by Wilson C. Chin

Received: 25 May 2026;  Published: 09 September 2026;  doi: 10.21926/jept.2603016

Understanding anisotropy in reservoir dynamics is essential to energy exploration, oilfield development and economic viability since this indicator describes the natural flow directions preferred by the underground fluid. Quantifying its effects allows oil companies to design drilling programs and production facilities that extract the greatest benefit from newly discovered resources. Formation testers are important because they provide direct clues on hydrocarbon properties and resistance to fl [...]

by Ovis D. Irefu  , Godslove I. Ebiega  , Terdoo M. Dugeri  and Seyi J. Fanifosi

Received: 29 April 2026;  Published: 26 August 2026;  doi: 10.21926/jept.2603015

Renewable energy systems play a critical role in reducing carbon emissions and promoting energy sustainability. Conventional battery storage remains the dominant but problematic solution for intermittency management in off-grid renewable energy systems (RES), imposing high capital costs ($150-400/kWh for lithium-ion), short replacement cycles of 3-15 years, and significant environmental burdens from toxic material disposal barriers that are particularly acute in the remote and resource-limited c [...]

by Nathália Dias Araújo  , Patrísia de Oliveira Rodrigues  , Mariana Fornazier Borges  , Anderson Gabriel Corrêa  , Gabriela Ciribelli Santos Pompêu  , Milla Alves Baffi  and Daniel Pasquini

Received: 19 May 2026;  Published: 24 August 2026;  doi: 10.21926/jept.2603014

Organosolv pretreatment is an attractive approach to disrupt the recalcitrant structure of lignocellulosic biomass from agroindustrial wastes, aiming to facilitate its bioconversion into valuable bioproducts. This study investigated the ability of an ethanol/water (1:1 v/v) organosolv pretreatment to improve the enzymatic digestibility of sugarcane bagasse (SB), sugarcane straw (SS), corn straw (CS), and corn cob (CC) for the production of reducing sugars and monosaccharides, aiming at future ap [...]

by Daming Zhang

Received: 11 August 2026;  Published: 23 August 2026;  doi: 10.21926/jept.2603013

In this paper, a method for operating AC microgrids in both off-grid or standalone and grid-connected modes is proposed to minimize the use of energy storage by increasing the number of PV panels and curtailing their output power. When the intensity of daylight decreases, power is imported from the main grid through an AC/DC/AC converter or solid-state transformers in parallel to compensate for the shortage. By using a three-phase transformer in Δ-Y connection with Y’s neutral connected to its l [...]

by Francis Mafuratidze  , Hagreaves Kumba  , David Ndiyamba  and Ackson Gondo

Received: 27 January 2026;  Published: 08 July 2026;  doi: 10.21926/jept.2603012

Unreliable electricity supply remains a significant barrier to economic development in sub-Saharan Africa, with Zimbabwe experiencing acute load-shedding that disrupts residential, commercial, and industrial activity. This paper presents a techno-economic feasibility assessment of a mini wind turbine for distributed urban energy generation in Zvishavane, Zimbabwe. Wind resource data were sourced from two independent platforms Weather Spark (30-year climatological record) and Meteoblue (high-reso [...]