DOE Energy Saver links with claim-level EIA and ENERGY STAR sources, adding clickable citations on the tax, tariff and price-cap pages.

Corrected the Federal Solar Tax Credit page: removed the obsolete 2033–2035 step-down schedule so the whole page consistently reflects the residential credit (Section 25D) ending for systems placed in service after 31 December 2025. Refreshed the Best EV Tariffs UK guide to current supplier rates (Intelligent Octopus Go ~8p/kWh, E.ON Next Drive Smart ~8.5p, OVO Charge Anytime ~14p) and the October–December 2026 Ofgem price cap (26.32p/kWh).

Updated 13 external official-source links to their current URLs (US DOE Energy Saver, ENERGY STAR, FuelEconomy.gov, Ofgem) and switched the Canadian electricity-rate citations to the Canada Energy Regulator after Natural Resources Canada retired its old rates page.

Re-verified US and Australian electricity rates against the EIA (US, ~18.2¢/kWh) and AER/Canstar (Australia, ~33¢/kWh) and updated every rate-dependent calculator and worked example.

Corrected all US solar-incentive pages, calculators and guides to reflect the federal 30% solar and efficiency credits (Sections 25D/25C) ending for systems placed in service after 31 December 2025, distinguishing them from the continuing state and Home Energy Rebate programmes.

Added visible official-source links to the data studies, fixed a mobile header layout issue causing horizontal scroll on phones, refocused the "Electricity Prices by State" study on the US and UK, and connected the site to Google AdSense (meta tag + ads.txt).

Shortened page titles for search, expanded calculator FAQs, and published the "Heat Pump Running Costs UK" guide.

Corrected the Canadian national electricity-rate default to 14¢/kWh across the site and published two original data studies: "Electricity Prices by State & Region" and "What Appliances Use the Most Electricity".

Added embeddable versions of the calculators (for other sites to embed) and a site-wide country switcher (US/UK/CA/AU).

Launched Heat Pump vs Gas Furnace calculator, Electricity Bill Calculator, and EV Home Charging Cost calculator. Added category hub pages for Electricity, EV Charging, and Heating & Cooling. Added sitemap.xml.

Initial site launch. Deployed kWh Cost Calculator with US/UK/CA/AU rate support. Built all core PHP includes: config, header, footer, nav, seo, rates, formulas, and component partials.

All electricity and gas rate defaults set from official sources: EIA (US), Ofgem (UK), NRCan (CA), AER (AU). Rates verified April 2026.